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Effect of gravel on rock failure in glutenite reservoirs under different confining pressures

Petroleum Science 2023年第5期20卷 3022-3036页

作者： Jian-Tong Liu Jian-Bo Wang Hong-Kui Ge Wei Zhou Bei-Bei Chen Xiao-Di Li Xian-Jie Xue Sen-Lin Luo Department of Petroleum Engineering China University of Petroleum(Beijing)at KaramayKaramay834000XinjiangChina Unconventional Oil and Gas Institute China University of Petroleum(Beijing)Beijing102249China Xinjiang Oilfield Company China National Petroleum CorporationKaramay834000XinjiangChina

Due to the existence of gravel,glutenite is heterogeneous and different from fine-grained rocks such as sandstone and shale in *** fully understand the effect of gravel on failure mode in glutenite,we performed triaxial compression tests on different *** results indicate that failure modes of glutenite are complex due to the existence of *** different confining pressures,three failure modes were *** first failure mode,a tensile failure under uniaxial compression,produces multiple tortuous longitudinal *** this failure mode,the interaction between gravels provides the lateral tensile stress for rock *** second failure mode occurs under low and medium confining pressure and produces a crack band composed of micro-cracks around *** failure mode conforms to the Mohr-Coulomb criterion and is generated by shear *** this failure mode,shear dilatancy and shear compaction may occur under different confining pressures to produce different crack band *** the second failure mode,gravel-induced stress concentration produces masses of initial micro-cracks for shear cracking,and gravels deflect the fracture *** a result,the fracture is characterized by crack bands that are far broader than in fine-grained *** third failure mode requires high confining pressure and produces disconnected cracks around gravels without apparent crack *** this failure mode,the gravel rarely breaks,indicating that the formation of these fractures is related to the deformation of the *** third failure mode requires lower confining pressure in glutenite with weak cement and matrix ***,unlike fine-grained rocks,the failure mode of glutenite is not only controlled by confining pressure but also by the *** failure of glutenite is characterized by producing cracks around *** cracks are produced by different mechanisms and distributed in different manners under different confining

关键词： glutenite Heterogeneity Failure mode Triaxial compression test Shear dilatancy Shear compaction

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Quality evaluation of glutenite reservoirs of intergranular-secondary dissolution pore type using a quantitative method

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Energy Geoscience 2022年第2期3卷 126-133页

作者： Juanjuan Guo Yu Huang Yanjun Wang Jianguo Pan Linjun Huang Northwest Branch Institute Research Institute of Petroleum Exploration&DevelopmentPetroChinaLanzhouGansu730020China

glutenite(coarse-grained clastic)reservoirs of intergranularesecondary dissolution pore type are dominated by residual intergranular pores and secondary dissolution pores,and characterized by low porosity,low permeability,strong heterogeneity,and highly variable physical *** is difficult to conduct a quantitative quality assessment of these reservoirs while their primary control factors remain *** this paper,experimental core data and drilling,logging and seismic data are used to assess the effect of sedimentary facies on reservoir *** sedimentary facies zones are identified by analyzing the characteristics of glutenite reservoirs,which includes investigating rock components and their effects on reservoir *** matrix content and rigid particle content are identified as the primary control factors for these *** curves sensitive to reservoir quality are selected and examined to continuously characterize the physical parameters of the *** establishes a calculation model of reservoir assessment parameters through multivariate regression and determines the quantitative assessment parameter *** quality of the glutenite reservoirs is defined using conventional logging *** study also predicts the plane distribution of high-quality reservoirs through geostatistical inversion of the reservoir assessment parameters based on conventional wave impedance inversion,thus providing insight and guidance for quantitative assessment and quality prediction of glutenite reservoirs of the intergranular-secondary dissolution pore *** application of this method to well deployment based on qualitative evaluation of the glutenite reservoirs in oilfields yielded favorable results.

