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Formation mechanism of deep natural hydrogen in the Sichuan Basin

Science China earth sciences 2025年

作者： Xiaomei WANG Kun HE Chunlong YANG Hao XIE Xiaobo WANG Yitong LYU Linfeng XIE Shuichang ZHANG Research Institute of petroleum Exploration & Development PetroChina Key Laboratory of petroleum Geochemistry China National Petroleum Corporation International Center for Isotope Effects Research School of Earth Science and Engineering Nanjing University

As a potential renewable and clean energy source,the distribution and exploration prospects of natural hydrogen have garnered widespread ***,the limitations in understanding the formation mechanisms and accumulation patterns of underground natural hydrogen have significantly constrained its efficient exploration and *** study reports H2content and isotopes in natural gas from deep formations in sedimentary basins through geochemical analysis of 58 conventional gas samples from the Sinian to Triassic strata in the central Sichuan *** discovered that H2content in deep natural gas in central Sichuan generally exceeds 0.1%,with a maximum of 1.6%,and hydrogen isotopes (δ2HH2) range from-850‰to-586‰.Analysis of the geological conditions,hydrogen generation mechanisms,and isotope fractionation characteristics in the study area confirms that microbial fermentation or in-situ organic matter cracking are not effective pathways for deep *** with helium content and isotope analysis of the natural gas,it is inferred that the volcanic basement in the central Sichuan area is the potential source rock for natural H2in the Sinian to Triassic ***,H2originates from the radiolysis of water and hydrothermal reactions of Fe（II） in the basement ***,a diffusion fractionation model reveals significant isotope fractionation during the migration and accumulation of deep H2into sedimentary reservoirs,which lead to anomalously light δ2HH2in deep natural gas in central *** indicates that the underground natural hydrogen accumulation is in a long-term dynamic process,with simultaneous H2accumulation and dissipation in the gas *** research not only elucidates the formation mechanism of deep H2but also provides insights for the resource potential of natural hydrogen in sedimentary basins.

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Machine vision for drill string slip status detection

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petroleum Research 2022年第1期7卷 115-122页

作者： Sunil Kumar Khare dept.of petroleum engineering and earth sciences University of Petroleum and Energy StudiesDehradunUK248007India

Slip status of drill string is system generated binary value computed by comparison of sensor generated real time hook load value with a minimum threshold value of hook load stored in measurement *** research article describes a novel method of slip status detection by machine vision technology which helps overcome the constraints of slip status detection with legacy measurement *** also helps improve the real time drilling data quality and optimize and automate drilling operations.A method to detect drill string slip status with high-resolution digital camera installed on mast near rig floor is described along with backend vision processing and communication modules,which generate binary values of slip *** binary values are transferred in real time to drilling measurement system of rig to compute other drilling parameters like bit depth,hole depth and stand *** method includes deploying active optical sensors at the rig floor,obtaining 1-D,2-D,or 3D image data,and processing it to obtain the status of drill *** measurement of slip status by machine vision helps reduce non-productive time(NPT)by reliable real time surveillance of drilling operations.

关键词： Oil and gas Machine vision Camera Slip-status Rig Drilling Rotary table NPT Drilling fluid Drill pipe

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Mineral characteristics and their geological significance of black shales in southeastern Ordos Basin by X-ray diffraction analysis

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Chinese Journal Of Geochemistry 2014年第1期33卷 119-124页

作者： YAO Zhigang YANG Yang YING Huawei DONG Yunpeng School of earth sciences and engineering Xi'an Petroleum University

X-ray diffraction analysis of black shale of Upper Triassic Member Chang 7 of the Yanchang Formation in southeastern Ordos Basin showed that black shales were deposited in brackish, strongly reducing, semi-deep-deep lacustrine facies, and mainly composed of quartz, feldspar, carbonate(dolomite), clay minerals(illite and illite/smectite) and a certain amount of pyrite. The mineral composition characteristics of this set of black shales are similar to those of highly productive shale gas in North America, for example shallow burial, low clay mineral and abundant brittle mineral, so the strata are conducive to the development of cracks and fractures. Thus, this area is favorable for shale oil/gas exploration and development.

