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Tightness and sweet spot formation in moldic-pore-type dolomite reservoirs: The middle Ordovician Majiagou Formation in the eastern Ordos Basin, central China

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petroleum 2019年第4期5卷 341-351页

作者： Tong Niu Kai Hu Di Xiao Xing Gao Juanping Chen Jian Cao MOE Key Laboratory of Surficial Geochemistry School of Earth Sciences and EngineeringNanjing UniversityNanjing210023China Research Institute of petroleum Exploration and Development PetroChina Changqing Oilfield CompanyXi'an710018China

The diagenetic evolution of the moldic-pore-containing gypsum dolomites of the Middle Ordovician Majiagou Formation in the eastern Ordos Basin,central China,was studied by means of petrological,mineralogical,and geochemical analyses,to improve our understanding of heterogeneity in high-quality *** aim of the study was to elucidate the processes that resulted in reservoir tightness and the formation of sweet spots,to guide future *** show that the moldic-pore-containing gypsum dolomites are the most favorable reservoir in the study area,with a mean porosity of 4.96%and a mean permeability of 0.748 *** development and preservation of gypsum moldic pores were the main factors causing reservoir ***,moldic pore development was controlled by the sedimentary microfacies,whereas pore preservation was related to dissolution and filling during telogenetic *** were three main dissolution-filling stages that took place in three settings:penecontemporaneous,epigenetic,and *** processes controlled the formation of reservoir sweet ***-consolidated dolomite deposits were frequently exposed to the atmosphere in the penecontemporaneous environment under the influence of high-frequency sedimentary cycles,which led to the dissolution of evaporite minerals and consequent formation of gypsum moldic pores,accompanied by infilling by freshwater *** epigenesis,the porosity initially increased due to karstification,then significantly decreased because of calcite infilling resulting from long subaerial exposure(120 Myr),which contributed to reservoir ***,during burial the high-temperature and high-pressure conditions led to chemical compaction and continuous tightening of the reservoir,although some burial dissolution also took *** conclusion,the variable paleo-topography resulted in differences in the intensity of pore filling among the blocks in the study area,resulting in re

关键词： Dolomite Tight carbonate rock Gypsum moldic pores Dissolution Middle Ordovician Majiagou Formation Ordos Basin

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Geomorphological evidence inconvenient for the antecedent rivers of the Arun and Tista across the Himalayan range

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Journal of Mountain Science 2024年第9期21卷 3001-3017页

作者： NAKATA Takashi KUMAHARA Yasuhiro NAIK Sambit Prasanajit SAKAI Harutaka Graduate School of Humanities and Social sciences Hiroshima UniversityHigashi-Hiroshima 739-8522Japan Active Fault and earthquake Hazard Mitigation Research Center Pukyong National UniversityBusan 48513South Korea Department of petroleum engineering and earth sciences University of Petroleum and Energy StudiesDehradun 248007India Graduate School of Science Kyoto UniversityKyoto 606-8502Japan

The Arun and Tista Rivers,which flow across the Himalayas,are commonly known as antecedent valleys that overcame the rapid uplift of the Higher Himalayan *** clarify whether the idea of antecedent rivers is acceptable,we investigated the geomorphology of the Himalayas between eastern Nepal and Bhutan *** southern part of Tibetan Plateau,extending across the Himalayas as tectonically un-deformed glaciated terrain named as'Tibetan Corridor,'does not suggest the regional uplift of the Higher *** 8,000-m class mountains of Everest,Makalu,and Kanchenjunga are isolated residual peaks on the glaciated terrain composed of mountain peaks of 4,000–6,000 m *** Tibetan glaciers commonly beheaded by Himalayan glaciers along the great watershed of the Himalayas suggest the expansion of Himalayan river drainage by *** the narrow upstream regions of the Arun and Tista Rivers with less precipitation behind the range,it is hard to collect enough water for the power of down-cutting their channels against the uplifting *** fission track ages of the Higher Himalayan Crystalline Nappe suggest that the Himalayas attained their present altitude by 11–10 Ma,and the Arun and Tista Rivers formed deep gorges across the Himalayas by headward erosion.

