龙门山中段前缘鸭子河构造深层须家河组油气勘探

摘要

Based on the exploration analysis of the Yazi Rive r Structure, the authors put forward the questions how to divide the layers of Well CY-126, and if it can for m a large scale reservoir formation in the Xujiahe Group. Through the analysis of se dimentary facies, the distribution of sandstone and the tectonic evolution in th e second m ember of the Xujiahe Group in the Yazi River, the authors think that the sedimen tary facies change does not only exist from east to west in the second member of the Xujiahe Group, but als o it does not exist a large scale reservoir formation because the palaeouplift did not exi st in Indo-China and Yanshan structure movememt period. Meanwhile, the a uthors 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.%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126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。因此认为对鸭子河地区深层的油气勘探应持谨慎态度。