知识与财富的链接
四川东北部罗家寨气田的储层为下三叠统飞仙关组孔隙性鲕粒白云岩。其沉积相属碳酸盐台地的鲕粒滩微相,为台地潮下较高能环境沉积,主要受潮汐作用的控制。原生岩石为亮晶鲕粒石灰岩和泥晶鲕粒石灰岩,白云石化作用使其岩石结构大多遭受破坏。对储层起建设性作用的成岩作用主要有白云石化作用、埋藏溶解作用。白云石化作用是形成优质储层的基础。埋藏溶解作用主要在粒间半充填剩余缝隙、交代白云石的晶间孔内进行,这进一步溶蚀造就了大量超大孔隙、粒间溶孔、粒内孔、铸模孔等。对储层起到破坏作用的主要是充填作用,表现为次生溶蚀孔隙、裂缝、溶洞中充填自生矿物,它们的包裹体测温数据证明充填作用发生在埋藏时期。各种自生矿物充填的不均匀性揭示了岩石与孔隙水之间相互作用的复杂性,以及岩溶水在不同时期是变化的。
The Feixianguan gas reservoirs in the Luojiazhai Gas Field, northeastern Sichuan Province, are composed of the porous oolitic dolomites The reservoirs mainly exist in the oolitic bank facies in the carbonate platforms, which were deposited in high energy environment and mainly controlled by tidal action The primary rocks were sparry oolitic limestone and micrite oolitic limestone, but dolomitization destroyed the original sedimentary textures The diageneses which are constructive to the reservoirs are mainly dolomitization and burial dissolution The dolomitization is the base of forming high quality reservoirs Burial dissolution mainly developed inside the primary micropores, the partly filled intergranular porosities and the intercrystal porosities,which furthermore formed lots of enlarged pores,intergranular pores,oolimolds The diageneses which are destructive to the reservoirs are mainly the filling of minerals in secondary pores,the fissures and the dissolved caverns The data of fluid inclusion analysis showed that the filling of minerals mainly happened during the burial period
