包界地区上三叠统须家河组储层特征

Reservoir characteristics of Xujiahe Formation of Upper Triassic in Baojie Area

殷孝梅 彭军 何琰 刘建锋 周康

勘探南方分公司勘探研究院，四川 成都 610041 西南石油大学资源与环境学院，四川 成都 610500

以包界地区上三叠统须家河组储层为研究对象，在实测剖面和详细观察岩心的基础上，从沉积岩石学特征、储集空间类型、孔隙结构特征及储集物性特征等方面对储层进行了研究。须家河组储集岩主要为中-细粒长石岩屑砂岩、岩屑长石砂岩，主要形成于河流三角洲－湖泊沉积体系中，储集空间主要为原生粒间孔、次生粒间溶孔、次生粒内孔及填隙物晶间孔，孔隙度主要分布在5%~7%，渗透率主要分布在（0.1~0.5）×10-3 μm2，储层类型为低孔—特低孔，低渗—特低渗裂缝-孔隙型。包界地区须家河组以Ⅲ类、Ⅱ类储层为主。

This paper studies the reservoir of Xujiahe Formation of Upper Triassic in Baojie Area based on the observation of cores and measured profiles and from the reservoir characteristics as petrology,type of reservoir space,pore structure and petrophysical properties. It points out that the reservoir rocks mainly consist of medium to fine feldspathic, lithic arenite and lithic arkose,which deposited in the depositional system of river delta to lake. The reservoir pore space is mainly made up of primary intergranular pore,secondary intergranular pore,secondary intragranular pore and interstitial matter intercrystal pore. The porosity is mainly in the
range of 5 % to 7 % and the permeability is between 0.1×10^-3μm² and 0.5×10^-3μm². .The reservoir is fracture-type and porous-type reservoir with low and extra low porosity and permeability. The reservoir is mainly Ⅲand Ⅱtype in Xujiahe Formation.