鄂尔多斯盆地庆城油田长7页岩油储层多尺度裂缝三维地质建模  

Three-dimensional modeling of multiscale fractures in Chang 7 shale oil reservoir in Qingcheng oilfield,Ordos Basin

作　　者：刘艳祥 吕文雅[2,3] 曾联波[2,3] 李睿琦[4] 董少群 王兆生 李彦录[2,3,6] 王磊飞 冀春秋 LIU Yanxiang;L Wenya;ZENG Lianbo;LI Ruiqi;DONG Shaoqun;WANG Zhaosheng;LI Yanlu;WANG Leifei;JI Chunqiu(Liaoning Key Laboratory of Green Development of Mineral Resources,Liaoning Technical University,Fuxin 123000,China;National Key Laboratory of Petroleum Resources and Engineering,China University of Petroleum(Beijing),Beijing 102249,China;College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China;Research Institute of Exploration and Development,PetroChina Changqing Oilfield Branch Company,Xi’an 710018,China;College of Science,China University of Petroleum(Beijing),Beijing 102249,China;Longdong Oil and Gas Development Company of Changqing Oilfield,PetroChina,Qingyang 745000,China)

机构地区：[1]辽宁工程技术大学辽宁省矿产资源绿色开发重点实验室,辽宁阜新123000 [2]中国石油大学(北京)油气资源与工程全国重点实验室,北京102249 [3]中国石油大学(北京)地球科学学院,北京102249 [4]中国石油长庆油田分公司勘探开发研究院,陕西西安710018 [5]中国石油大学(北京)理学院,北京102249 [6]中国石油长庆油田陇东油气开发分公司,甘肃庆阳745000

出　　处：《地学前缘》2024年第5期103-116,共14页Earth Science Frontiers

基　　金：中国石油战略合作科技专项(ZLZX2020-02);国家自然科学基金项目(42002135);辽宁省矿产资源绿色开发重点实验室开放重点基金项目(LNTU/GDMR-2303)。

摘　　要：页岩油储层普遍发育多尺度天然裂缝,天然裂缝是页岩油储层主要的储集空间和渗流通道,多尺度天然裂缝分布规律制约着页岩油气储层高效开发。本文以鄂尔多斯盆地庆城油田长7页岩油储层为例,结合地表露头、岩心、薄片、测井和地震等资料,在划分多尺度裂缝的基础上,明确了多尺度裂缝的发育特征,形成了多尺度裂缝建模方法,建立了典型区块X井区长71储层多尺度裂缝三维离散网络模型。根据蚂蚁体叠后地震属性明确了大尺度裂缝分布特征,用确定性方法建立了大尺度裂缝地质模型;结合储层地质力学方法和常规测井裂缝解释结果,建立了中、小尺度裂缝发育强度约束体,然后以发育强度约束体为约束,协同中、小尺度裂缝参数,采用随机建模方法分别建立了中、小尺度裂缝地质模型。最终将大、中、小尺度裂缝网络模型融合形成多尺度裂缝网络模型,并建立裂缝等效属性模型。结果表明X井区长71大尺度裂缝发育于该区东北部,中尺度裂缝和小尺度裂缝多发育于该区西部、西南部和东北部大尺度裂缝发育位置。建立的多尺度裂缝模型与单井裂缝发育规律和实际生产动态数据吻合,可为庆城地区X井区页岩油气增储上产提供地质依据。Shale oil reservoirs generally develop multiscale natural fractures which are the main reservoir storage spaces and seepage channels.The development of multiscale natural fractures restricts efficient reservoir exploration and development.In this article,taking Chang 7 shale oil reservoir in Qingcheng oilfield,Ordos Basin as an example,combined with field surface outcrop,core,thin section,well log,and seismic data,the characteristics of multiscale fracture development are clarified on the basis of fracture classification;a multiscale fracture modeling method is developed.A three-dimensional discrete network model of multiscale fractures in well X in typical drilling area is established.Based on ant-tracking seismic attributes after stacking,the distribution characteristics of macroscale fractures are clarified,and a geological model of macroscale fractures is established using deterministic methods.Through geomechanical analysis,combined with fracture interpretation results from conventional well logging,intensity constraint models for mesosccale/small-scale fracture developments are established.Using the intensity constratint models,combined with relavant fracture parameters,geological models of mesoscale and small-scale fractures are established,respectively,using random modeling technique.Finally,fracture network models of all scales are fused to form a multiscale fracture network model,and an equivalent fracture attribute model is established.It was found that macroscale fractures of Chang 71 in area X are developed in the northeast while mesoscale and small-scale fractures are developed mostly in the west,southwest,and northeast of the study area.The established multiscale fracture model is consistent with the pattern of fracture development in single well and actual production performance data,thereby providing a geological basis for increasing shale oil and gas storage and production in well X drilling area in Qingcheng oilfield.

关 键 词：页岩油储层 多尺度裂缝 发育特征 三维离散网络模型 庆城油田 鄂尔多斯盆地 

分 类 号：P618.13[天文地球—矿床学] TE122.2[天文地球—地质学]