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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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Autocyclic switching processes and architecture of lobes in river-dominated lacustrine deltas

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Journal of Palaeogeography 2025年第1期14卷 126-140页

作者： Zhen-Hua Xu Sheng-He Wu Piret Plink-Bj?rklund Tao Zhang Da-Li Yue Qi-Hao Qian Qing Li Wen-Jie Feng National Key Laboratory of Petroleum Resources and Engineering China University of Petroleum (Beijing) College of Geosciences China University of Petroleum (Beijing) Department of Geology and Geological Engineering Colorado School of Mines Gas Production Plant 2 PetroChina Changqing Oilfield Company petrochina Research Institute of Petroleum Exploration and Development College of Geosciences Yangtze University

River-dominated lacustrine deltas typically consist of multiple lobes due to autogenic lobe switching that occurs over short time scales. However, the switching patterns of multiple lobes in these deltas remain poorly understood, and the architectural features attributed to lobe switching are also lacking. By integrating Delft3D simulations, flume experiments, and modern deposit analysis, we proposed that autogenic lobe switching follows a cyclic pattern. Autocyclicity begins with the formation of an offshore lobe and concludes after a series of longshore lobe growth events, marked by longshore avulsions occurring along the sides of offshore distributary *** avulsions follow a sequence that usually occurs earlier distally than proximally and subsequently occurs on one longshore side and then on the other side. Each lobe begins with rapid growth, which gradually slows and then stops once a channel avulsion is influenced by the backwater effect that triggers lobe switching. Three signals indicate lobe switching: a decrease in progradation rate, foreset slope steepening coupled with topset slope gentling, and the deposition of mud-dominated sediments. The number of autocyclic events never exceeds *** first two autocyclicities contribute to more than 55% of delta length and 70% of delta area. The lobes are separated by 1-6 stages of mud-dominated accretion beds that exhibit a downstream-inclined shape and convexup or lateral overlapping pattern. This study conducts a coupled growth-geometric assessment to establish an architectural pattern for river-dominated lacustrine deltas. This architectural pattern offers valuable insights into predicting sandy lobe distribution in river-dominated lacustrine delta reservoirs, and the architecture of muddy accretion beds aids in predicting the rule of oil-water movement and distribution of remaining oil.

关键词： Autocyclic lobe switching River-dominated lacustrine delta Architecture Avulsion sequence Backwater effect

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The Influence of Microbial Community on Oil Reservoirs:A Case Study on the Mesozoic Natural Gas in the Pengyang Area,Southwestern Ordos Basin,China

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Acta Geologica Sinica(English Edition) 2025年第1期99卷 144-158页

作者： SHANG Ting NIU Xiaobing LI Mingrui ZHANG Zhongyi HUANG Xuan HAN Tianyou ZHANG Xiaolei LI Jihong CHU Meijuan LIU Xin School of Geography and the Environment Xianyang Normal UniversityXianyang712000China State Key Laboratory of Continental Dynamics Northwest UniversityXi'an 710069China petrochina Changqing oilfield company Xi'an 710018China Exploration&Development Research Institute of petrochina Changqing oilfield company Xi'an 710018China National Engineering Laboratory for Exploration and Development of Low-Permeability Oil&Gas Fields Xi'an 710018China Northwest University Xi’an 710069China

The formation of Mesozoic natural gas in the Pengyang area of southwestern Ordos Basin is discussed,from the perspective of microbial community characteristics,in order to clarify the relationship between the origin of natural gas and its associated indigenous microbial *** types and diversity of indigenous microbial communities associated with the oil reservoir were studied by means of collecting reservoir formation water samples from exploration *** indigenous microbial communities in the Chang 8 member of the Yanchang Formation were primarily distributed within Proteobacteria and Firmicutes,including the specific species and genera of Methylobacter,Pseudomonas,Haibacter,Toxobacillus,Acinetobacter and Adura *** results of diversity analysis shows that the number of common genes was 5448,while the number of unique genes and information was *** reflects the fact that the strata in the study area are relatively closed and not invaded by external water sources,which leads to the development of biological community *** conjunction with the analysis of geochemical characteristics of oil and gas reservoirs in this area,this indicates that the study area possesses the necessary geological conditions for microbial *** is the first time that the species and diversity of the indigenous microbial community in the Ordos Basin have been analyzed,showing that microbial degradation is the main cause of natural gas formation here,changes the characteristics of crude oil in this area and provides first-hand information on the impact of indigenous microorganisms on the reservoir.

