渤海湾盆地渤中19⁃6气田变质岩潜山储层三维岩石力学参数求取及意义  

Calculation of 3D Reservoir Rock Mechanical Parameters of Metamorphic Rock Reservoirs in the Bozhong 19⁃6 Gas Field of the Bohai Bay Basin and Their Significance

作　　者：张冠杰 程奇 张雷 刘文超 赵雨佳 吴昊 沈传波[1] Zhang Guanjie;Cheng Qi;Zhang Lei;Liu Wenchao;Zhao Yujia;Wu Hao;Shen Chuanbo(Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education,China University of Geosciences,Wuhan 430074,China;Bohai Oilfield Research Institute,Tianjin Branch,CNOOC China Limited,Tianjin 841000,China)

机构地区：[1]中国地质大学构造与油气资源教育部重点实验室,湖北武汉430074 [2]中海石油(中国)有限公司天津分公司渤海石油研究院,天津841000

出　　处：《地球科学》2025年第2期551-568,共18页Earth Science

基　　金：湖北省自然科学基金创新群体项目(No.2021CFA031).

摘　　要：为明确渤海湾盆地渤中19-6气田变质岩潜山储层岩石力学参数特征,为该区后续地应力场及储层裂缝数值模拟提供可靠的基础数据,开展了三轴抗压试验、巴西劈裂试验以及三轴抗剪试验,并利用阵列声波曲线计算单井动态岩石力学参数,通过动态−静态校正,确定静态岩石力学参数单井分布特征;再利用叠前地震多属性检测方法反演三维非均质岩石力学参数,明确岩石力学参数空间分布特征.在此基础上,结合物性测试、全岩矿物分析以及压汞试验资料,探讨岩石力学参数主控因素,并基于静态岩石力学参数构建裂缝发育指数和岩性相互关系的判别图版.结果表明,渤海湾盆地渤中19-6气田变质岩潜山储层杨氏模量主要介于20~60 GPa,泊松比主要介于0.15~0.25,抗张强度主要介于5~15 MPa,内摩擦角主要介于30°~50°,岩石力学参数平面分布具有较强的非均质性,垂向分布主要与构造特征和风化作用强弱有关,并在一定程度上反映了储层物性特征.储层物性、不同类型矿物含量以及孔隙半径是岩石力学参数的主要控制因素,变质岩潜山储层具有裂缝发育程度高、岩性复杂的特点,难以通过常规方法准确识别储层裂缝与岩性,而通过静态岩石力学参数构建的裂缝发育指数、岩性判别图版对变质岩潜山储层裂缝发育程度评价、复杂岩性划分具有较好的指导意义.Triaxial compaction test,Brazilian test,and triaxial shear test were conducted to characterize the rock mechanical parameters of buried-hill reservoirs in the metamorphic rocks of Bozhong 19-6 gas field in Bohai Bay Basin and to provide reliable basic data for subsequent numerical simulation of ground stress field and reservoir fractures in this region.Single-well dynamic rock mechanical parameters were computed using array acoustic curves,and the single-well distributions of static rock mechanical parameters were determined via dynamic-static calibration;Prestack seismic multiattribute detection was adopted to deterministically inverse 3D heterogeneous rock mechanical fields and clarify the spatial distribution of rock mechanical parameters.On this basis,physical property test,whole-rock mineral analysis and mercury intrusion testing data were used to analyze the main control factors on the rock mechanical parameters.Then the fracture development index and lithological identification charts were built using static rock mechanical parameters.It was found the metamorphic buried-hill reservoirs in Bozhong 19-6 gas field of Bohai Bay Basin had Young′s modulus within 20 to 60 GPa,Poisson′s ratio within 0.15 to 0.25,tensile strength within 5 to 15 MPa,and internal friction angle within 30°to 50°.The horizontal distributions of the rock mechanical parameters were highly heterogeneous,and their vertical distributions were mainly related to tectonic properties and the weathering effect,and reflected the physical properties of reservoirs to some extent.Reservoir physical properties,concentrations of different minerals,and pore radius were the main controlling factors of the rock mechanical parameters.The metamorphic buried-hill reservoirs were featured by well-developed fractures,and complex lithology,and the reservoir fractures and lithology cannot be accurately identified using routine methods.In comparison,the fracture development index,and lithological identification charts built on basis of static rock mechanic

关 键 词：渤海湾盆地 渤中19-6气田 静态岩石力学参数 空间分布 主控因素 裂缝 石油地质 

分 类 号：P121[天文地球—天体测量]