川东北PG构造三叠系飞仙关组台缘鲕滩储层特征

四川盆地东北部PG构造三叠系飞仙关组台缘鲕滩储层为一套残余砂屑、藻屑鲕粒白云岩和残余鲕粒白云岩。经白云石化和溶蚀作用，溶蚀孔、洞和裂缝十分发育。储层厚逾300 m，离油源近，具有良好的运移和保存条件。通过野外地质分析、镜下鉴定、岩心分析、水饱和度测定及压汞资料统计分析得知，储层孔隙度为0.5%~25.7%，平均为7.55%；渗透率为（0.011~3355.1）×10^-3μm²，平均为25.2×10^-3μm²，含水饱和度在1.4%~52.13%，平均为14%；毛细管压力曲线的排驱压力为0.08~25 MPa，饱和度中值压力为0.2~70 MPa，与同类碳酸盐岩相比，该段储层储渗性、孔隙结构好、含水饱和度低，该套台缘鲕滩厚度为300 m，是本区油气勘探的最有利目标。

PLATFORM EDGE OOLITIC BEACH RESERVOIR CHARACTERISTICS OF FEIXIANGUAN FORMATION OF TRIASSIC IN PG STRUCTURE IN NORTHEAST SICHUAN

Through analyzing statistically the data on field geology， thin section identification， core analysis， water saturation measurement and mercury injection test， the most favourable exploration target of the platform edge oolitic beach reservoir of Feixianguan Formation of Triassic has been found out in PG structure in Northeast Sichuan. This reservoir has porosities of 0.5%—25.7% with an average of 7.55%， permeabilities of (0.011—3355.1)×10-3μm3 with an average of 25.2×10-3μm3， water saturations of 1.4%—52.13% with an average of 14%， displacement pressures of 0.08—25 MPa and saturation median pressures of 0.2—70 MPa. As compared with the same kind of carbonate rocks， this reservoir with a thickness of 300 m is the most beneficial oil and gas exploration target in the region， being fair storage permeability， good pore structure and low water saturation.