关键词：鄂尔多斯盆地黑色页岩粘土矿物 X射线衍射分析东南部地质意义特征和 X-射线衍射分析

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Estimation of the water–oil–gas relative permeability curve from immiscible WAG coreflood experiments using the cubic B-spline model

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petroleum Science 2016年第3期13卷 507-516页

作者： Dai-Gang Wang Yong-Le Hu Jing-Jing Sun Yong Li Research Institute of petroleum Exploration & Development PetroChina School of earth and Space sciences Peking University College of petroleum engineering China University of Petroleum

Immiscible water-alternating-gas（WAG） flooding is an EOR technique that has proven successful for water drive reservoirs due to its ability to improve displacement and sweep ***,considering the complicated phase behavior and various multiphase flow characteristics,gas tends to break through early in production wells in heterogeneous formations because of overriding,fingering,and channeling,which may result in unfavorable recovery *** the basis of phase behavior studies,minimum miscibility pressure measurements,and immiscible WAG coreflood experiments,the cubic B-spline model（CBM） was employed to describe the three-phase relative permeability *** the Levenberg-Marquardt algorithm to adjust the vector of unknown model parameters of the CBM sequentially,optimization of production performance including pressure drop,water cut,and the cumulative gas-oil ratio was performed.A novel numerical inversion method was established for estimation of the water-oil-gas relative permeability curve during the immiscible WAG *** on the quantitative characterization of major recovery mechanisms,the proposed method was validated by interpreting coreflood data of the immiscible WAG *** proposed method is reliable and can meet engineering *** provides a basic calculation theory for implicit estimation of oil-water-gas relative permeability curve.

关键词： Cubic B-spline model Immiscible WAG flooding Relative permeability Numerical inversion

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Enhanced Performance of Denitrifying Sulfide Removal Process by 1,2-Naphthoquinone-4-Sulphonate

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China petroleum Processing & Petrochemical Technology 2016年第1期18卷 22-28页

作者： Liu Chunshuang Han Kang Zhao Dongfeng Guo Yadonag Liu Lihong Liu Fang Zhao Chaocheng College of Chemical engineering China University of PetroleumQingdao School of earth sciences Northeast Petroleum University

The denitrifying sulfide removal(DSR) process with bio-granules comprising both heterotrophic and autotrophic denitrifiers can simultaneously convert nitrate, sulfide and acetate species into di-nitrogen gas, elemental sulfur and carbon dioxide, respectively, at high loading rates. This study has determined that the reaction rate of sulfide oxidized into sulfur could be enhanced in the presence of 1,2-naphthoquinone-4-sulphonate(NQS). The presence of NQS mitigated the inhibition effects of sulfide species on denitrification. Furthermore, the reaction rates of nitrate and acetate to nitrogen gas and CO_2, respectively, were also promoted in the presence of NQS, thereby enhancing the performance of DSR granules. The advantages and disadvantages of applying the NQS-DSR process are discussed.

关键词： denitrifying sulfide removal NQS inhibition bio-granules

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Cretaceous source rocks and associated oil and gas resources in the world and China: A review

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petroleum Science 2014年第3期11卷 331-345页

作者： Yang Ruofei Wang Yuce Cao Jian State Key Laboratory for Mineral Deposits Research Department of Earth Sciences Nanjing University School of petroleum engineering China University of Petroleum Qingdao