关键词： glutenite Reservoir quality Reservoir assessment parameter Geostatistical simulation and inversion Mahu Sag Junggar basin

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Distribution prediction of the glutenite in Member 3 of Triassic Xujiahe Formation in Yuanba area,northern Sichuan Basin

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Petroleum Research 2022年第1期7卷 123-130页

作者： Yanqing Huang Tian Lin Ai Wang Zeyu Nan Sinopec Petroleum Exploration and Development Research Institute Beijing100083China

Although the Triassic Xujiahe Formation in Yuanba area of northern Sichuan has a large amount of resources,the proportion of proved reserves to the amount of resources is *** of most of the pilot production wells is high at the initial stage,but it declines rapidly,mainly due to tight rock properties and strong heterogeneity of Xujiahe ***,it is important to investigate the distribution of high-quality *** Member 3 of Xujiahe Formation develops sandstone interbedded with mudstone,and its lateral thickness of different sandstone groups varies greatly,so it is a challenge to identify appropriate time windows for seismic attribute analysis,thus,so the prediction effect of the glutenite in the Member 3 of Xujiahe *** this study,through analysis of core data and logging facies,single-well sedimentary microfacies subdivision is carried ***-well lithological interpretation is also studied with application of lithological identification ***,lithological associations and its seismic responses at the top and bottom interfaces of each sandstone group in the Member 3 of Xujiahe Formation are well investigated,The lithological association with the glutenite above and the mudstone below the stratigraphic interface respectively,corresponds to a trough in seismic profiles;in this case,when extracting the seismic attributes of sandstone groups above the stratigraphic interface,only the difference of between drilling horizons and seismic horizons needs to be *** lithological association with the mudstone above and glutenite below the stratigraphic interface respectively,corresponds to a peak in seismic profiles;in this case,when extracting the seismic attributes of sandstone groups above the stratigraphic interface,influence of which should be eliminated;thus,a method of time window determination for seismic attribute extraction is *** amplitude,frequency,and phase attributes,the total peak energy ha

关键词： Braided river delta Time window Seismic attribute glutenite Xujiahe formation Sichuan basin

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Hydrocarbon Reservoir Model of glutenite in the Fourth Member of Shahejie Formation in Northern Dongying Depression

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地学前缘 2009年第S1期16卷 136-137页

作者： Hui Liu~(1,2),Yingchang Cao~3,Yanzhong Wang~3 1.State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences,Beijing 100083, China. 2.School of Energy Resources,China University of Geosciences(Beijing),Beijing 100083,China 3.Faculty of Geo-Resources and Information,China University of Petroleum,Dongying 257061,China

The glutenite in the fourth member of Shahejie Formation(Es^4) in northern Dongying depression straightforwardly penetrated into the muddy bathyal -abyss *** conditions of reservoir is very superior:(1) the high quality thick bedded oil source rock is developed very well in the Lijin sag and Minfeng sag of the study area,and it has the higher capability of generating hydrocarbon;(2) the

关键词： glutenite hydrocarbon reservoir formation northern Dongying depression fourth member of Shahejie Formation

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Formation of X-shaped hydraulic fractures in deep thick glutenite reservoirs:A case study in Bohai Bay Basin,East China

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Journal of Central South University 2021年第9期28卷 2814-2829页

作者： LI Zhi-chao LI Lian-chong WANG Shu-ren MA Shou ZHANG Zi-lin LI Ai-shan HUANG Bo ZHANG Liao-yuan WANG Zeng-lin ZHANG Quan-sheng School of Civil Engineering Henan Polytechnic UniversityJiaozuo 454003China School of Resources and Civil Engineering Northeastern UniversityShenyang 110819China SinoFTS Petroleum Services Ltd. Beijing 100101China Oil Production Technology Research Institute Shengli Oilfield Branch CompanyDongying 257000China

Tight glutenite reservoirs are widely developed in Bohai Bay Basin,East *** are mostly huge thick and rely on hydraulic fracturing treatment for commercial *** investigate the propagation behavior of hydraulic fractures in these glutenite reservoirs,the geological feature of reservoirs in Bohai Bay Basin is studied firstly,including the reservoir vertical distribution feature and the heterogeneous ***,hydraulic fracturing treatments in block Yan 222 are carried out and the fracturing processes are monitored by the microseismic *** show the hydraulic fractures generated in the reservoirs are mostly in X *** cause of X-shaped hydraulic fractures in this study is mainly ascribed to(I)the reservoir heterogeneity and(II)the stress shadow effect of two close hydraulic fractures propagating in the same orientation,which is confirmed by the following numerical simulation and related research in *** study can provide a reference for the research on the fracturing behavior of the deep thick glutenite reservoirs.