关键词： Himalaya Antecedent river Geomorphology AW3D30 DSM Glacier piracy

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Experimental study of hydraulic fracture propagation with multi-cluster in-plane perforations in a horizontal well

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petroleum Science 2024年第5期21卷 3258-3270页

作者： Xian Shi Yuan-Yuan Yang Xiang-Wei Kong Qi Gao Shu Jiang Hai-Jun Mao College of petroleum engineering China University of Petroleum(East China)Qingdao266580ShandongPR China State Key Laboratory of Deep Oil and Gas China University of Petroleum(East China)Qingdao266580ShandongPR China School of petroleum engineering Yangtze UniversityWuhan430100HubeiPR China Key Laboratory of Drilling and Production engineering for Oil and Gas Wuhan430100HubeiPR China School of engineering The University of Western AustraliaPerthWA6009Australia Key Laboratory of Tectonics and petroleum Resources of Ministry of Education School of Earth ResourcesChina University of GeosciencesWuhan430074HubeiPR China State Key Laboratory of Geomechanics and Geotechnical engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071HubeiPR China

Tri-axial fracturing studies were carried out to understand the impact of lateral mechanical parameters on fracture propagation from multiple in-plane perforations in horizontal wells. Additionally, the discussion covered the effects of geology, treatment, and perforation characteristics on the non-planar propagation behavior. According to experimental findings, two parallel transverse fractures can be successfully initiated from in-plane perforation clusters in the horizontal well because of the in-plane perforation, the guide nonuniform fishbone structure fracture propagation still can be exhibited. The emergence of transverse fractures and axial fractures combined as complex fractures under low horizontal principal stress difference and large pump rate conditions. The injection pressure was also investigated, and the largest breakdown pressure can be also found for samples under these *** increase in perforation number or decrease in the cluster spacing could provide more chances to increase the complexity of the target stimulated zone, thus affecting the pressure fluctuation. In a contrast, the increase in fracturing fluid viscosity can reduce the multiple fracture complexity. The fracture propagation is significantly affected by the change in the rock mechanical properties. The fracture geometry in the high brittle zone seems to be complicated and tends to induce fracture reorientation from the weak-brittle zone. The stress shadow effect can be used to explain the fracture attraction, branch, connection, and repulsion in the multiple perforation clusters for the horizontal *** increase in the rock heterogeneity can enhance the stress shadow effect, resulting in more complex fracture geometry. In addition, the variable density perforation and temporary plugging fracturing were also conducted, demonstrating higher likelihood for non-uniform multiple fracture propagation. Thus, to increase the perforation efficiency along the horizontal well, it is

关键词： Heterogeneous rock In-plane perforation Stress shadowing Tri-axial fracturing Multiple perforation clusters

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Hydrocarbon expulsion model and resource potential evaluation of high-maturity marine source rocks in deep basins:Example from the Ediacaran microbial dolomite in the Sichuan Basin,China

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petroleum Science 2022年第6期19卷 2618-2630页

作者： Wen-Yang Wang Xiong-Qi Pang Ya-Ping Wang Zhang-Xin Chen Chang-Rong Li Xin-Hua Ma State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China State Key Laboratory of petroleum Resources and Prospecting China University of Petroleum(Beijing)Beijing 102249China College of Geosciences China University of Petroleum(Beijing)Beijing 102249China Research Institute of Exploration and Development Petro China Southwest Oil&Gas Field CompanyChengduSichuan 610041China Chemical and petroleum engineering Schulich School of EngineeringUniversity of CalgaryCalgary T2N 1N4Canada School of earth and Space sciences Peking UniversityBeijing 100871China Research Institute of petroleum Exploration and Development(RIPED) Petro ChinaBeijing 100083China

