塔里木盆地塔中东部潜山区上寒武统白云岩储集层特征与主控因素  

Characteristics and controlling factors of the Upper Cambrian dolomite reservoir in buried hill area on the East of Tazhong

作　　者：王晓雪 熊益学 陈永权[1] 刘鑫[1] 黄金华[1] 胡方杰[1] 房璐[1] 王新新[1] 罗海宁[1] WANG Xiao-xue;XIONG Yi-xue;CHEN Yong-quan;LIU Xin;HUANG Jin-hua;HU Fang-jie;FANG Lu;WANG Xin-xin;LUO Hai-ning(Research Institute of Exploration and Development,PetroChina Tarim Oilfield Company,Korla 841000,China;School of Petroleum Engineering,Chongqing University of Science&Technology,Chongqing 401331,China)

机构地区：[1]中国石油塔里木油田分公司,新疆库尔勒841000 [2]重庆科技学院石油与天然气工程学院,重庆401331

出　　处：《天然气地球科学》2020年第10期1404-1414,共11页Natural Gas Geoscience

基　　金：国家科技重大专项课题“塔里木盆地台盆区深层有利区带与目标评价”(编号:2017ZX05008-005-004);“塔里木盆地奥陶系—前寒武系成藏条件研究与区带目标评价”(编号:2016ZX05004-004);重庆科技学院科研资助项目(编号:ckrc2019048)联合资助.

摘　　要：下古生界白云岩潜山是塔里木盆地油气勘探的重要领域之一。位于塔中25构造带的G58井在上寒武统下丘里塔格组白云岩测试中获得高产油气流,揭示下古生界白云岩潜山具有广阔勘探前景,但目前对下丘里塔格组白云岩潜山优质储层分布规律仍不清楚,储层预测缺少有效的技术手段。通过采用野外剖面观察、单井资料分析、地震资料预测等方法,分析了塔中东部潜山区下丘里塔格组白云岩储集层的主控因素,并预测了优质储层的分布范围。研究表明:塔中25构造带储集层岩性可细分为砂屑白云岩、细晶白云岩及粉晶白云岩;储集空间为孔洞、孔隙、裂缝;储层物性表现出低孔低渗特点;储层孔隙结构为粗孔中等喉道特点;岩溶作用形成的古地貌残丘幅度控制了白云岩储层的厚度,构造作用形成的裂缝控制了主要储集空间和渗流通道。三维地震解释显示出研究区下丘里塔格组优质白云岩储层平面上呈现出由“两沟”隔挡成3段式特点,东段、中段与西段均表现为古地貌较高且裂缝发育程度高,是白云岩储层有利发育区。The Lower Paleozoic dolomite buried hill is one of the important fields of oil and gas exploration in Tarim Basin.The Well G58 located in Tazhong 25 structural belt obtained high-yield oil and gas flow in the do⁃lomite test of the lower Qiulitage Formation of the Upper Cambrian,which revealed that the Lower Paleozoic dolomite buried hill has a broad exploration prospect.However,the distribution rule of high-quality reservoir in the dolomite buried hill of the lower Qiulitage Formation is still unclear,and the reservoir prediction is lack ef⁃fective technical means.In this paper,field section observation,single well data analysis,seismic data predic⁃tion and other methods are used to analyze the main controlling factors of dolomite reservoir in the lower Qiul⁃itage Formation in the buried hill area in the east of Tazhong,and to predict the distribution range of high-quali⁃ty reservoir.The study shows that the reservoir lithology of Tazhong 25 structural belt can be divided into sand clastic dolomite,fine-grained dolomite and silty dolomite;the reservoir space is pore,pore and fracture;the physical properties of the reservoir show the characteristics of low porosity and permeability;the pore structure of the reservoir is the characteristics of coarse pore and medium throat;the range of paleogeomorphic residual hills formed by karst action controls the thickness of dolomite reservoir,and the fracture formed by tectonic ac⁃tion fractures controls the main reservoir space and seepage channel.Three dimensional seismic interpretation shows that the high-quality dolomite reservoir of the Lower Qiulitage Formation in the study area is divided into three sections by"two ditches".The eastern,middle and western sections all show high palaeogeomorphology and high fracture development degree,which is favorable for dolomite reservoir development.

关 键 词：塔里木盆地 塔中东部潜山 下丘里塔格组 白云岩 优质储层 主控因素 

分 类 号：TE122.2[石油与天然气工程—油气勘探]