Control and prediction of bedding-parallel fractures in fine-grained sedimentary rocks:A case from the Permian Lucaogou Formation in Jimusar Sag,Junggar Basin,Western China  

作　　者：Zhao-Hui Zhang Teng Zhang Hua-Qing Liu Xiang-Bo Li Duo-Nian Xu 

机构地区：[1]Xinjiang Key Laboratory for Geodynamic Processes and Metallogenic Prognosis of the Central Asian Orogenic Belt,Urumqi,830046,Xinjiang,China [2]School of Geology and Mining Engineering,Xinjiang University,Urumqi,830046,Xinjiang,China [3]YuanWangJingSheng Technology(Beijing)Co.Ltd.,Beijing,100083,China [4]Northwest Branch,Research Institute of Petroleum Exploration and Development,PetroChina,Lanzhou,730020,Gansu,China

出　　处：《Petroleum Science》2024年第6期3815-3838,共24页石油科学(英文版)

基　　金：financially supported by the National Natural Science Foundation of China(No.41872116);National Science and Technology Major Project(No.2017ZX05001-003);Initial Scientific Research Foundation of Xinjiang University for Doctor(No.620321016);Research Foundation of Tianchi Outstanding Doctor(No.51052300560)。

摘　　要：The fine-grained sedimentary rocks have numerous bedding-parallel fractures that are essential for the migration,enrichment,and efficient development of oil and gas.However,because of their variety and the complexity of the factors that affect them,their spatial prediction by the industrial community becomes challenging.Based on sample cores,thin sections,and well-logging and seismic data,this study employed a multi-scale data matching approach to quantitatively predict the development of bedding-parallel fractures and investigate their spatial distribution.Bedding-parallel fractures in the Lucaogou Formation in Jimusar Sag frequently occur along preexisting bedding planes and lithological interfaces.Unfilled bedding-parallel fractures inside or near source-rocks exhibit enhanced oil-bearing capacity.They were identified on micro-resistivity scanning images by the presence of regularly continuous black or nearly black sinusoidal curves.Overall,the developmental degree of bedding-parallel fractures was positively related to the brittle mineral and total organic carbon contents and negatively related to single reservoir interval thickness.The maintained porosity of the reservoir matrix contributed to a thorough response to factors affecting the development of bedding-parallel fractures.Here,an effective and objective method was proposed for predicting the development and distribution of bedding-parallel fractures in the fine-grained sedimentary rocks.The method was based on the matched reservoir interval density,reservoir interval density,and matched sweet spot density of bedding-parallel fractures.The prediction method integrated the significant advantages of high vertical resolution from logging curves and strong lateral continuity from seismic data.The average relative prediction error was 8%in the upper sweet spot in the Lucaogou Formation,indicating that the evaluation parameters for bedding-parallel fractures in fine-grained sedimentary rocks were reasonable and reliable and that the proposed prediction metho

关 键 词：Bedding-parallel fractures Fine-grained sedimentary rocks Multiscale matching Quantitative prediction Lucaogou formation Junggar Basin 

分 类 号：TE34[石油与天然气工程—油气田开发工程] P618.13[天文地球—矿床学]