低水位斜坡扇的特征及在油气勘探中的意义

Sedimentary feature and significance of oil gas exploration of the slope fan system of the low system tract

应用层序地层学理论 ,在对北部湾等含油气盆地层序地层、沉积体系进行系统研究的基础上 ,论述了低水位斜坡扇体的沉积特征、测井与地震反射特征及在油气勘探中的意义。认为斜坡扇中的砂体往往处于非常有利的生、储、盖组合之中 ,物性一般较好 ,有利于油气的聚集 ,通常可形成地层圈闭或构造 -地层复合圈闭油气藏。

Based on the theory of sequence stratigraphy, the framework of the high-resolution sequence stratigraphy and the sedimentary systems are studied in Beibuwan basin etc. It is discussed that the features of the deposition and drilling core, well logging and seismic correspond as well as the significances in prospecting of oil and gas. The results indicate that the slope fans are very suitable for source-reservoir-caprock association of gas and petroleum. It generally can form stratigraphic trap or structural- stratigraphic combination traps reservoir.