塔里木盆地古城地区上寒武统碳酸盐岩储层发育特征及主控因素  

Characteristics and main controlling factors of Upper Cambrian carbonate reservoir in Gucheng area,Tarim Basin,NW China

作　　者：王珊[1] 曹颖辉[1] 张亚金[2] 杜德道[1] 齐井顺[2] 白莹[1] 闫磊[1] 杨敏[1] 张君龙[2] WANG Shan;CAO Ying-hui;ZHANG Ya-jin;DU De-dao;QI Jing-shun;BAI Ying;YAN Lei;YANG Min;ZHANG Jun-long(PetroChina Research Institute of Petroleum Exploration&Development,Beijing 100083,China;PetroChina Daqing Oilfield Company,Daqing 163712,China)

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712

出　　处：《天然气地球科学》2020年第10期1389-1403,共15页Natural Gas Geoscience

基　　金：中国石油天然气股份有限公司“十三五”专项“古老碳酸盐岩油气成藏分布规律与关键技术”(编号:2019B-04);中国石油重大科技专项“塔东天然气成藏理论及勘探配套技术研究”(编号:2016E-0204)联合资助.

摘　　要：古城地区下古生界碳酸盐岩是塔里木盆地塔东探区重点勘探领域。近年来古城6井、古城8井、古城9井相继在中下奥陶统白云岩中获高产气流,展现了该区良好的勘探潜力,而针对寒武系钻探的城探1井、城探2井均未取得突破。白云岩储层的成因及主控因素成为制约寒武系碳酸盐岩勘探的关键因素之一。在前人研究基础之上,结合岩心观察、薄片鉴定、同位素、主微量元素等各种地球化学分析,对古城地区上寒武统碳酸盐岩储层进行了深入研究。古城地区上寒武统碳酸盐岩储层主要发育在白云岩中,岩性以颗粒云岩、藻(礁)微生物云岩、角砾云岩以及晶粒云岩为主。储集空间以粒间溶孔、粒内溶孔,晶间孔、晶间溶孔及溶蚀孔洞为主。研究区上寒武统储层分为4类,包括颗粒云岩孔隙型储层、角砾云岩裂缝—孔洞型储层、结晶云岩孔隙型储层以及结晶云岩裂缝—孔洞型储层。研究表明礁滩相沉积是储层发育的物质基础;准同生期溶蚀作用和白云石化作用为储层形成的关键;埋藏—热液溶蚀作用是储层发育的重要补充。The Lower Paleozoic carbonate rock in Gucheng area is a significant exploration area in eastern Tarim Basin.In recent years,Gucheng 6,Wells Gucheng 8 and Gucheng 9 have obtained high capacity gas flow in the Middle and Lower Ordovician dolomite reservoir,which shows good exploration potential in this area.But Wells Chengtan1 and Chengtan 2 aiming at Cambrian have made no breakthrough.The main controlling factor of dolomite reservoir has become one of the critical problems restricting the exploration of Cambrian carbonate rocks.On the basis of previous studies,the Upper Cambrian carbonate reservoir in Gucheng area has been deep studied in combination with core description,thin section observation,isotope analysis,main and trace ele⁃ments analysis and other geochemical analysis.The Upper Cambrian carbonate reservoir in Gucheng area is mainly developed in dolostone.The lithologies are mainly grain dolomite,algae(reef)microbial dolomite,brec⁃cia dolomite and crystalline dolomite.The main reservoir spaces are intergranular dissolved pores,intragranular dissolved pores,intercrystalline dissolved pores and dissolved caves.The Upper Cambrian reservoirs in the study area can be divided into four types,including grain dolomite pore reservoir,crystalline dolomite pore res⁃ervoir,breccia dolomite fracture-pore reservoir and crystalline dolomite fracture-pore reservoir.Reef-shoal fa⁃cies are the material basis of dolostone reservoir;dissolution and dolomitization in the penecontemporaneous pe⁃riod is the key to reservoir formation and burial-hydrothermal dissolution is an important complement to reser⁃voir development.

关 键 词：塔里木盆地 古城地区 上寒武统 碳酸盐岩储层 储层特征 储层主控因素 

分 类 号：TE122.22[石油与天然气工程—油气勘探]