关键词： glutenite hydraulic fracture X shape reservoir heterogeneity gravel

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Genetic Mechanism of the Dolomite in Dolomitic glutenite of the Shahejie Formation—A Case Study of QHD 29-2 Oilfield in Bohai Bay Basin, China

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Open Journal of Geology 2019年第8期9卷 461-473页

作者： Liya Da Deying Wang Haibo Yu Jianmin Zhu Tianjin Branch CNOOC China Limited Tianjin China

The dolomite in dolomitic glutenite of the shahejie formation in the eastern steep slope of the Shijiutuo bulge in Bohai is a high-quality reservoir, and the content of dolomite is positively correlated with reservoir physical properties. In this paper, by using thin section, core, wall core, geochemical data and analyzing petrology and mineralogy characteristic, we systematically analyzed the paleogeographic environment and genetic mechanism of this kind of dolomite and established the genetic models. The dolomite in the glutenite body has many characteristics of development, which is formed by three kinds of genesis: quasi-synergy dolomitization, buried dolomitization and hydrothermal dolomitization. The dolomite in glutenite is produced in the form of matrix, grain (sandstone, oolith), biological skeleton (conch, ostracod), clastic shell and dolomite cement. The minor elements, carbon and oxygen isotopes, trace minerals and paleontological combinations reveal that the paleogeographic environment was closed continental salt-brackish water bay, the climate was arid and hot, and the evaporation was strong. It provides favorable conditions for the production of the dolomite in dolomitic glutenite. There are three genetic models of dolomite. The first model is penecontemporaneous dolomitization. The climate was arid and hot, the aragonite and high-magnesium calcite deposited with sand and gravel. Due to the effect of evaporation, dolomitization occurred. The second model is buried dolomitization. The water from dehydration of clay minerals causes the Mg2+ in the high-magnesium formation migrating into the rock, leading to the occurrence of dolomitization. The third model is hydrothermal dolomitization. Deep faults can bring geothermal fluids into the overlying reservoir and form the hydrothermal dolomite.

关键词： Genetic Mechanism of the Dolomite Dolomitic glutenite Shahejie Formation Eastern Steep Slope of Shijiutuo Bulge Bohai Bay Basin

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曲线形态定量化表征技术在砂砾岩储层评价中的应用

曲线形态定量化表征技术在砂砾岩储层评价中的应用

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2019油气田勘探与开发国际会议

作者：马超崔云江王培春中国海油(中国)有限公司天津分公司

砾砂岩油藏岩性复杂、地层非均质性强,岩性识别困难,对流体性质识别和储层参数等方面计算造成很大不确定性。本文基于新建立的岩性曲线,利其用曲线形态识别地层岩性界面。通过计算分段曲线的几何指示参数、分形指示参数,将曲线形态定量... 详细信息

砾砂岩油藏岩性复杂、地层非均质性强,岩性识别困难,对流体性质识别和储层参数等方面计算造成很大不确定性。本文基于新建立的岩性曲线,利其用曲线形态识别地层岩性界面。通过计算分段曲线的几何指示参数、分形指示参数,将曲线形态定量化并与岩心标定,建立了岩性识别标准,进而对砂砾岩储层有效性进行评价。该方法有效解决了JZ油田砾砂岩储层有效性评价难题,为今后其它类似储层研究提供了思路。

关键词： log shape fractal glutenite lithology identification effectiveness evaluation

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