准噶尔盆地沙湾凹陷三叠系超深层碎屑岩储层特征及主控因素——以征10井区克拉玛依组为例  

Characteristics and main controlling factors of triassic ultra-deep clastic rock reservoirs in Shawan Sag,Junggar Basin:A case study of Karamay Formation in Well Zheng10 area

作　　者：王捷 王千军[1] 郑胜 刘德志[1] 刘博奥[1] 徐天野 WANG Jie;WANG Qianjun;ZHENG Sheng;LIU Dezhi;LIU Boao;XU Tianye(Exploration and Development Research Institute,Shengli Oilfield Company,SINOPEC,Dongying City,Shandong Province,257015,China)

机构地区：[1]中国石化胜利油田分公司勘探开发研究院,山东东营257015

出　　处：《油气地质与采收率》2024年第4期164-173,共10页Petroleum Geology and Recovery Efficiency

基　　金：中国石化科技攻关项目“准噶尔盆地腹部超深层P-T成储成藏机制及勘探方向”(P22128);中国石化胜利油田分公司科技攻关项目“准中地区中-古生界重要不整合发育特征及控藏作用”(YKK2302)。

摘　　要：超深层碎屑岩储层由于埋藏深度大,储层物性一般较差,单井油气产能低,但中国石化探区沙湾凹陷近期钻探的征10井却在埋深6700m的三叠系克拉玛依组钻遇了优质厚层储层,常规测试即获得高产工业油气流。为了揭示该套储层的特征及有利储层主控因素,明确该地区超深层碎屑岩勘探方向,降低该区下步油气勘探的风险,通过岩心、测井、铸体薄片、物性、扫描电镜等资料综合分析,并结合储层成岩演化,探讨了该区三叠系克拉玛依组储层岩石学特征、物性特征、孔隙特征及有利储层主控因素。研究结果表明:征10井区三叠系克拉玛依组超深层碎屑岩为辫状河三角洲前缘沉积,岩性以砂砾岩、含砾细砂岩及细砂岩为主,岩石类型主要为长石岩屑砂岩,成分成熟度较低;储集空间类型以剩余原生孔隙与溶蚀孔隙为主,储层平均孔隙度为9.1%,平均渗透率为2.85mD,整体属于特低孔特低渗透及低孔低渗透储层。有利沉积相带、建设性成岩作用及异常高压共同控制了该区有利储层的发育及分布。其中,沉积微相是有利储层发育的基础,辫状河三角洲前缘水下分流河道中沉积的细砂岩分选及磨圆较好,泥质杂基含量低,储层物性较好,是有利储层发育的优势相带;早期成岩过程中产生的钠长石胶结物后期被酸性溶蚀使得溶蚀孔隙增加,是重要的建设性成岩作用;油气持续充注所形成的异常高压,形成时间早且长期持续发育,起到了重要的建设作用。研究成果对该地区下步超深层油气勘探具有指导作用。Due to large burial depths,ultra-deep clastic rock reservoirs have poor physical properties and low oil and gas productiv‐ity.However,the newly drilled Well Zheng10 in Shawan Sag,Sinopec exploration area,has encountered high-quality thick reser‐voirs in the Triassic Karamay Formation at a buried depth of 6700 m,and conventional tests have obtained high industrial oil and gas flow.To reveal the characteristics of this set of reservoirs and favorable main controlling factors,clarify the direction of ultra-deep clastic rock exploration,and reduce the risk of further oil and gas exploration in this area,this paper comprehensively ana‐lyzed the data of core,well logging,cast thin sections,physical properties,scanning electron microscopy,and diagenetic evolu‐tion of the reservoirs,and discussed the petrological,physical,and pore characteristics of reservoirs in the Triassic Karamay For‐mation in this area.The results show that the ultra-deep clastic rocks of the Triassic Karamay Formation in Well Zheng10 area are de‐posited in the front of the braided river delta.The lithology is dominated by glutenites,gravel-bearing fine sandstones,and fine sandstones,and the rock types are mainly feldspar lithic sandstones with low composition maturity.The remaining primary pores and solution pores dominate the reservoir space.The average porosity of the reservoirs is 9.1%,and the average permeability is 2.85 mD.The reservoir belongs to the ultra-low porosity and ultra-low permeability type and low porosity and low permeability type as a whole.Favorable sedimentary facies zones,constructive diagenesis,and abnormal high-pressure control the development and distri‐bution of favorable reservoirs in this area.Among them,sedimentary microfacies are the basis of favorable reservoir development.The fine sandstones deposited in the underwater distributary channel at the front of the braided river delta are better sorted and rounded.The contents of the muddy matrix are low,and the physical properties of the reservoir are better

关 键 词：超深层 碎屑岩 储层特征 主控因素 克拉玛依组 沙湾凹陷 

分 类 号：TE122.2[石油与天然气工程—油气勘探]