【摘要】 酒西盆地青西凹陷下白垩统已钻获多口中、高产工业油井,显示具备优越的油气地质条件。受来自西部、北西部、南部、东部4个物源方向控制,青西凹陷下白垩统主要发育扇三角洲、湖泊和湖底扇沉积体系,自盆缘至凹陷中心形成扇三角洲—湖泊—湖底扇展布的二级扇沉积模式。在沉积体系特征分析基础上,结合测井、岩芯及地震资料,对青西凹陷未投入或投入很少勘探工作量的区域进行了有利区块预测,最终确定最有利勘探区2个、有利勘探区3个,并分别进行了详细的区块评价,为进一步滚动勘探提供借鉴和地质依据。更多还原

【Abstract】 The exploration of several medium-to high-capacity industrial oil wells in the Lower Cretaceous strata indicates the favourable geological conditions for hydrocarbon accumulation in the Qingxi depression,Jiuxi Basin,Gansu.Controlled by the source areas in the western,northwestern,southern and eastern parts,the fan delta,lake and sublacustrine fan depositional systems are developed in the Lower Cretaceous strata in the Qingxi depression.A second-order fan model may be constructed displaying the distribution patterns of fan delta→lake→sublacustrine fan from the margin to the centre of the depression.The prediction and delineation of the favourable areas have been made on the basis of depositional system analysis,well logs,drilling cores and seismic data for further exploration,including four most favourable exploration areas,and one favourable exploration area.更多还原