Hydrocarbon expulsion features and resource potential evaluation of source rocks are crucial for the petroleum ***-maturity marine source rocks have not exhibited a hydrocarbon expulsion mode owing to the lack of low-maturity source rocks in deep petroliferous *** considered the Ediacaran microbial dolomite in the Sichuan Basin,the largest high-maturity marine gas layer in China,to exhibit a method that quantitatively characterizes the hydrocarbon expulsion of high-maturity marine source *** experiment of fluid inclusion,rock pyrolysis,and vitrinite reflectance(Ro)of 119 microbial dolomite core samples obtained from the Dengying Formation were performed.A hydrocarbon expulsion model of high-maturity source rock was established,and its resource potential was *** results showed that the Ediacaran microbial dolomite in the Sichuan Basin is a good source rock showing vast resource *** hydrocarbon expulsion threshold is determined to be vitrinite reflectance at 0.92%.The hydrocarbon expulsion intensities in the geologic history is high with maximum of 1.6×10^(7)t/km^(2).The Ediacaran microbial dolomite expelled approximately 1.008×10^(12)t of hydrocarbons,and the recoverable resource was 1.5×10^(12)m^(3).The region can be categorized into areasⅠ,Ⅱ,Ⅲ,andⅣ,in decreasing order of hydrocarbon expulsion *** with a higher hydrocarbon expulsion intensity have a lower drilling risk and should be prioritized for exploration in the orderⅠ>Ⅱ>Ⅲ>Ⅳ.Two areas,northern and central parts of Ediacaran in the Sichuan Basin,were selected as prospects which had the drilling priority in the future gas *** production data of 55 drilled wells verified the high reliability of this *** model in this study does not require low-maturity samples and can be used for evaluating high-maturity marine source rocks,which has broad applicability in deep basins worldwide.

关键词： Deep petroliferous basin Overmatured source rocks Hydrocarbon expulsion model Resource evaluation Sichuan basin

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Fracture network characterisation of the Balmuccia peridotite using drone-based photogrammetry,implications for active-seismic site survey for scientific drilling

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Journal of Rock Mechanics and Geotechnical engineering 2024年第10期16卷 3961-3981页

作者： Niccolo Menegoni Yuri Panara Andrew Greenwood Davide Mariani Alberto Zanetti Gyorgy Hetenyi Ali I.Al-Naimi petroleum engineering Research Center King Abdullah University of Science and TechnologyThuwal23955-6900Saudi Arabia Chair of Applied Geophysics Montanuniversit€at LeobenLeobenAustria Department of earth and Environmental sciences University of PaviaPaviaItaly Institute of Geosciences and earth Resources National Research Council(IGG-CNR)PaviaItaly Institute of earth sciences University of Lausanne1015LausanneSwitzerland

The presence of discontinuities(***,fractures,veins,layering)in crystalline rocks can be challenging for seismic interpretations because the wide range of their size,orientation,and intensity,which controls the mechanical properties of the rock and elastic wave propagation,resulting in equally varying seismic responses at different *** geometrical characterisation of adjacent outcrop discontinuity networks allows a better understanding of the nature of the subsurface rocks and aids seismic *** this study,we characterise the discontinuity network of the Balmuccia peridotite(BP)in the IvreaeVerbano Zone(IVZ),northwestern *** geological body is the focus of the Drilling the Ivrea eVerbano zonE(DIVE),an international continental scientific drilling project,and two active seismic surveys,SEismic imaging of the Ivrea ZonE(SEIZE)and high-resolution SEIZE(Hi-SEIZE),which aim to resolve the subsurface structure of the DIVE drilling target through high-resolution seismic *** fracture characterisation,we developed two drone-based digital outcrop models(DOMs)at two different resolutions(10^(-3)-10 m and 10^(-1)-10^(3)m),which allowed us to quantitatively characterise the orientation,size,and intensity of the main rock *** properties affect the seismic velocity and consequently the interpretation of the seismic *** found that(i)the outcropping BP discontinuity network is represented by three more sets of fractures with respect to those reported in the literature;(ii)the discontinuity sizes follow a power-law distribution,indicating similarity across scales,and(iii)discontinuity intensity is not uniformly distributed along the *** results help to explain the seismic behaviour of the BP detected by the SEIZE survey,suggesting that the low P-wave velocities observed can be related to the discontinuity network,and provide the basic topological parameters(orientation,density,distribution,and aperture)of the frac

