渤海湾盆地武清凹陷含油气系统的复合性特征与有利勘探区带

Compound characteristics of oil and gas systems and favorable plays in the Wuqing Depression,Bohai Bay Basin

为进一步明确渤海湾盆地武清凹陷的油气勘探潜力,开展了该区重点生烃层系(古近系沙三—沙四段、石炭—二叠系)的含油气系统研究。结果发现:生烃灶不完全吻合,呈现平面部分交叉,由于断层或不整合面等贯通,局部存在油气混源的复合性特征。结合区域构造背景和二维盆地模拟研究成果,分层系划分出了6个有利的油气运聚区带,指出武清凹陷含油气系统运聚叠合区带(即黄花店—泗村店古潜山一带)是中浅层勘探最有利的区带;其次,凹陷深部洼槽区也是有利的深层勘探区带。

In order to further reveal the exploration potential of the Wuqing Depression in the Bohai Bay Basin,we studied the petroleum systems of major source rocks including the Permo-Carboniferous and the third and fourth members of the Paleogene Shahejie Fm,and found that the hydrocarbon kitchens there are so complicated with partial overlapping on the planar map that mixed-source hydrocarbons occur locally due to the existence of faults and/or unconformities.In combination with regional structural settings and 2Dbasin modeling results,we identified 6favorable plays,of which the overlapping area of hydrocarbon migration and accumulation,i.e.the Huanghuadian-Sicundian buried hill,is the most favorable for exploration in medium and shallow layers,while the deep troughs are favorable for exploration in deep layers.