塔里木盆地玉北地区奥陶系岩溶作用  

Karstification of the ordovician in Yu Bei area,Tarim Basin

作　　者：吴礼明[1] 蒋海军[1] 林新[1] 谭广辉[1] 

机构地区：[1]中国石化西北油田分公司勘探开发研究院,新疆乌鲁木齐830011

出　　处：《新疆地质》2015年第4期504-509,共6页Xinjiang Geology

基　　金：中石化股份有限公司重大先导项目塔里木盆地塔中;玉北地区油气富集规律研究与突破目标(2013KTXD01)资助

摘　　要：奥陶系是塔里木盆地玉北地区海相碳酸盐岩油气勘探的重要目的层和产层。由于埋深大,勘探程度低,对储层方面认识有待进一步研究。通过钻井岩心、成像测井,结合岩石薄片、铸体薄片、阴极发光等资料,对玉北地区奥陶系岩溶作用类型和期次进行研究。结果表明,准同生溶蚀作用主要发育于良里塔格组沉积末期,为第一期方解石胶结物的溶解,偶见粒内溶孔、铸模孔和粒间溶孔,是后期溶蚀作用的基础。表生岩溶作用具多期次特点,其中加里东晚期至海西早期,岩溶作用最强,为奥陶系碳酸盐岩储层储集空间的主要形成期。埋藏溶蚀作用与油气活动带来的有机酸等物质有关,主要发育海西晚期和喜山期埋藏岩溶,具形成的溶蚀孔洞多不被方解石充填或半充填特征,是现今储层的有效储集空间。The Ordovician becomes the target and production stratum for oil and gas exploration of marine carbonate rocks in Yu Bei area,Tarim Basin.Due to the deep burial and low degree of exploration,the cognition of its origin is not perfect and need to be further studied.Based on the drilling cores,imaging logging data,combined with rock and cast thin slice,cathodoluminescence, the type and period of karstification were analyzed.Penecontemporaneous karstification occurred in the late of sedimentary of Lianglitage Formation is the basis for later karstification, demonstrating with the dissolution of first cements and the appearance of intragranular dissolved pore,moldic pore and intergranular dissolved pore.Supergene karstification has the characteristics of multi period,and between the late Caledonian to Early Hercynian,karstification which is most intense,is the main formation period of reservoir space in Ordovician carbonate rock.Burial dolomitization which has the relation with activities of oil and gas,can be divided into two main periods as the late Hercynian and Himalayan.And the dissolve pores which have not been filled with calcite or partly filled,is the effective reservoir space of current reservoir.

关 键 词：玉北地区 储层特征 准同时岩溶 表生岩溶 埋藏岩溶 

分 类 号：P618.13[天文地球—矿床学]