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Origin and Evolution Process of Overpressure in the Shahezi Formation of Xujiaweizi Fault Depression in the Northern Songliao Basin,NE china

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Acta Geologica Sinica(English Edition) 2025年第1期99卷 212-227页

作者： ZHANG Chengju JIANG Zhenxue LU Jiamin SHI Lidong BI Zhongyu SUN Lidong YANG Liang LI Xiaomei LIU Jiajun MIAO Huan national Key Laboratory of petroleum Resources and Engineering China University of Petroleum(Beijing)Beijing 102249China Unconventional petroleum Research Institute China University of Petroleum(Beijing)Beijing 102249China Exploration and Development Research Institute of Petrochina Daqing oilfield Company Limited DaqingHeilongjiang 163712China

It is of great significance for deep oil and gas exploration to understand the origin and evolution behind *** occurs in the deep Shahezi Formation of Xujiaweizi fault ***,due to limited degree of exploration,there are some problems in the study area,such as unclear understanding of the origin of overpressure and the vague investigation of overpressure *** clarify the impact of overpressure on oil and gas migration and accumulation in the study area,this study focuses on the research of the origin and evolution of overpressure in the Shahezi Formation of the study area,utilizing single well logging parameters and combining methods such as microthermometry of fluid inclusions,laser Raman spectrum,and basin *** results show that the overpressure of the Shahezi Formation in Xujiaweizi fault depression is primarily generated by hydrocarbon generation pressurization,and the evolution of overpressure is closely related to hydrocarbon *** development of overpressure can be divided into two evolutionary stages:early hydrocarbon generation pressurization and late uplift release,with slight variations in different *** glutenite gas reservoirs in the Shahezi Formation are characterized by continuous *** overall charging period ranges from the late Denglouku to the early Mingshui(110-67 Ma ago).There is an obvious paleo-overpressure during the gas reservoir formation *** gas generation period of source rocks occurred approximately 125-60 Ma ago,and the main gas generation period(112-67 Ma ago)highly coincides with the period of natural gas *** anomalously high pressure during the accumulation period is considered the significant driving force for natural gas *** addition,the sustained effect of overpressure provides better conditions for the preservation of tight gas reservoirs within the *** results of the study are of guiding significance for the in-depth expl

关键词： fluid inclusion laser Raman spectrum basin simulation overpressure genesis paleo-pressure recovery Shahezi Formation Xujiaweizi fault depression

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Deep-sea oil and gas plow-type cable broadband wide-azimuth 3D seismic acquisition and imaging

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Science china Earth Sciences 2025年第3期68卷 683-701页

作者： Yunfei YE Li-Yun FU Lijun MI Chuncai CHEN Zhenhua JIAO Hanming GU Yu WU china national Offshore Oil corporation Research Institute Co. Ltd. national Key Laboratory of Deep Oil and Gas China University of Petroleum (East China) china oilfield Services Limited School of Geophysics and Space Information China University of Geosciences (Wuhan) Sinopec Geophysical Research Institute Co. Ltd.

In recent years, significant advancements have been made in deep-sea broadband seismic acquisition and its support data processing technologies. Compared with traditional constant-depth flat-cable acquisition, variable-depth cable acquisition significantly differentiates frequency notches and enhances information complementarity between traces, effectively broadening the frequency band of acquired seismic data. Based on the international slanted cable technology, china has independently developed a plow-type cable seismic acquisition and imaging system: a combination of slanted and deep-deployed flat cables,along with a deghosting processing technique. This innovation optimizes the segmented depth variation of cables, further improving low-frequency response and broadening the high-frequency range. This paper extends the 2D technology into three dimensions, establishing an integrated technology system for deep-sea broadband, wide-azimuth seismic acquisition and imaging, consisting of three-ship and six-source acquisition equipments, 3D plow-type cable mat, blended acquisition design with rolling dual-random sources, and wavenumber-domain 3D deghosting techniques. Applications to two tectonic zones in the South china Sea demonstrate that the frequency band of seismic data is expanded from three octaves(8–85 Hz) by conventional acquisition and imaging methods to five octaves(2–130 Hz), significantly improving the data quality and imaging precision of deep structures. This advancement effectively supports the researches of fundamental geology, hydrocarbon accumulation,reservoir prediction, and fluid identification in deep-water basins. The successful deployment of these technologies has advanced china's deep-sea oil and gas exploration and has been generalized to more than ten international deep-sea oilfields.

