松辽盆地南部双辽断陷生储盖特征与成藏主控因素分析

Analysis of source-reservoir-cap association and major factors controlling hydrocarbon accumulation in Shuangliao Fault Depression,southern Songliao Basin

根据钻井、测井、地震及测试数据综合分析,确立双辽断陷沉积体系展布,明确断陷的生储盖特征,剖析油气成藏主控因素,开展有利勘探区带预测。结果表明:双辽断陷沙河子组发育半深湖-扇三角洲-近岸水下扇沉积体系,与火石岭组火山岩构成上生下储式有利生储盖组合;其成藏主控因素有火山穹窿构造、有利油气源供给、火山穹隆内幕储集层发育、有利生储盖组合及成藏因素有利时空配置5方面;桑树台凸起火山穹窿构造,是今后油气勘探的有利目标区。

Based on the comprehensive analysis of drilling,well logging,seismic and testing data,the distribution of depositional systems were established to pinpoint the characteristics of source-reservoir-cap and analyze the primary factors controlling hydrocarbon accumulation in Shuangliao Fault Depression,and then the favorable exploration play was predicted. The results indicate that semi-deep lacustrine-fan delta-neritic subaqueous fan sedimentary system was developed in the Shahezi Formation,forming upper source-lower reservoir type of source-reservoir-cap assemblage combined with the volcanic rocks of Huoshiling Formation. The primary factors controlling hydrocarbon accumulation of Shuangliao Fault Depression include volcanic doom structure,favorable supply of oil and gas,welldeveloped reservoirs in the volcanic doom structures,favorable assemblage of source-reservoir-cap and space-time configuration of accumulation factors. The volcanic doom structures of Sangshutai Bulge are the favorable target areas of oil and gas exploration in the future.