南阳凹陷魏岗地区井震一体化构造重构与滚动勘探实践

Well-seismic integrated structure reconstruction and rolling exploration practice in Weigang area,Nanyang Sag

南阳凹陷中部魏岗地区油气富集,具有断-储联合控藏、构造高点控富、多层系含油、多油藏类型叠合的特征。经过40余年的勘探开发,滚动勘探目标日益零散、碎小、隐蔽,构造识别难度较大。通过井震数据互补的研究落实了构造,取得不同于过去单一钻井对比恢复主力油层断缺形成的宽断面构造认识,重构后主力油层构造认识变化较大;同时利用已钻井及沿层地震属性精细描述魏岗东翼有效厚度小于5 m的储层岩性变化边界与主控断层配置,明确了断层-岩性目标潜力区。

The Weigang area in the central part of the Nanyang Sag is rich in oil and gas,which has the characteristics of combined fault-reservoir control,structural high point control enrichment,multi-layered oil-bearing,and multi-reservoir type superimposition.After more than 40 years of exploration and development,the rolling exploration targets have become increasingly scattered,fragmented,and concealed,making it difficult to identify structures.Through complementary seismic data,it is reunderstood to obtain a wide-section structural understanding and reconstruction that is different from the main oil layer faults recovered from the previous single drilling comparison results,with a lot of change.At the same time,the drilled well and seismic properties along the stratum are used to describe the reservoir lithology change boundary with an effective thickness of less than 5 m in the east flank of Weigang,and the fault potential-lithology target potential area is clarified with the configuration of the main control fault.