关键词： Deep-sea oil and gas Broadband wide-azimuth 3D plow-type cable deployment Three-ship six-source blended acquisition Deghosting

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Study on the Fluid-Solid Coupling Seepage of the Deep Tight Reservoir Based on 3D Digital Core Modeling

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Energy Engineering 2025年第2期122卷 537-560页

作者： Haijun Yang Zhenzhong Cai Hui Zhang Chong Sun Jing Li Xiaoyu Meng Chen Liu Chengqiang Yang Petrochina tarim oilfield Company Korla841000China CNPC R&D Center for Ultra-Deep Complex Reservoir Exploration and Development Korla841000China national Key Laboratory of Deep Oil and Gas China University of Petroleum(East China)Qingdao266580China Structure and Shipping Department Offshore Oil Engineering(Qingdao)Co.Ltd.Qingdao266520China

Deep tight reservoirs exhibit complex stress and seepage fields due to varying pore structures,thus the seepage characteristics are significant for enhancing oil *** study conducted triaxial compression and permeability tests to investigate the mechanical and seepage properties of tight sandstone.A digital core of tight sandstone was built using Computed Tomography(CT)scanning,which was divided into matrix and pore phases by a pore equivalent diameter threshold.A fluid-solid coupling model was established to investigate the seepage characteristics at *** results showed that increasing the confining pressure decreased porosity,permeability,and flow velocity,with the pore phase becoming the dominant seepage *** and large pores closed first under increasing pressure,resulted in a steep drop in ***,permeability slightly decreased under high confining pressure,which followed a first-order exponential *** velocity increased with seepage *** the damage mainly occurred in stress-concentration regions under low seepage *** behavior followed linear Darcy flow,the damage emerged at seepage entrances under high pressure,which decreased rock elastic modulus and significantly increased permeability.

关键词： Digital core fluid-solid coupling pore structure microscopic seepage

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Impact of Burial Dissolution on the Development of Ultradeep Fault-controlled Carbonate Reservoirs:Insights from High-temperature and High-pressure Dissolution Kinetic Simulation

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Acta Geologica Sinica(English Edition) 2025年第1期99卷 228-242页

作者： TAN Xiaolin ZENG Lianbo SHE Min LI Hao MAO Zhe SONG Yichen YAO Yingtao WANG Junpeng LU Yuzhen national Key Laboratory of petroleum Resources and Engineering China University of Petroleum(Beijing)Beijing 102249China College of Geoscience China University of Petroleum(Beijing)Beijing 102249China Petrochina Hangzhou Institute of Geology Hangzhou 310023China Shenzhen Branch of CNOOC(china)Co. Ltd.Shenzhen 518000China

Burial dissolution is a critical diagenetic process influencing ultra-deep carbonate reservoir development and *** carbonate samples with different internal structures were prepared,and high-temperature and highpressure dissolution kinetic simulations were *** results demonstrate that the intensity of burial dissolution is controlled by temperature and pressure,while tectonic-fluid activity influences the development pattern of burial dissolution,ultimately determining the direction of its differential *** burial dissolution is likely to occur primarily at relatively shallow depths,significantly influencing reservoir formation,preservation,modification,and *** development of faults facilitates the maintenance of the intensity of burial *** maximum intensity of burial dissolution occurs at the tips and overlap zones of faults and intersections of multiple *** larger the scale of the faults,the more conducive it is to the development of burial *** dissolution fosters the formation of fault networks characterized by enhanced reservoir capacity and *** dissolution controlled by episodic tectonic-fluid activity is a plausible explanation for forming the tarim Basin's ultra-deep fault-controlled“stringbead-like”reservoirs.

关键词： burial dissolution tectonic-fluid ultra-deep carbonate reservoirs high-temperature and high-pressure dissolution kinetic simulation

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Phase Behavior and Dew Point Pressure of Multicomponent Condensate Gas in Nanopores

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Fluid Dynamics & Materials Processing 2025年第2期21卷 279-292页

作者： Jichao Zhao Xu Yan Jing Sun Sheng Li petroleum Engineering College Yangtze UniversityWuhan430199China Hubei Key Laboratory of Oil and Gas Drilling and Production Engineering(Yangtze University) Wuhan430199China Exploration&Development Project Department of Mahu Area of Xinjiang oilfield Company China National Petroleum CorporationKaramay834000China

Shale gas reservoirs typically contain numerous nanoscale pores,with pore size playing a significant role in influencing the gas *** better understand the related mechanisms,this study employs the Gauge-GEMC molecular simulation method to systematically analyze the effects of various pore sizes(5,10,20,and 40 nm)on the phase behavior and dew point pressure of the shale gas reservoir *** simulation results reveal that when pore sizes are smaller than 40 nm,the dew point pressure increases significantly as the pore size *** instance,the dew point pressure in 5 nmpores is 20.3%higher than undermacroscopic ***,larger hydrocarbon molecules exhibit a tendency to aggregate in smaller pores,particularly in the 5–10 nm range,where the relative concentration of heavy hydrocarbons(C_(4+))increases ***,as the pore size becomes larger,the component distribution gradually aligns with experimental results observed under macroscopic *** study demonstrates that pore effects are more pronounced for smaller sizes,directly influencing the aggregation of heavy hydrocarbons and the rise in dew point *** phenomena could significantly impact the diffusivity of shale gas reservoirs and the recovery of condensate *** findings provide new theoretical insights into phase behavior changes in nanopores,offering valuable guidance for optimizing shale gas reservoir extraction strategies.

