塔里木盆地震旦系勘探领域分析及区带优选

Exploration field analysis and zone optimization of Sinian,Tarim Basin

晚元古代-早古生代碳酸盐岩是油气勘探的重要领域,塔里木盆地震旦系碳酸盐岩层系古老、埋藏深,钻井少,许多地质问题尚不清楚,制约了深层碳酸盐岩层系的勘探。基于塔里木盆地震旦系地质结构分析,通过地层对比及地震预测等手段,对震旦系有利烃源岩的分布、深层高能储集相带及成藏组合进行研究,梳理了盆地震旦系的勘探领域及有利区带。研究认为:塔里木盆地震旦系发育斜坡-盆地相烃源岩,齐格布拉克组上部发育优质白云岩储层,与寒武系底部玉尔吐斯组泥岩可形成有利成藏组合;塔北隆起南斜坡及塔中隆起北斜坡,是塔里木盆地震旦系白云岩最有利的勘探区带,万米埋深内有利勘探面积约为3.1×10^(4)km^(2)。研究成果对塔里木盆地震旦系碳酸盐岩油气勘探具有借鉴意义。

Carbonate rock of Late Proterozoic-Early Paleozoic is an important field of oil and gas exploration.The Sinian carbonate rock series in Tarim Basin are old,deep buried,few drilling wells,and many geological problems are unclear,which restrict the exploration of deep carbonate rock.Based on the analysis of Sinian geological structure,by means of stratigraphic correlation and seismic prediction,the distribution of Sinian favorable source rocks,deep reservoir facies belts and reservoir forming assemblages are studied to comb the exploration fields and favorable zones of Sinian in Tarim Basin.The results show that:slope-basin facies source rocks developed in Sinian.High-quality dolomite reservoirs developed in the upper part of Qigebulake Formation,and mudstone of Yuertus Formation at the bottom of Cambrian can form favorable reservoir cap assemblage.The south slope of Tabei Uplift and the north slope of Tazhong Uplift are the most favorable exploration zones for Sinian dolomite,with favorable exploration area of approximately 31000 km^(2).The research results provide a certain reference for the Sinian carbonate oil and gas exploration in the Tarim Basin.