四川某气田蓬莱镇组储层特征及影响因素

Penglaizhen Formation Reservoir Characteristics and Influence in a Gas Pool,Sichuan Province

该气田处于四川盆地川西坳陷上,储层岩性主要为褐灰色、灰色、灰绿色细粒岩屑砂岩和岩屑石英砂岩;粘土矿物主要为绿泥石/蒙脱石混层和伊利石;储层具中-低孔隙度、渗透率的特点,属常规—近致密储层;气藏储层岩石的孔隙类型主要有粒间孔、粒间(内)溶孔及少量晶间微孔,其中对储层储集性贡献最大的为粒间溶孔与粒间孔.影响蓬莱镇组气藏储层孔隙结构及储集性的因素有岩相、岩性条件及成岩作用.

This gas field locates in Chuanxi sag, Sichan basin. Reservoir lithology is mainly brown-gray, gray and gray-green with granule lithic sandstone and lithic quartz sandstone.Clay minerals are the mixture of chlorite and smectite and illite.The reservoir's porosity and permeability range from middle to low position and belong to traditional compact reservoir.The type of interstice of the reservoir rock is mainly intergranular pore, intergranular (innergranular) dissolved pore, and a little intercrystalline micropore, of which intergranular pore and intergranular dissolved pore do the most contribution to the reservoir's capability. The factors which affect the pore structure and reservoir's capability of this gas pool are lithic facies, lithology conditions, and deagenesis.