关键词： Condensate gas nanopores molecular simulation dew point pressure confinement effect

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The deposition of asphaltenes under high-temperature and highpressure (HTHP) conditions

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petroleum Science 2023年第1期20卷 611-618页

作者： Rui-Ying Xiong Ji-Xiang Guo Wyclif Kiyingi Hai-Xia Xu Xin-Peng Wu Unconventional petroleum Research Institute China University of PetroleumBeijing102249China petroleum Engineering Research Institute of tarim oilfield China National Petroleum CorporationXinjiang84100China

In this work,the factors affecting asphaltenes deposition in high-temperature and high-pressure wells were studied using backscattered light and PVT equipment customized to suit the well *** an examination of the intensity of backscattered light,it was revealed that there exists a linear relationship between temperature and asphaltene precipitation within a specific temperature *** this range,a decrease in temperature tends to accelerate asphaltene ***,the impacts of pressure and gas-oil ratio are more *** pressure depletion induces the asphaltenes to precipitate out of the solution,followed by the formation of flocs below the bubble *** addition,an increase in the gas-oil ratio causes a more severe asphaltene deposition,shifting the location of asphaltenes to deep well sections.

关键词： HTHP reservoir Asphaltene Aggregation Gas-oil ratio HTHP PVT cell Back-scattered light

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Rapid hydrate formation and efficient gas separation based on aqueous solid carrier

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Chinese Journal of Chemical Engineering 2024年第10期74卷 127-132页

作者： Haibo Liu Qiang Sun Xiaodong Liu Du Sun Guangjin Chen china oilfield Services Limited Sanhe 065201China State Key Laboratory of Heavy Oil Processing China University of Petroleum-BeijingBeijing 102249China tarim oilfield Branch of china national petroleum corporation Korla 841000China

The long hydrate induction time and limited gas-liquid contact area leads to slow hydrate formation rate and low water-hydrate conversion *** media are often used to promote hydrate formation because of their large specific surface ***,we used 3A molecular sieve as a water-carrying solid in this work,and investigated the dynamic renewal of the gas-liquid interface and its effect on hydrate *** formation kinetics of ethane hydrate was first measured in an aqueous molecular sieve *** the separation of(H_(2)+CH_(4)+C_(2)H_(6)+C_(3)H_(8))gas mixture was conducted via hydrate *** results show that the formation rate and gas storage capacity of ethane hydrate can be greatly improved by using aqueous molecular *** with a pure water system under the same temperature and pressure,aqueous molecular sieve has obvious advantages in separation effect and energy consumption for separating gas mixtures.

关键词： Hydrate Formation kinetics Gas storage capacity Gas separation Aqueous molecular sieve

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Combined use of fly ash and silica to prevent the long-term strength retrogression of oil well cement set and cured at HPHT conditions

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petroleum Science 2024年第2期21卷 1122-1134页

作者： Guo-Dong Cheng Xue-Yu Pang Jin-Sheng Sun Zheng-Song Qiu Chuang-Chuang Wang Jian-Kun Qin Ning Li School of petroleum Engineering China University of Petroleum(East China)Qingdao266580ShandongChina national Key Laboratory of Deep Oil and Gas China University of Petroleum(East China)Qingdao266580ShandongChina Oil and Gas Engineering Research Institute(tarim oilfield Company) China National Petroleum CorporationTarim841000XinjiangChina

The long-term strength retrogression of silica-enriched oil well cement poses a significant threat to wellbore integrity in deep and ultra-deep wells, which is a major obstacle for deep petroleum and geothermal energy development. Previous attempts to address this problem has been unsatisfactory because they can only reduce the strength decline rate. This study presents a new solution to this problem by incorporating fly ash to the traditional silica-cement systems. The influences of fly ash and silica on the strength retrogression behavior of oil well cement systems directly set and cured under the condition of 200°C and 50 MPa are investigated. Test results indicate that the slurries containing only silica or fly ash experience severe strength retrogression from 2 to 30 d curing, while the slurries containing both fly ash and silica experience strength enhancement from 2 to 90 d. The strength test results are corroborated by further evidences from permeability tests as well as microstructure analysis of set cement. Composition of set cement evaluated by quantitative X-ray diffraction analyses with partial or no known crystal structure(PONKCS) method and thermogravimetry analyses revealed that the conversion of amorphous C-(A)-S-H to crystalline phases is the primary cause of long-term strength *** addition of fly ash can reduce the initial amount of C-(A)-S-H in the set cement, and its combined use with silica can prevent the crystallization of C-(A)-S-H, which is believed to be the working mechanism of this new admixture in improving long-term strength stability of oil well cement systems.

