博兴洼陷沙四段上亚段—沙三段下亚段地应力特征  

In-situ stress characteristics from upper Es_(4)to lower Es_(3)in Boxing Subsag

作　　者：刘士林 张鹏飞 邱贻博[3] 冯建伟 刘水珍 LIU Shilin;ZHANG Pengfei;QIU Yibo;FENG Jianwei;LIU Shuizhen(Oilfield Exploration and Development Department,SINOPEC,Beijing City,100728,China;Western Oil and Gas Exploration Project Department,Shengli Oilfield Company,SINOPEC,Dongying City,Shandong Province,257001,China;Exploration and Development Research Institute,Shengli Oilfield Company,SINOPEC,Dongying City,Shandong Province,257015,China;School of Resources and Geosciences,China University of Mining and Technology,Xuzhou City,Jiangsu Province,221116,China;School of Geosciences,China University of Petroleum(East China),Qingdao City,Shandong Province,266580,China)

机构地区：[1]中国石化油田勘探开发事业部,北京100728 [2]中国石化胜利油田分公司西部油气勘探项目部,山东东营257001 [3]中国石化胜利油田分公司勘探开发研究院,山东东营257015 [4]中国矿业大学资源与地球科学学院,江苏徐州221116 [5]中国石油大学(华东)地球科学与技术学院,山东青岛266580

出　　处：《油气地质与采收率》2025年第2期36-50,共15页Petroleum Geology and Recovery Efficiency

基　　金：国家自然科学基金项目“基于应力-耗能耦合模型的互层型致密砂岩裂缝定量预测研究”(41572124)。

摘　　要：东营凹陷博兴洼陷沙河街组油气资源丰富,勘探潜力大,但陆相页岩横向岩相变化快、储层非均质性强、地质结构复杂和埋藏深度大等特点,尤其多条断裂带的出现极大影响了地应力场的空间分布。同时在钻井过程中坍塌掉块、油气侵入等井下事故频发,储层压裂过程中井间缝网干扰大、重点层段压不开等技术难题直接制约博兴洼陷的油气勘探开发进程。以沙四段上亚段—沙三段下亚段(Es_(4)上—Es_(3)下)为研究对象,基于力学实验、测井解释和地震属性分析等多手段融合,构建非均质岩石力学参数体模型,确定单井地应力状态;在建立有限元地质力学模型的基础上,借助弹塑性有限元数值模拟手段,实现地应力场的空间表征,并分析地应力场分布差异的主控因素及机理。研究结果表明:博兴洼陷中西部构造活动持续时间长,主断层具有伸展-走滑特征,构造活动整体上呈从南向北、从洼陷中心向主断层附近迁移的趋势;Es_(4)上—Es_(3)下地应力状态整体处于Ⅰ类,但部分区域地应力状态仍随深度发生转换,水平最大主应力延伸趋势为由NE—WN呈大-小-大的变化过程,且地应力高值区主要分布于高青-平南断层拐角附近,以近EW向水平挤压为主。地应力场分布差异的主控因素主要包括储层岩性、构造形态和断层,储层岩性因岩石力学性质不同导致地应力分布不均,构造形态决定地应力性质,断层使地应力方向杂乱,在断层尖端、弯曲处发生应力集中。Shahejie Formation of Boxing Subsag in Dongying Sag is rich in hydrocarbon resources and holds significant exploration potential.However,the complex geological structure,rapid lateral lithological changes in lacustrine shales,strong reservoir heterogeneity,and significant burial depth pose substantial challenges.Multiple fault zones significantly affect the spatial distribution of the in-situ stress field,leading to frequent drilling issues such as collapse and fluid invasion.Additionally,during reservoir fracturing operations,the interference between wellbore fracture networks and difficulties in fracturing key intervals directly hinder hydrocarbon exploration and development of Boxing Subsag.The Upper Submember of the 4th Member of the Eocene Shahejie Formation(Es_(4) U)to the Lower Submember of the 3rd Member of the Eocene Shahejie Formation(Es_(3) L)(Es_(4) U-Es_(3) L)were taken as research objects,and mechanical experiments,logging interpretation,and seismic attribute analysis were integrated to construct a heterogeneous rock mechanics parameter model and determine the in-situ stress state of individual wells.Based on the finite element geomechanical model,the study employed elastoplastic finite element numerical simulations to characterize the in-situ stress field spatially and analyze the controlling factors and mechanisms of in-situ stress field distribution differences.Results indicate that the central western part of Boxing Subsag has experienced prolonged structural activity,with major faults exhibiting extension and strike-slip characteristics.The overall trend of structural activity is from the south to the north and from the subsag center towards major faults.The overall in-situ stress state of the Es_(4) U-Es_(3) L falls into Class I but varies with depth in some areas.The maximum horizontal principal stress shows an NE-WN extension of high,low,and high-value variation.High in-situ stress zones are mainly concentrated near the Gaoqing-Pingnan fault corner,dominated by nearly EW-trending horizontal

关 键 词：单井地应力状态 非均质岩石力学参数体 地应力场模拟 储层压裂 博兴洼陷 

分 类 号：TE122.2[石油与天然气工程—油气勘探]