长岭气田登娄库组储层物性研究

Reservoir property of Denglouku Formation in Changling Gasfield

岩心和铸体薄片分析表明,长岭气田登娄库组为低孔、低渗储层,岩石类型主要为细粒长石岩屑砂岩,砂岩孔隙度在2.7%～6.6%,储集空间以次生孔隙为主,孔隙类型主要为粒间溶孔。影响储层物性的因素主要有岩石结构、沉积环境、成岩作用。沉积环境中分流河道的储层物性相对较好,天然堤和决口扇次之,河道间的储层物性最差。成岩作用中的压实作用、压溶作用和胶结作用对储集层原生孔隙破坏性较大,使储层物性变差;而溶蚀作用可以形成次生孔隙,从而改善储层物性。该区以破坏储层物性的成岩作用为主。

Based on core and cast section analysis, it is believed that Denglouku Formation in Changling Gasfield is low porosity and low permeability reservoir. The rock type is mainly fine-grained feldspathic lithic sandstone, and the rock porosity ranges from 2.7% to 6.6%. The reservoir space is mainly secondary pore, and the pore type is mainly intergranular dissolved pore. Rock texture, sedimentary environment and diagenesis are the main factors influencing the reservoir properties. The reservoir property of branch channel is relatively good, followed by the natural levee and crevasse splay, and it is the worst in the interchannel. The compaction, pressolution and cementation do great damage to the primary porosity of reservoir, while the dissolution is favorable for the forming of secondary pore and improve the reservoir property. The diagenesis in this area is mainly destructive to the reservoir property.