The Cretaceous is one of the most important stratigraphic intervals for hydrocarbon source rocks. This article summarizes the distribution, formation, and development characteristics of Cretaceous source rocks and associated oil and gas resources in the world and China, aiming at improving the understanding of this hydrocarbon enrichment and at broadening domestic exploration. Outside China, these rocks are generally formed in marine or transgressive environments during both the Upper and Lower Cretaceous. The majority of Cretaceous source rocks are located in the Persian Gulf, Mediterranean, and Gulf Coast of the USA. Kerogen types within these source rocks have distinct spatial distribution characteristics, with high-latitude Boreal Realm, Tethyan Realm and South Gondwana Realm source rocks containing type III, II, II-III kerogens, respectively. Cretaceous source rocks in China can be mainly divided into four zones： Eastern, Central, Northwest, and Qinghai-Tibet Plateau zones. The majority of Chinese source rocks formed in the Early Cretaceous, whereas the most productive source rocks are developed in the Upper Cretaceous, such as those within the Songliao Basin. Most of these basins are formed in lacustrine environments, although some may have been influenced by transgressive events： Cretaceous source rocks are formed in four distinctive ways： 1） during Oceanic Anoxic Events and associated global sea-level rises, 2） in Black Sea-type retention basins, 3） during transgression and 4） during periods of significant terrestrial input. Formation of these source rocks is controlled by four factors： paleoclimate, paleotopography, transgression, and Oceanic Anoxic Events. These four major controlling factors indicate that China＇s hydrocarbon exploration within the Cretaceous should focus on two key areas with extremely low exploration levels, the Qinghai-Tibet Plateau and the southeastern coast of China.

关键词： Cretaceous source rock organic matter Tethys transgression

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Molecular Simulation of Methane Adsorption in Different Micro Porous Activated Carbons at Different Temperatures

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Journal of Wuhan University of Technology(Materials Science) 2023年第1期38卷 1-11页

作者： Rugarabamu John Rwiza 赵东风 SONG Kunli LI Shi College of Chemical engineering China University of Petroleum(East China)Qingdao 266580China College of earth sciences and engineering The University of DodomaDodomaTanzania

We employed the previously developed micro porous activated carbon models of different pore sizes ranges of 9-11?,10-12?,and 13-16?that were constructed by molecular simulation method based on a random packing of platelets of carbon sheets,functionalized with oxygen containing groups,to study the adsorption behavior of methane *** studying methane adsorption behavior,we used Grand Canonical Monte Carlo and Molecular Dynamics methods at different temperatures of 273.15,298.15 and303.15 *** isotherms,isosteric heats of adsorption,adsorption energy distributions and porosity changes of the models during adsorption process were analyzed and ***,radial distribution Functions,relative distribution and diffusion coefficients of methane molecules in activated carbon models at different temperatures were *** the analysis,the main results indicated that large micro pores activated carbons were favorable for storing methane at lower temperatures and small micro pores were the most favorable for adsorbing methane molecules at higher ***,the developed model structures showed high capacities to store methane molecule at ambient temperatures and low pressure.

关键词： Molecular simulation activated carbon methane adsorption MD GCMC

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On the prediction of geochemical parameters(TOC,S1 and S2)by considering well log parameters using ANFIS and LSSVM strategies

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petroleum 2022年第2期8卷 174-184页

作者： Danial Ahangari Reza Daneshfar Mohammad Zakeri Siavash Ashoori Bahram Soltani Soulgani Department of petroleum engineering Petroleum University of TechnologyAhwazIran Department of Geology Faculty of Earth SciencesS.Chamran University of AhwazIran

Geochemical parameters are useful properties to enhance hydrocarbon exploration ***,attaining these parameters,for instance total organic carbon(TOC),volatile and residual hydrocarbon(S1&S2)is a challenge for geologists due to the high cost and time ***,addressing this issue has become an interesting subject for many *** a result,on the ground of conventional well logs,vast kinds of methods,for example,back propagation artificial neural network(BPANN),have been introduced to solve this *** these kinds of methods brings scientists tremendous amounts of information related to the richness of organic matter in a ***,the precision of the aforementioned method is inadequate and BPANN is affected negatively by local ***,current study cope with this issue and alleviate the uncertainty,Least Squares Support Vector Machine(LSSVM)and Adaptive-Neuro Fuzzy Inference System(ANFIS)algorithms cooperating with the particle swarm optimization(PSO)were suggested as a suitable method to increase the precision of estimating geochemical *** data bank for this research was attained from available sources of Shahejie formation from Bohai bay basin located in China,which consists of geochemical and well logging *** of this study illustrated that ANFIS-PSO and LSSVMPSO have a great ability to estimate geochemical *** values of R^(2) obtained for these two models in order to predict the output parameters of TOC,S_(1) and S_(2) are equal to 0.6846&0.785,0.6864&0.778,and 0.7343&0.8128,*** statistical comparison between these models shows that LSSVM-PSO shows a better performance compared to another ***,a new attempt was implemented to evaluate the impacts of input parameters on the outputs and the results of sensitivity analysis suggest that transit interval time had the greatest effect on the output parameters.

