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

作　　者：巩磊[1,2] 程宇琪 高帅[1,2] 高志勇[3] 冯佳睿[3] 王洪涛[4] 宿晓岑 卢崎 王杰 Gong Lei;Cheng Yuqi;Gao Shuai;Gao Zhiyong;Feng Jiarui;Wang Hongtao;Su Xiaocen;Lu Qi;Wang Jie(Bohai-Rim Energy Research Institute,Northeast Petroleum University,Qinhuangdao 066004,China;College of Geosciences,Northeast Petroleum University,Daqing 163318,China;Petroleum Geology Research and Laboratory Center,PetroChina Research Institute of Petroleum Exploration and Development,Beijing 100083,China;Daqing Information Technology Research Center,Daqing 163318,China)

机构地区：[1]东北石油大学环渤海能源研究院,河北秦皇岛066004 [2]东北石油大学地球科学学院,黑龙江大庆163318 [3]中国石油勘探开发研究院实验中心,北京100083 [4]大庆市信息技术研究中心,黑龙江大庆163318

出　　处：《地球科学》2023年第7期2475-2488,共14页Earth Science

基　　金：国家自然科学基金项目(Nos.42072155,41902150);黑龙江省优秀青年科学基金项目(No.YQ2021D006);黑龙江省普通本科高等学校青年创新人才培养计划(No.UNPYSCT-2020147);黑龙江省博士后科研启动金(No.LBH-Q21001);中国石油“十四五”上游领域前瞻性基础性课题(No.2021DJ0302).

摘　　要：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.The Lower Jurassic in eastern Kuqa foreland basin is a fractured tight sandstone reservoir.The distribution of natural fractures controls hydrocarbon accumulation and single well productivity.Fracture connectivity is a key factor affecting porosity and permeability performance,productivity of tight reservoirs and cap integrity,but it lacks in systematic research on quantitative characterization methods of fracture connectivity and its influencing factors.Taking the Lower Jurassic tight sandstone reservoirs in eastern Kuqa foreland basin as an example,in this paper it analyzes the fracture development characteristics,quantitatively characterizes the fracture connectivity using a fracture node types and their proportions based method,and analyzes the controlling factors of fracture connectivity using numerical simulation.There are three types of microfractures in the study area:intragranular microfractures,grain-edge microfractures and intergranular microfractures.From west to east,fracture connectivity deteriorates gradually,which is consistent with fracture development intensity.Fracture azimuth dispersion,fracture length,fracture density and angle between fracture sets are the main factors affecting fracture connectivity.With the increase of fracture azimuth dispersion,fracture length,fracture density and angle between fracture sets,fracture connectivity becomes better.

关 键 词：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. 

分 类 号：P618.13[天文地球—矿床学]