哈拉哈塘地区奥陶系岩溶古河道识别及其成藏意义  

Identification of Ordovician karstic paleochannels and its accumulation significance in Halahatang area

作　　者：代冬冬[1] 房启飞[1] 万效国[2] 蔡泉[2] DAI Dongdong;FANG Qifei;WAN Xiaoguo;CAI Quan(PetroChina Research Institute of Petroleum Exploration & Development-Northwest,Lanzhou 730020,China;Research Institute of Exploration & Development,PetroChina Tarim Oilfield Company,Korla 841000,Xinjiang,China)

机构地区：[1]中国石油勘探开发研究院西北分院,兰州730020 [2]中国石油塔里木油田分公司勘探开发研究院,新疆库尔勒841000

出　　处：《岩性油气藏》2017年第5期89-96,共8页Lithologic Reservoirs

基　　金："十三五"国家重大科技专项"大型油气田及煤层气开发"(编号:2016ZX05004-003)资助

摘　　要：哈拉哈塘地区奥陶系良里塔格组碳酸盐岩沉积后发生短暂暴露,形成了古喀斯特地貌,岩溶古河道有利于形成高产油气藏,但其复杂性带来了较高的勘探风险。综合利用地震、钻井、测井等资料,优化古河道河床侵蚀深度自动识别、RGB混频三原色、振幅属性提取及地震反射结构分析技术,在该区奥陶系碳酸盐岩中识别出6组明河河道和47条暗河河道。研究认为,储层发育与暗河系统类型关系密切,哈拉哈塘地区发育流入型、流出型和含水层洞穴型等3种类型的暗河系统,以流入型和流出型暗河河道系统为主,该类暗河系统是大规模缝洞体储层形成的主要方式,也是大规模油气富集区形成的基础,该类成因的储层成为勘探开发的重点目标。该套碳酸盐岩岩溶古河道识别方法对喀斯特地区有利储层预测、油气富集区优选及勘探开发均具有示范意义。The paleo-karst landforms formed in the Ordovician Lianglitage Formation after the deposition of carbonate rocks in the Halahatang area,which is favorable for the formation of high-yielding hydrocarbon reservoirs,but its complexity brings high exploration risk.The seismic,drilling and logging data were applied to optimize the automatic identification of riverbed erosion depth,RGB mixing three primary colors,amplitude attribute extraction and seismic reflection structure analysis,and six groups of river channel and47underground river channels in the Ordovician carbonate rocks were identified.The study shows that the reservoir is closely related to the underground river system,and there are three types of underground river system including inflow,outflow and aquifer cave,and the former two types are predominant.This underground river system is the main mechanism of the formation of large-scale fractured-vuggy reservoirs,and it is also the foundation for the large-scale hydrocarbon enrichment areas.The reservoirs with this genesis become the key targets of exploration and development.This identification method of carbonate karstic paleochannels is significant for favorable reservoir prediction,hydrocarbon enrichment area optimization,exploration and development in paleo-karst area.

关 键 词：碳酸盐岩油气藏 岩溶古河道 奥陶系 哈拉哈塘地区 

分 类 号：TE132.1[石油与天然气工程—油气勘探]