关键词： Remote sensing Fracture intensity Digital outcrop model(DOM) Rock discontinuity Fault SEismic imaging of the Ivrea ZonE(SEIZE) IvreaeVerbano Zone(IVZ) Crystalline rock

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Hydrocarbon Generation Potential and Organic Matter Enrichment Mechanism of the Cambrian Marine Shale in the Tadong Low Uplift,Tarim Basin

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Acta Geologica Sinica(English Edition) 2024年第5期98卷 1301-1321页

作者： MIAO Huan WANG Yanbin JIANG Zhenxue ZHAO Shihu SHANG Peng GONG Xun TAO Chuanqi ZHANG Yu State Key Laboratory of petroleum Resources and engineering China University of PetroleumBeijing 102249China Unconventional Unconventional petroleum Research Institute Research Institute China University of PetroleumBeijing 102249China College of Geoscience and Surveying engineering China University of Mining and TechnologyBeijing 100083China petroleum Exploration and Production Research Institute SINOPECBeijing 102206China Second Gas Production Plant PetroChina Changqing Oilfield CompanyYulinShaanxi 719000China School of earth and Space sciences Peking UniversityBeijing 100871China School of Civil engineering Liaoning Petrochemical UniversityFushunLiaoning 113001China

Cambrian shales in China and elsewhere contain abundant oil and gas ***,due to its deep burial and limited outcrop,there has been relatively little research conducted on *** Cambrian shale of the Tadong low uplift in the Tarim Basin of western China,specifically the Xidashan-Xishanbulake Formation(Fm.)and overlying Moheershan *** a case study through the use of organic petrology,mineralogy,organic and elemental geochemistry,with the aim of analyzing and exploring the hydrocarbon generation potential(PG)and organic matter(OM)enrichment mechanisms within these shale *** results indicate that:(1)the Cambrian shale of the Tadong low uplift exhibits relatively dispersed OM that consists of vitrinite-like macerals and solid *** formations have a higher content of quartz and are primarily composed of silica-based lithology;(2)shale samples from the Xidashan-Xishanbulake and Moheershan formations demonstrate high total organic carbon(TOC)and low pyrolytic hydrocarbon content(S_(2))*** OM is predominantly typeⅠand typeⅡkerogens,indicating a high level of maturation in the wet gas *** shales have undergone extensive hydrocarbon generation,showing characteristics of relatively poor PG;(3)the sedimentary environments of the Xidashan-Xishanbulake and Moheershan formations in the Tadong low uplift are *** were deposited in warm and humid climatic conditions,in oxygen-deficient environments,with stable terrigenous inputs,high paleoproductivity,high paleosalinity,weak water-holding capacity,and no significant hydrothermal activity;and(4)the relationship between TOC and the paleoproductivity parameter(P/Ti)is most significant in the Lower Cambrian Xidashan-Xishanbulake Fm.,whereas correlation with other indicators is not *** suggests a productivity-driven OM enrichment model,where input of landderived material was relatively small during the Middle Cambrian,and the ancient water exhibited lower salinity.

