库车前陆盆地东部下侏罗统致密砂岩储层裂缝连通性表征及其主控因素
巩磊 , 程宇琪 , 高帅 , 高志勇 , 冯佳睿 , 王洪涛 , 宿晓岑 , 卢崎 , 王杰
地球科学 ›› 2023, Vol. 48 ›› Issue (07) : 2475 -2488.
库车前陆盆地东部下侏罗统致密砂岩储层裂缝连通性表征及其主控因素
Fracture Connectivity Characterization and Its Controlling Factors in Lower Jurassic Tight Sandstone Reservoirs of Eastern Kuqa Foreland Basin
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库车前陆盆地东部下侏罗统为裂缝性致密砂岩储层,天然裂缝的分布控制了油气聚集和单井产能.裂缝连通性是影响致密储层孔渗性能、产能以及盖层完整性的关键因素,但是对于裂缝连通性定量表征方法及其影响因素缺少系统研究.以库车前陆盆地东部依奇克里克构造带下侏罗统致密砂岩储层为例,分析了其裂缝发育特征,利用基于裂缝节点类型及比例的方法对裂缝连通性进行定量表征,并利用数值模拟对裂缝连通性影响因素进行分析.研究区发育粒缘缝、粒内缝和穿粒缝3种微观裂缝类型.从西向东,裂缝连通性逐渐变差,与裂缝发育强度具有一致性.裂缝方位分散度、裂缝长度、裂缝密度以及组间夹角是影响裂缝连通性的主要因素.随着裂缝方位分散度、裂缝长度、裂缝密度以及组间夹角的增加,裂缝连通性变好.
库车前陆盆地东部 / 裂缝连通性 / 定量表征 / 控制因素 / 致密砂岩 / 石油地质学
eastern Kuqa foreland basin / fracture connectivity / quantitative characterization / controlling factor / tight sandstone / petroleum geology
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国家自然科学基金项目(42072155;41902150)
黑龙江省优秀青年科学基金项目(YQ2021D006)
黑龙江省普通本科高等学校青年创新人才培养计划(UNPYSCT-2020147)
黑龙江省博士后科研启动金(LBH-Q21001)
中国石油“十四五”上游领域前瞻性基础性课题(2021DJ0302)
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