关键词： microbial community source of natural gas Yanchang Formation Pengyang area Ordos Basin

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Sealing Integrity Evaluation and Optimization of Cement Sheath-Formation Interface under Different Formation Conditions during Fracturing

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Journal of Earth Science 2025年第1期36卷 223-232页

作者： Donghua Su Sheng Huang Zaoyuan Li Jin Li Ziyu Wang Shizhong Tang Hua Wu Bo Zhao State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu 610500China Petroleum Engineering School Southwest Petroleum UniversityChengdu 610500China Foreign Cooperation Projects Department PetroChina Dagang Oilfield CompanyTianjin 300280China Oil Production Technology Institute PetroChina Dagang Oifield CompanyTianjin 300280China International Engineering company CNPC Bohai Drilling Engineering Co.Ltd.Tianjin 300280China

Fluid channeling caused by seal failure at the cement sheath-formation interface during fracturing is a severe problem in oil gas *** this study,a novel model was developed to evaluate interface sealing *** model's accuracy was verified based on a self-developed interface seal evaluation device and an ***,the interface seal under different formation conditions was investigated using this *** theoretical calculation showed that for a cement sheath-carbonate formation interface,the channeling of acid-fracturing fluid caused interface seal failure and sustained casing pressure in the annulus space between the technical casing and *** channeling between the fracturing sections occurred at the cement sheathshale formation interface during *** a sandstone formation,the interface seal failure caused the channeling between a water-bearing formation and a sandstone *** at different formation conditions,the mechanical properties requirements of Young's modulus and Poisson's ratio of cement sheath were proposed respectively to ensure its seal *** proposed model and method can be used to evaluate and optimize sealing integrity during fracturing.

关键词： sealing integrity fracturing interface fluid channeling

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Production analysis and permeability evolution of fractured horizontal wells of coalbed methane reservoir

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Meitan Xuebao/Journal of the China Coal Society 2025年第1期50卷 516-531页

作者： Guo, Jianchun Zhang, Tao Wu, Xi Zhao, Zhihong Li, Zongyuan Zeng, Jie National Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum University Chengdu610500 China petrochina Huabei oilfield company Renqiu062552 China

Massive hydraulic fracturing has changed the status of low-productivity and low development efficiency for coalbed methane (CBM) reservoirs. However, the production dynamics of fractured wells and the permeability evolution mechanisms in CBM reservoirs are unclear, which significantly limits the efficient development of CBM reservoirs. Therefore, this study incorporates the total strain evolution under the conditions of gas-adsorption-induced swelling, fracture compression, and unsteady creep, uses the cubic law to establish the permeability model, and obtains the pressure and flow fields via the finite volume method (FVM) and the transient embedded discrete fracture model (tEDFM). Based on the embedded mass exchange law, an adsorbed-free phase multiple-mechanism recovery calculation framework is established to realize production dynamic analysis and productivity calculation. Results show that the production dynamics of CBM fractured wells include five stages: the initial high production stage, desorption-induced productivity increasing stage, mid-time stable production stage, production decline stage, and the final depleted stage. The larger the Langmuir pressure is, the faster sorbed gas production would be. When the Langmuir pressure is 2.6 MPa, after 1 800-day production, adsorbed gas dominates production. When the Langmuir volume is increased to 15 m3/t, desorbed gas’s contribution continuously increases. Adsorbed gas becomes the main gas source after 560-day production. The denser the hydraulic fractures are, the larger the drainage area is, the significantly higher the initial production would be, and the later the production decline occurs. When the fracture spacing is 3 times larger, the maximum gas production decreases by about 48%. When the fracture half-length is increased by 50 m, the initial production would nearly be doubled. The permeability evolution includes three stages: loss, recovery, and enhancement. When the fracture compressibility coefficien

关键词： Gas adsorption

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A Study on the Performances and Parameter-Dependence of Water-Alternating-Gas Flooding for Conglomerate Reservoirs

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Fluid Dynamics & Materials Processing 2025年第2期21卷 293-308页

作者： Haishui Han Jian Tan Junshi Li Changhong Zhao Ruoyu Liu Qun Zhang Zemin Ji Hao Kang CNPC Advisory Center CNPCBeijing100724China Fengcheng oilfield Operation Area of petrochina Xinjiang Oilfield CompanyPetroChinaKaramay834000China State Key Laboratory of Enhanced Oil Recovery PetroChinaBeijing100083China Research Institute of Petroleum Exploration and Development PetroChinaBeijing100083China Polytechnic Institute Hebei Normal UniversityShijiazhuang050000China Hebei Provincial Key Laboratory of Information Fusion and Intelligent Control Shijiazhuang050000China

To address the water sensitivity of conglomerate reservoirs,a series of core sensitivity tests were conducted to evaluate the effects of varying ionic *** findings serve as a foundation for improving reservoir fluid dynamics and optimizing the concentration of anti-swelling agents in water flooding *** experiments revealed a marked disparity in response between cores with differing *** Core No.5,characterized by low permeability,a 0.5% anti-swelling agent achieved only a modest 7.47% reduction in water ***,in the higher-permeability Core No.8,a 5%anti-swelling agent significantly reduced the water sensitivity index by 44.84% while enhancing ***,two displacement strategies-gas flooding following water flooding and water flooding after gas injection-were tested to assess the potential of CO_(2)water-alternating-gas(WAG)***_(2)injection after water flooding in Core No.5 increased oil recovery by 9.24%,though gas channeling,evidenced by a sharp rise in the gas-liquid ratio,emerged as a critical *** Core No.8,water flooding following gas injection failed to improve recovery,likely due to pronounced water sensitivity,reduced permeability,and the formation of dominant flow channels under high displacement pressure,which limited sweep efficiency.

