塔里木盆地震旦系石油地质条件分析及有利区优选

Petroleum Geologic Characteristics and Favorable Area Screening of Sinian,Tarim Basin of China

逼近油气源,向深层探索原生油气藏是塔里木盆地近年来勘探的热点.基于钻井、周缘露头及地震资料,利用古地貌、地震相刻画技术,通过综合地质分析,认为塔里木盆地深层南华-震旦系发育湖相烃源岩,上震旦统发育高能滩相白云岩储层,上覆玉尔吐斯组泥页岩,不仅可作为上震旦统白云岩区域盖层,同时可以作为源岩上生下储,纵向上共同构成了一套“双源供烃,源盖一体”的优质、高效的生、储、盖组合.结合构造演化研究,指出塔中西北部、塔北北缘、柯坪、麦盖提斜坡中段为震旦系白云岩四大勘探有利区,勘探潜力大.

Approaching to oil and gas source and exploring deep-buried primary hydrocarbon reservoir has become one of hotspots in oil & gas exploration of Tarim basin. According to the new well drilling data,seismic data and outcrops data,using the paleo-geomorphy and seismic facies depiction techniques,it is thought that Tarim basin Nanhuan-Sinian develops the lacustrine source rocks,the upper Sinian develops high-energy bank-facies domolite reservoir. The overlying Yuertusi formation is characterized by mudstone and shale,which can not only act as source rock,but also serve as cap-rock for the upper Sinian domolite reservoir. They constitute a highly efficient,good-quality source-reservoir-cap assemblages vertically. In combination with regional tectonic zone evaluation,it is supposed the northwest part of Tazhong uplift,the north part of Tabei uplift,Keping uplift,the middle part of Maigaiti slope are favorable areas for upper Sinian dolomite hydrocarbon exploration.