关键词： Conventional resources hydrocarbon generation potential geochemistry sedimentary environment enrichment mechanism organic matter Cambrian Tadong low uplift

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Distribution of Helium Resources in Weihe Basin,Central China:Insight from 3D Magnetic Inversion

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Journal of earth Science 2022年第4期33卷 977-992页

作者： Xuliang Feng Bingqiang Yuan Yuhong Li Chunguan Zhang Lijun Song School of earth sciences and engineering Xi'an Shiyou UniversityXi'an 710065China Shaanxi Key Laboratory of petroleum Accumulation Geology Xi'an Shiyou UniversityXi'an 710065China Xi'an Center China Geological SurveyXi'an 710054China

There is promising indication of helium-rich natural gas in Weihe ***,the lack of a detailed investigation on the origin and the spatial distribution of helium source rocks(mainly Yanshanian granites)limits the helium potentiality evaluation in Weihe Basin(WB).We performed three-dimensional(3 D)inversions of magnetic data in Weihe Basin and its adjacent areas to figure out the crustal thermal structure and the temporal-spatial distribution of deep granite in the *** on this,we have proposed a geological model of helium accumulation and predicted the potential area of helium *** results of 3 D magnetic inversion indicate that the granites in the deep Weihe Basin are mostly located at the central and southern parts of the basin,which are connected spatially with the granites in the North Qinling Orogenic *** granites were all derived from largescale intra-continental orogeny in the Qinling area during the mid-Mesozoic,providing a good material basis for crust-derived helium in the *** local uplift of the Curie surface makes the thermal fluid more actively,which contributes to helium *** faults developed in the WB are the migration pathway of crust-derived helium and the upward migration of the mantle-derived *** wells with high percentage helium are mostly located near the Weihe fault and the areas on the south of *** Wugong-Xi’an-Lantian area in the central and the Lintong-Weinan-Tongguan area in the eastern Weihe Basin are the most promising helium distribution ***,the region from the north of Taibai Mountain to Baoji City in the western Weihe Basin may also be another potential area of Helium resource.

关键词： Weihe Basin helium accumulation magnetic anomaly three-dimensional inversion Curie point depth

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Raman Micro-Imaging of the Coexistence of sⅠ and sⅡ Hydrates Formed from a Mixed Methane-Propane Gas in a Confined Space

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Acta Geologica Sinica(English Edition) 2022年第2期96卷 674-679页

作者： CAI Wenjiu ZHAN Linsen HUANG Xin LU Hailong College of engineering Peking UniversityBeijing 100871China Beijing International Center for Gas Hydrate School of Earth and Space SciencesPeking UniversityBeijing 100871China SINOPEC petroleum Exploration and Production Research Institute Beijing 100083China

Natural gas hydrate contains a specific amount of heavy hydrocarbons, such as ethane, propane, etc., aside from the primary guest gas of methane. Although the coexistence of two or even three hydrate structures has been discovered at several hydrate sites, the requisite formation mechanism is still not well understood. In-situ observation of the formation process of mixed methane-propane hydrate in a confined space was conducted using confocal Raman imaging microscopy. The Raman imaging results reveal that sI methane hydrate and sII mixed methane-propane hydrate are formed and coexist in the reaction system. In the confined space, the sI hydrate originates from the dissolved gas in water, while the sII hydrate is formed from free gas. The results obtained can help explain the coexistence of sI and sII hydrates found in natural hydrate samples, as well as providing insights into a possible dynamic scenario of hydrate reservoirs in geological history.

