油气地质与采收率2025，Vol.32Issue(2)：36-50,15.DOI:10.13673/j.pgre.202501021
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 Es4 to lower Es3 in Boxing Subsag
摘要
Abstract
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 hetero-geneity,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 fractur-ing operations,the interference between wellbore fracture networks and difficulties in fracturing key intervals directly hinder hydro-carbon exploration and development of Boxing Subsag.The Upper Submember of the 4th Member of the Eocene Shahejie Formation(Es4U)to the Lower Submember of the 3rd Member of the Eocene Shahejie Formation(Es3L)(Es4U-Es3L)were taken as research ob-jects,and mechanical experiments,logging interpretation,and seismic attribute analysis were integrated to construct a heteroge-neous rock mechanics parameter model and determine the in-situ stress state of individual wells.Based on the finite element geome-chanical 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 Es4U-Es3L falls into Class I but varies with depth in some areas.The maximum horizontal princi-pal 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 compression.The main controlling factors for in-situ stress field distribution include reservoir lithology,structural morphology,and faults.Reservoir lithology results in uneven dis-tribution of in-situ stress due to different mechanical properties of rock,and structural morphology influences in-situ stress proper-ties.Faults lead to chaotic in-situ stress directions,with stress concentrations at fault tips and bends.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Key words
in-situ stress state of individual well/heterogeneous rock mechanics parameter/in-situ stress field simulation/reservoir fracturing/Boxing Subsag分类
石油、天然气工程引用本文复制引用
刘士林,张鹏飞,邱贻博,冯建伟,刘水珍..博兴洼陷沙四段上亚段—沙三段下亚段地应力特征[J].油气地质与采收率,2025,32(2):36-50,15.基金项目
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). （41572124）
