潜江凹陷代河地区地层划分对比技术

Technologies of Stratigraphic Division and Correlation in Daihe Area of Qianjiang Sag

代河地区地层层序不完整,没有古近系潜江组(E2q)特有的盐韵律标志层,地层划分对比难度大。应用震井联合分级控制技术,确定了3个对比标志层和2个辅助层,解决了代河地区地质层位认识不清的难题,并将代河地区E2q精确划分为6个油组16个砂层。通过绘制单砂层平面展布图,发现岩性圈闭10个,预测石油地质储量614×104t,其中2个圈闭经过评价,落实储量石油地质157×104t。

In Daihe Area,sequence stratigraphy was incomplete,there was no specific salt rhythmic marker in Qianjiang Formation(E2q),it was difficult for stratigraphic division and correlation,by using seismic-well combined hierarchical control technology,3contrast marking layers and 2auxiliary layers were identified to solve the problem of unclear understanding of geological strata in Daihe Area,the geological strata in Daihe Area were divided into 6oil formations and 16 sand layers.It is found out by drawing the planar distribution of single sand layer that there are 10 lithological traps,forecasted geological reserves are 614×104t,after 2traps are evaluated,geological reserves of 157×104t are determined.