庙西南凸起勘探发现与油气成藏条件分析

Exploration discoveries and hydrocarbon accumulation conditions in the Miaoxinan uplift

庙西北凸起、渤南低凸起均已经取得了较好的油气发现,庙西南凸起是目前渤海海域唯一没有实施钻探的二级构造单元,油气成藏要素和勘探潜力均不清晰。通过对庙西南地区圈闭和油气成藏条件的系统评价,在庙西南凸起上发现和落实了一批有利目标,并进一步深入研究了该区不同构造单元油气成藏的差异性。优先钻探的203构造在馆陶油气层测试获得商业油流,展现了庙西南凸起良好的勘探潜力。明确了该凸起区地层组合特征、馆陶组沉积特点和油气成藏的模式,找到了油气富集的控制因素,同时对该区其他几个构造圈闭勘探潜力的进一步挖掘也有较好的指导意义。

Favorable exploration discoveries have been obtained in the Miaoxibei uplift and Bonan lower uplift,and the Miaoxinan uplift is the only secondary tectonic unit undrilled in the Bohai Bay basin where hydrocarbon accumulation elements and exploration potential are still unclear.Based on integrated evaluation of the trap and hydrocarbon accumulation conditions in Miaoxinan area,a number of favorable targets are defined,and the diversification of hydrocarbon accumulations in different tectonic units is studied in depth.The 203 structure unit was drilled first and commercial oil flow was obtained from Guantao formation test,showing promising exploration potential in the Miaoxinan uplift.This research has defined stratigraphic assemblages,sedimentary feature and hydrocarbon accumulation pattern in Guantao formation,found out the control factors on hydrocarbon accumulation,and is instructive to exploration in other structural traps in this area.