塔里木盆地英吉苏凹陷侏罗系储层性质控制因素及勘探意义

The Influential Factors on the Quality of Jurassic Reservoir and its Oil Exploratory Significance in Yingjisu Area, Tarim Basin

英吉苏地区侏罗系储层以细粒 -中粒碎屑岩为主 ,岩屑含量 40 .86%～ 5 4.43 % ,石英含量 3 4.79%～ 45 .45 % ,长石含量 10 .68%～ 16.82 % ,碳酸盐和泥质胶结物含量为 8.9% ,属低成熟度岩屑砂岩 ;储层物性孔隙度 7.7%～ 18.6% ,渗透率 9.72× 10 - 3～ 2 7.81× 10 - 3μm2 ,属于中低孔 -中低渗储层 ;储层控制因素主要有以下三个方面 :成岩压实作用是降低孔隙的最主要因素 ,压实作用所损失的孔隙量为 2 2 .85 %～ 3 1.68% ;碳酸盐岩胶结减孔作用是影响储层性质的重要因素 ,胶结减孔量为 8.5 7%～ 14 .48% ;砂岩的孔隙空间被网状分布的伊蒙 -绿蒙混层粘土充填后形成的微细孔喉所产生水锁现象 ,具有很高的毛管压力 ,降低了储层的原始渗透能力。

The reservoir is composed of fine-medium sandstones in Yingjisu area, Tarim basin. The components of sandstone are detritus(40\^86%～54\^43%), quartz(34\^79%～45\^45%) and feldspar (10\^68%～16\^82%). The cement content of of Carbonate and clay is 8\^9%. And it belongs to low degree of sandstone maturity. The reservoir has the properties of low-middle porosity and permeability. The porosity of samples is 7\^7%～18\^6%, and permeability is 9\^72×10^(-3)～27\^81×10^(-3) μm^2. The reservoir quality is controlled by three factors as follows: The compaction is the main factor for reducing the porosity of Yingjisu sandstones and 22.85%～31\^68% porosity loses. The carbonate cementation is the other factor for reducing porosity about 8.57%～14.48%. And the water-locked phenomenon that generated by tiny pore in which filled with I/S clay, and has very high capillary pressure lead to reduce permeability of reservoir due to some tiny pore were.