河坝地区嘉二段储层发育控制因素研究

Factors to Influence Reservoir Growth of Jialingjiang 2 Member, Heba Area

根据岩心资料、测井分析进行了河坝地区嘉二段储层特征分析。河坝地区嘉二段储层的岩性主要为砂屑(鲕粒)云岩、粉—细晶云岩。储层的储集空间类型多样,其中粒间溶孔、粒内溶孔为主要储集空间。进一步对储层的发育控制因素进行了研究,认为沉积环境不仅控制储层的发育分布,同时还影响了成岩作用的进程,同生期暴露大气淡水溶蚀作用和渗透回流白云石化作用对储层发育具有建设性作用,构造作用形成的裂缝可以提供部分储集空间,也能沟通其他各类孔隙。

Based on the analysis of core and well-logging data,the reservoir characteristics of Jialingjiang 2 Member in Heba area was studied. Results show that(1)the reservoir is mainly composed of sand- clastic(oolitic)dolomites, and powder- and fine- crystal dolomites; and(2)the reservoir space is various, containing intergranular, intragranular, and intercrystalline dissolution pore, and gypsum solution cavity. After a further study on some factors to influence the reservoir growth, it is considered that sedimentary environment influences not only reservoir growth distribution but also diagenesis process. Both syngenetic exposure meteoric fresh-water dissolution and seepage reflux dolomitilization are constructive to reservoir growth. Formed by tectonism, some fractures may supply much reservoir space and connect with other pores.