塔中下奥陶统鹰山组不整合面的确定及其地质意义

塔中地区下奥陶统鹰山组发育一期重要的不整合面,已在该不整合面中获得重要的油气勘探成果。采用不整合面法、地球物理方法、测井响应特征、洞穴砂泥质充填物的岩性和颜色特征以及微体古生物等资料的综合分析,并结合高精度地震储集体预测和评价成果,确认鹰山组大型岩溶不整合面在塔中斜坡区广泛分布,具有较好的成层性,且连通性较好,是有利的储集体。明确了塔中奥陶系碳酸盐岩油气成藏关键事件以及下奥陶统油气资源规模,重新认识了不整合面油气藏,进而形成了不整合面碳酸盐岩油气勘探的新思路,拓展了油气勘探新领域。

Determination and Geologic Significance of Yingshan Unconformity of Lower Ordovician in Tazhong Area,Tarim Basin

An unconformity exists in Yingshan formation of the Lower Ordovician in Tazhong area,in which significant breakthrough for petroleum exploration has been made.This paper restudies the unconformity by means of unconformity method,geophysics,logging response feature,lithology and colour of cavern sand and shale as well as microfossil information,combining with the results of high-accuracy seismic reservoir prediction and evaluation.It suggests that this large karst unconformity is widely distributed in Tazhon...