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通过对4条野外剖面、40口并岩心样品及84张薄片的观察和测井等资料的分析,对川南观音场-瓦市地区须六段的岩石学特征、孔隙类型、孔隙结构及孔渗特征等进行了深入研究。结果表明:川南地区须六段岩性主要为中-细粒长石岩屑砂岩和岩屑石英砂岩,孔隙度在6%～10%之间,平均孔隙度为7.3%。渗透率为0.03×10-3μm2～0.9×10-3μm2,平均渗透率为0.177×10-3μm2。储层属于典型的低孔低渗储层,储集空间主要为粒间孔和粒内溶孔。在平面上,储层物性受沉积相带的控制;在垂向上,随深度的增加,压实作用和胶结作用使物性急剧变差。绿泥石的环边胶结作用、长石的溶蚀作用对储层物性起建设性作用,构造作用极大地改善了储层的物性。
Based on the analysis of observation data and logging data of 4 field sections, 40 core samples and 84 thin slices, the petrological characteristics, pore types, pore structure and pore permeability Features such as in-depth study. The results show that the lithology of Xu 6 member in the southern Sichuan area is mainly medium-fine feldspar lithic sandstone and lithic quartz sandstone with a porosity of 6% -10% and an average porosity of 7.3%. The permeability is 0.03 × 10 -3 μm 2 to 0.9 × 10 -3 μm 2, and the average permeability is 0.177 × 10 -3 μm 2. The reservoir belongs to typical low-porosity and low-permeability reservoirs, and the reservoir space mainly consists of intergranular pores and intragranular dissolved pores. On the plane, reservoir properties are controlled by sedimentary facies; in the vertical direction, with the increase of depth, the compaction and cementation make the property sharply worse. Chlorite ring edge binding, feldspar dissolution of the reservoir physical properties play a constructive role in the formation of the reservoir has greatly improved physical properties.