川东北PG构造三叠系飞仙关组台缘鲕滩储层特征  

PLATFORM EDGE OOLITIC BEACH RESERVOIR CHARACTERISTICS OF FEIXIANGUAN FORMA- TION OF TRIASSIC IN PG STRUCTURE IN NORTHEAST SICHUAN

作　　者：刘成川[1] 向丹[1] 黄大志[1] 

机构地区：[1]"油气藏地质及开发工程"国家重点实验室.成都理工大学

出　　处：《天然气工业》2005年第7期17-19,14,共3页Natural Gas Industry

摘　　要：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。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)×103 μm3 with an average of 25. 2×103 μm3, 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.

关 键 词：飞仙关组 三叠系 储层特征 台缘 构造 PG 川东北 四川盆地东北部 毛细管压力曲线 含水饱和度 300m 鲕滩储层 溶蚀作用 白云石化 保存条件 地质分析 岩心分析 统计分析 排驱压力 碳酸盐岩 孔隙结构 油气勘探 白云岩 孔隙度 

分 类 号：P618.13[天文地球—矿床学] P618.130.2[天文地球—地质学]