关键词： Water sensitivity conglomerate reservoir water flooding WAG CO_(2)drive

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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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Factors controlling the formation and evolution of source rocks in the Shahezi Formation,Xujiaweizi fault depression,Songliao Basin

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Energy Geoscience 2023年第2期4卷 1-16页

作者： Xiang Zhou Lidong Sun Exploration and Production Research Institute PetroChina Daqing Oilfield CompanyDaqingHeilongjiang163712China

The types and quality of source rocks in the Shahezi Formation are the key factors affecting the distributions of various deep gas reservoirs in the Xujiaweizi fault depression in Songliao *** clarify the quality differences and origins of different types of source rocks in the Shahezi Formation,this study reconstructed the sedimentary and water environment,determined the controlling effects of fault activity,sedimentary facies,and paleo-sedimentary environment on the quality of various source rocks,by making full use of seismic,logging,core,organic geochemical and element geochemical *** results show that two types of source rocks developed in the Shahezi Formation,namely,mudstones and *** mudstones have a relatively high abundance of organic matter,which consists of type-Ⅱ kerogen and partial type-Ⅲ kerogen,and are concentrated in Sha-I *** coals have a high abundance of organic matter,which consist of type-Ⅲ kerogen,and are mainly distributed in Sha-Ⅱ *** the deposition of Sha-I Member,intense fault activity formed arrow,deep-water lacustrine basins with high salinity and strong reducibility on the downthrow sides of *** the deposition of Sha-II Member,fault activity progressively weakened,and the areas of lacustrine basins enlarged to their maximum values and became wide,shallow-water basins with low salinity and low *** development of source rocks was controlled by fault activity,sedimentary facies,and paleo-sedimentary *** activity formed accommodation space on the downthrown sides of faults for mudstone accumulation,thus determining mudstone *** sedimentary environment controlled the organic matter input and determined the distribution of mudstones and *** paleo-sedimentary environment,which consisted of paleo-salinity,as well as paleo-water depth and redox conditions,affected the accumulation and preservation of organic matter and is the main controlling factor for the

关键词： Fault Paleo-environment evolution Source rock Deep gas reservoirs Shahezi Formation Xujiaweizi fault depression

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Why Can China Realize the Continental“Shale Oil Revolution”?

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Journal of Earth Science 2022年第5期33卷 1324-1327页

作者： Caineng Zou Zhi Yang Guoxin Li Jianzhong Li Xianyang Liu Yong Tang Tao Jiang Yu Yang Xuefeng Bai Songqi Pan Minghui Lu Zhengdong Lei Bo Cai petrochina Research Institute of Petroleum Exploration and Development Beijing 100083China petrochina Qinghai oilfield company Dunhuang 736202China petrochina Tuha oilfield company Hami 839009China petrochina Changqing oilfield company Xi'an 710018China petrochina Xinjiang oilfield company Karamay834000China petrochina Jilin oilfield company Songyuan138000China petrochina Southwest Oil and gas field company Chengdu610000China petrochina daqing oilfield Comapny Ltd. Daqing163712China

0 INTRODUCTION Continental shale oil is a strategic alternative resource to ensure the safety of national oil supply and improve the level of industrial *** is a large country of continental oil resources,accounting for 90%of the total onshore oil resources;and China is also a major producer of continental oil,accounting for about 93%of the total oil production(Yang et al.,2019;Jia et al.,2018).

关键词： Continental shale accounting

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Viscoelasticity of mixed polyacrylamide solution

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Journal of Central South University 2008年第S1期15卷 443-446页

作者：徐丽娜 petrochina daqing oilfield Engineering Co.Ltd

The viscoelastic behavior of polyacrylamide solution is crucial for its application in various *** mixed polyacrylamide solution was prepared by mixing polyacrylamide with different relative molecular masses according to the defined mass *** viscosity and elasticity of mixed polyacrylamide solution were separately tested with RS150 rheometer and capillary breakup extensional rheometer and compared with those of the single polyacrylamide solution which is directly provided by manufacturer without any *** results indicate that the mixed and single polyacrylamide solutions have the same shear viscosity and intrinsic ***,some mixed polyacrylamide solutions have higher elasticity than single polyacrylamide *** flow resistance of mixed polyacrylamide with higher elasticity is also greater than that of single polyacrylamide solution in porous *** paper presents an effective method of mixing polyacrylamides with different relative molecular masses,which can enhance the elasticity of polyacrylamide solution and flowing resistance through porous medium.

关键词： polyacrylamide viscosity elasticity flow resistance

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