川东北飞仙关组鲕滩储层发育的主控因素和成因模式

四川盆地东北地区飞仙关组的鲕滩气藏是该盆地最近的勘探重点。指出该类气藏储集岩主要有残余鲕粒白云岩、鲕粒灰岩和泥-粉晶白云岩，其中残余鲕粒白云岩是最好的储层；主要的孔隙空间为粒间孔、粒间溶孔、粒内溶孔、晶间孔、铸模孔和裂缝;储层为低孔低渗性裂缝-孔隙型，发育程度主要受沉积相、白云石化作用、溶蚀作用和裂缝控制；优质储层主要由台缘鲕滩发生混合水白云石化作用和埋藏溶蚀作用所形成—台缘鲕滩沉积初期发育大量的原生粒间孔，后经过压实和胶结作用，孔隙几乎全部被破坏，再经过混合水白云石化作用和埋藏溶蚀作用的改造，形成了大量的次生孔隙。

MASTER CONTROLLING FACTORS AND GENETIC MODE OF OOLITIC SHOAL RESERVOIR DEVELOPMENT IN FEIXIANGUAN FORMATION NORTHEASTERN SICHUAN BASIN

In recent years,the oolitic shoal gas reservoir in the Feixianguan Formation in northeastern Sichuan basin is an important exploration target.The reservoir rocks include contain oolitic limestone,micritic dolomite and residual oolitic dolomite,of them the residual oolitic dolomite is the best reservoir.The pore space consists of intergranular pore,intergranular dissolved pore,intragranular dissolved pore,intercrystalline pore,moldic pore and fracture.The gas reservoir is a fractured and porous reservoir with low porosity and low permeability.The development of the reservoir is controlled by sedimentary facies,dolomitization,corrosion and fractures.High-grade reservoir is the fringing oolitic beach undergone mixed water dolomitization and burial corrosion(Primary pores produced in the early period of fringing oolitic beach sediment were completely destroyed by compaction and cementation,and lots of secondary pores were produced by the mixed water dolomitization and burial corrosion).