川西坳陷邛西须二气藏储层特征及控制因素

川西坳陷邛西地区须家河组二段是研究区天然气的主要产层，通过对该区研究层段岩石学特征、储集空间类型、物性特征、孔喉结构特征、储层类型和控制因素等进行系统研究，其结果表明：须二段储集岩类型主要以砂岩为主，储集空间类型以孔隙为主，裂缝次之，其平均基质孔隙度为3．44％，平均渗透率为0．036×10-3μm-3，为典型的低孔隙度一低渗透率储层．本次研究还指出了该区研究层段有效储层厚度平面分布有利区，即邛西4井至邛西10井井区和邛西6井至邛西16井井区．储层发育的控制因素是沉积相、成岩作用和裂缝，其中沉积相控制着储层砂岩体的形态、规模、粒度、矿物成分等方面，成岩作用则通过压实作用、胶结作用、溶蚀作用等方面控制着储层的发育，而构造裂缝主要起渗流通道的作用．

Reservoir characteristics and controlling factors of Qiongxi Xu -jiahe formation second member gas reservoirs in West Sichuan depression

The Xujiahe formation second member is the principal reservoir of Qiongxi tectonic in West Sichuan depression. Through the system research of petrologic characteristics, reservoir space types, physical property characteristics, pore throat structure characteristics, reservoir types and controlling factors on this research area. The result shows that research area is the typical low porosity and permeability reservoir. Reservoir type is mainly sandstones. Reservoir space type is mainly porosity and the next is crack. The average matrix porosity is 3. 44% and the average permeability is 0. 036 × 10-3μm2. This paper also points out the favorable areas of this study formation, one is from the well of Qiongxi 4 to Qiongxi 10, the other is from the well of Qiongxi 6 to Qiongxi 16. Sedimentation, diagenesis and crack control the reservoir development, sedimentation control the sand body of this research area, such as morphology, scale, particle size, mineral composition and so on. The reservoir developments are controlled by diagenesis, such as compaction, cementation, dissolution, etc. while structural fracture reacts the seepage channel.