哈拉哈塘地区奥陶系岩溶古河道识别及其成藏意义

发布时间：2018-04-12 23:27

本文选题：碳酸盐岩油气藏 + 岩溶古河道　；参考：《岩性油气藏》2017年05期

【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。
[Abstract]:The carbonate rocks of the Lianglitag formation of Ordovician in the Hala Hattang area were exposed briefly and the paleo karst landforms were formed. The karst paleochannel was favorable to the formation of high yield oil and gas reservoirs, but its complexity brought about high exploration risk.By synthetically using seismic, drilling and logging data, the techniques of automatic identification of erosion depth of ancient river bed and RGB mixed frequency trichrome, amplitude attribute extraction and seismic reflection structure analysis are optimized.In the Ordovician carbonate rocks, 6 groups of Minghe river and 47 dark river channels have been identified.It is considered that the reservoir development is closely related to the type of the dark river system, and the inflow type, outflow type and aquifer cave type are three types of the dark river system, mainly the inflow type and the outflow type.This kind of dark river system is the main way of formation of large scale fractured and cavernous reservoirs and the basis of forming large scale oil and gas accumulation areas. The reservoir of this kind of origin has become the key target of exploration and development.The method of identifying karst paleochannel in carbonate rock is of great significance to the prediction of favorable reservoir in karst area, the optimal selection of oil-gas accumulation area and the exploration and development.
【作者单位】：中国石油勘探开发研究院西北分院;中国石油塔里木油田分公司勘探开发研究院;
【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
【分类号】：P618.13

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