龙门山中段前缘鸭子河构造深层须家河组油气勘探

DISCUSSION ON OIL AND GAS EXPLORATION OF XUJIAHE GROUP IN YAZI RIVER STRUCTURE OF THE MIDDLE LONGMENSHAN IN WESTERN SICHUAN

在鸭子河构造深层油气勘探现状分析的基础上 ,提出了川鸭 12 6井须家河组分层以及油气是否能规模成藏等存在的问题。通过鸭子河构造须二段的沉积相带、砂体展布 ,以及鸭子河地区构造演化分析 ,认为不仅鸭子河地区须二段沉积环境向西存在着相变 ,而且该区因不存在印支及燕山期适时古构造 ,也就不存在油气规模聚集成藏的条件 ;同时指出鸭子河地区深层油气的有限规模成藏实为由构造裂缝系统控制的小规模油气藏 ,属于构造裂缝和岩性复合圈闭成藏类型。

Based on the exploration analysis of the Yazi River Structure, the authors put forward the questions how to divide the layers of Well CY 126, and if it can form a large scale reservoir formation in the Xujiahe Group. Through the analysis of sedimentary facies, the distribution of sandstone and the tectonic evolution in the second member of the Xujiahe Group in the Yazi River, the authors think that the sedimentary facies change does not only exist from east to west in the second member of the Xujiahe Group, but also it does not exist a large scale reservoir formation because the palaeouplift did not exist in Indo China and Yanshan structure movememt period. Meanwhile, the authors also point out that the small scale reservoir formation is controlled by tectonic fractures, it belongs to tectonic fracture and lithology complex trap types. So the oil and gas exploration will be carried out cautionsly in the deep layer of the Yazi River area.