关键词： Raman imaging mixed hydrate coexistence sⅠhydrate sⅡhydrate

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Stratigraphy of the Triassic-Jurassic Boundary Successions of the Southern Margin of the Junggar Basin,Northwestern China

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Acta Geologica Sinica(English Edition) 2011年第2期85卷 421-436页

作者： SHA Jingeng Vivi VAJDA PAN Yanhong Linda LARSSON YAO Xiaogang ZHANG Xiaolin WANG Yaqiong CHENG Xiansheng JIANG Baoyu DENG Shenghui CHEN Siwei PENG Bo State Key Laboratory of Palaeobiology and Stratigraphy Nanjing Institute of Geology and Palaeontology the Chinese Academy of Sciences Nanjing 210008 China Department of earth and Ecosystem sciences Lund University 22362 Lund Sweden PetroChina Xinjiang Oil Field Company Keramay 834000 China School of earth sciences and engineering Nanjing University Nanjing 210093 China Research Institute of petroleum of Exploration and Development PetroChina Beijing 100083 China

The Triassic-Jurassic （Tr-J） boundary marks a major extinction event, which （～200 Ma）resulted in global extinctions of fauna and flora both in the marine and terrestrial realms. There prevail great challenges in determining the exact location of the terrestrial Tr-J boundary, because of endemism of taxa and the scarcity of fossils in terrestrial settings leading to difficulties in linking marine and terrestrial sedimentary successions. Investigation based on palynology and bivalves has been carried out over a 1113 m thick section, which is subdivided into 132 beds, along the Haojiagou valley on the southern margin of the Junggar Basin of the northern Xinjiang, northwestern China. The terrestrial Lower Jurassic is conformably resting on the Upper Triassic strata. The Upper Triassic covers the Huangshanjie Formation overlaid by the Haojiagou Formation, while the Lower Jurassic comprises the Badaowan Formation followed by the Sangonghe Formation. Fifty six pollen and spore taxa and one algal taxon were identified from the sediments. Based on the key-species and abundance of spores and pollen, three zones were erected： the Late Triassic （Rhaetian） Aratrisporites-Alisporites Assemblage, the Early Jurassic （Hettangian） Perinopollenites-Pinuspollenites Assemblage, and the Sinemurian Perinopollenites-Cycadopites Assemblage. The Tr-J boundary is placed between bed 44and 45 coincident with the boundary between the Haojiagou and Badaowan formations. Beds with Ferganoconcha （？）, Unio-Ferganoconcha and Waagenoperna-Yananoconcha bivalve assemblages are recognized. The Ferganoconcha （？） bed is limited to the upper Haojiagou Formation,Unio- Ferganoconcha and Waagenoperna- Yananoconcha assemblages are present in the middle and upper members of the Badaowan Formation. The sedimentary succession is interpreted as terrestrial with two mainly lake deposit intervals within Haojiagou and Badaowan formations, yielding fresh water algae and bivalves. However, the presence of brackish water

关键词： Biostratigrapy Triassic-Jurassic Hettangian-Sinemurian palynology bivalve Haojiagou of Junggar Basin northwestern China

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Multi-Frequency Contrast Source Inversion for Reflection Seismic Data

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Communications in Computational Physics 2020年第6期28卷 207-227页

作者： Shoudong Wang Ru-Shan Wu State Key Laboratory of petroleum Resources and Prospecting China University of Petroleum(Beijing)Beijing 102249P.R.China National engineering Laboratory of Offshore Oil Exploration China University of Petroleum(Beijing)Beijing 102249P.R.China Modeling and Imaging Laboratory Earth and Planetary SciencesUniversity of CaliforniaSanta CruzCA 95064USA

In the contrast source inversion(CSI)method,the contrast sources(equiva-lent scattering sources)and the contrast(parameter perturbation)are iteratively recon-structed by an alternating optimization *** integral equation CSI method is formulated for transmission tomography using analytic Green’s function in homogeneous *** extend the method to the case of reflection seismology,in this paper,we use WKBJ method to compute the Green’s function of depth dependent background media and the solving method of equations to initialize the contrast source of different frequencies,resulting in an efficient method to invert multi-frequency reflection seismic data–multi-frequency contrast source inversion method(MFCSI).Numerical results for the Marmousi model show that MFCSI method can obtain good results even when low frequency data are missing,in which case the conventional FWI fails.

关键词： Contrast source inversion full waveform inversion frequency domain inversion integral equation CSI

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