塔里木盆地东南坳陷侏罗系展布特征研究

Distribution of Jurassic strata in Southeastern Depression of Tarim Basin

塔东南坳陷位于塔里木盆地的东南部,勘探程度较低。侏罗系为该区主要油气勘探目的层,明确塔东南坳陷侏罗系展布特征是实现该区油气突破的关键问题。通过分析2015年后实施的最新钻探工程以及最新采集处理的地震、电法剖面,结合钻测井、露头资料,研究塔东南侏罗系分布范围及厚度,结果表明侏罗系在塔东南坳陷广泛发育,仅在且末凸起西部局部地区缺失;瓦石峡凹陷侏罗系十分发育,沉积厚度大,分布范围广,并向阿尔金山前有明显加厚趋势,可作为塔东南坳陷油气勘探目标区。

Southeastern Depression is the southeastern part of Tarim Basin with low exploration degree.Jurassic strata are the main targets for exploration,and it is a key issue to make clear the distribution characteristics of Jurassic in Southeastern Depression for realizing oil and gas discovery.The authors analyzed the latest drilling data combined with the re-acquired and processed seismic,electrical profiles,drilling,well logs and outcrop information after 2015 to study the distribution range and thickness of Jurassic in southeastern Tarim Basin.The results showed that Jurassic strata were widespread in Southeastern Depression of Tarim Basin,while they were absent in the western part of Qiemo bulge locally.Jurassic strata were widely developed in Washixia sag,with huge thickness and broad distribution,and it was obviously thickened toward the piedmont of Altun Mountains.Therefore these strata could be regarded as the targets for oil and gas exploration in Southeastern Depression.