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沉积微相研究是认识储层各种物性特征的重要基础。以岩心和测井分析资料为基础,通过对Ⅵ、Ⅶ油组的岩石类型及其组合、沉积构造、生物特征及粒度分布特征等沉积相标志的综合研究,确认目的层为一套扇三角洲沉积体。可进一步分为三角洲前缘及前三角洲两个亚相,其内主要发育水下分流河道、水下分流河道间、河口砂坝、远砂坝、席状砂及前三角洲泥微相。研究表明河口砂坝、水下分流河道沉积储层物性较好,远砂坝、席状砂砂体物性相对较好。反映了沉积微相对研究区储层物性特征起着重要作用。
Sedimentary microfacies research is an important foundation for understanding various physical properties of reservoirs. Based on the core and log analysis data, a comprehensive study of sedimentary facies markers such as rock types and their assemblages, sedimentary structures, biological characteristics and grain size distribution of VI and Ⅶ oil groups is carried out to confirm that the target layer is a set of fan delta sediments body. It can be further divided into two subfacies, the delta front and the former delta, which mainly develop underwater distributary channel, underwater distributary channel, estuarine sand bar, distal sand bar, sand sheet and foreland mud microfacies. The results show that estuary sand bar and submarine distributary channel sedimentary reservoir have good physical properties, and far sand bar and sandy sand body have relatively good physical properties. It reflects that sedimentary microfacies plays an important role in reservoir physical properties in the study area.