关键词： Least squares support vector machine Total organic carbon Well log parameters Adaptive-neuro fuzzy inference system Particle swarm optimization

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Extraction of tectonic imprints using geospatial techniques:Evidence from Mandakini River basin,Uttarakhand,India

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Journal of Mountain Science 2024年第11期21卷 3720-3738页

作者： Atul Kumar PATIDAR Girish Ch.KOTHYARI Manmohan KAUSHIK Sushil KHANDURI Department of petroleum engineering and earth sciences UPESDehradun 248007India KainGeotech Consultancy Dehradun 248007India

The existing literature discussed only the aerial aspect and provided a brief description of tectonic-geomorphic correlation with field *** present study we applied power law equations to estimate basin asymmetry factor(AF),Transverse topographic asymmetric factor(T),Hypsometric Integral(HI),longitudinal profile,stream length gradient index(SL),steepness index(Ksn),Chi(χ),and knick point(Kp)analysis to examine the response of tectono-climatic fluctuations in the Mandakini River basin,central Uttarakhand *** decouple the causative tectono-climatic factors,we employed geospatial and Stream Power Incision Modeling(SPIM)*** is a globally accepted tool to predict an equilibrium state between fluvial erosion rates and the escalating function of stream *** is actively applied in modeling the transformation of river systems especially in rugged topographic *** present study covers SPIM-based morphometric assessment of the tectonically sensitive Mandakini River basin between Ramgarh Thrust(RT)and Vaikrita Thrust(VT)in the central region of Uttarakhand *** the upper reaches of the basin,U-shaped glaciated valleys dominate the landscape,while a rolling topography and deeply incised narrow valleys are depicted towards the ***,to understand the response of active tectonic over geomorphology,the drainage basin has been divided into two separate zones from the confluence point near the Rampur *** modeling outcomes indicate that the Mandakini drainage basin is in a disequilibrium state where channels are actively incising to ***,AF of 32 and 70 indicate leftward tilting in the upper reaches and rightward tilting in the lower reaches of the basin,*** HI value of 0.38 indicates a stage of maturity,characterized by a concave shape *** on the analysis it may be concluded that the fragile lithology and tectono-climatic fluctuations are dominantly controlling the topography and valle

关键词： Stream Power Incision Model(SPIM) Transverse Topographic Asymmetry Factor(T) Knick points Hypsometric curve Mandakini River Garhwal Himalaya

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A New Discovery of ～3.0 Ga Tonalitic Gneiss in Northern Liaoning Province, China

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Acta Geologica Sinica(English Edition) 2018年第5期92卷 2043-2045页

作者： LI Zhuang LIU Jin WEI Chunjing CHEN Bin State Key Laboratory of petroleum Resources and Prospecting China University of Petroleum (Beijing) College of Geosciences China University of Petroleum (Beijing) School of earth sciences and engineering Sun Yat-Sen University School of earth and Space sciences Peking University School of Resources and Environmental engineering Hefei University of Technology

Objective The North China Craton,bounded by the Paleozoic Central Asian Orogenic Belt on the north and by the Qinling–Dabie–Su–Lu Orogenic Belt on the south,is one of the oldest continental nuclei on earth as a consequence of its preservation of some of the oldest rock records ranging up to ca.3.85 Ga and mineral older than 4.0 Ga（Li et al.,2016,2017）.

关键词： A New Discovery of ICP Pb China

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