关键词： Fly ash Long-term strength retrogression High temperature Quantitative X-ray diffraction(QXRD) Partial or no known crystal structure(PONKCS)

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Transport feasibility of proppant by supercritical carbon dioxide fracturing in reservoir fractures

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Journal of Hydrodynamics 2018年第3期30卷 507-513页

作者： Xian-zhi Song Gen-sheng Li Bin Guo Hai-zhu Wang Xiao-jiang Li Ze-hao Lv State Key Laboratory of petroleum Resources and Prospecting China University of PetroleumBeijingBeijing 102249China Petrochina tarim oilfield Company Korla 841000China

The pure supercritical carbon dioxide（SC-CO2） fracturing prevents the clay from swelling and avoids the water lock as compared with the slick-water fracturing. The CO2 molecule could replace the CH4 adsorbed in organic matter and tiny particles on the clay mineral surface in the formation. This leads to an increased cumulative gas production rate. The SC-CO2 fracturing is an alternative waterless fracturing technique for an effective future development of shale gas reservoirs. Due to its low density and viscosity as compared with the slick-water, it attracts attentions for the proppant transport. In this paper, the two phase flow of the SC-CO2 and the proppant in fractures during the SC-CO2 fracturing is analyzed with the computational fluid dynamics method. The characteristics of the proppant transport by the SC-CO2 fracturing and the slick-water fracturing are compared. Moreover, a sensitivity analysis is also performed to see the influence of various parameters on the proppant transport ability of the SC-CO2 fracturing. It is shown that the proppants in the SC-CO2 and the slick-water have similar distribution characteristics. Reducing the proppant density, the proppant diameter, and the solid volume fraction as well as increasing the injection rate can all have similar filling effects on the fractures. The feasibility of the proppant transport by the SC-CO2 fracturing in fractures is revealed and a guidance is provided for the SC-CO2 fracturing design.

关键词： Supercritical carbon dioxide fracturing fracture sand carrying numerical simulation

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Sedimentary Response of Different Fan Types to the Paleogene-Neogene Basin Transformation in the Kuqa Depression,tarim Basin,Xinjiang Province

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Acta Geologica Sinica(English Edition) 2009年第2期83卷 411-424页

作者： GAO Zhiyong GUO Hongli ZHU Rukai ZHANG Lijuan SUN Yushan Research Institute of petroleum Exploration and Development Petrochina Beijing 100083 China Research Institute of petroleum Exploration and Development Petrochina Tarim Oilfield Corporation Xinjiang 841000 China

A group of alluvial fans formed in the early Paleogene represent marginal sedimentary facies at the foot of the South Tianshan Mountain, Kuqa Depression, tarim Basin, Xinjiang province. Two types of fans occurred in the middle-late Paleogene Kumugeliemu and Suweiyi formations： one alluvial, and the other fan delta deposited in a lacustrine setting. Within the early Neogene Jidike Formation, coastal subaqueous fans developed, probably in a deeper water lacustrine setting. The three types of fans are stacked vertically in outcrop with the sequence in ascending order： bottom alluvial, middle fan-delta, and top suhaqueous. The subaqueous is a typical coarse-fan deposit occurring in the glutinite member of the Jidike Formation in some wells. Laterally, from the foreland to the lacustrine settings, the distribution pattern of sedimentary facies represents the same three fan types sequentially. The spatial distribution of these fans was controlled by the Paleogene-Neogene Basin transformation, and evolution with different types of fans developed in the Kuqa Depression in response. In the Paleogene, the Kuqa Depression was a rift basin where an alluvial fan was deposited in the foreland setting, which, by early Neogene, became a foreland basin when the lake level changed. With any rise in lake level, fan-deltas migrated from lacustrine to foreland settings, whereas when the lake level fell, fan migration was reversed. In the early Neogene, with increasing slope and rising lake level, fans progressed and covered the previous fan-delta and lacustrine mudstone. Eventually, subaqueous fans developed, forming the present spatial configuration of these three fan types.

关键词： Paleogene-Neogene fan types Kuqa Depression tarim Basin Xinjiang

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