塔里木盆地奥陶系台缘类型及其储层发育程度的差异性  

Relationship between Ordovician platform margin types and reef-shoal reservoirs in Tarim Basin

作　　者：郑兴平[1,2] 潘文庆[2,3] 常少英[1,2] 沈安江[1,2] 

机构地区：[1]中国石油勘探开发研究院杭州地质研究院 [2]中国石油天然气集团公司碳酸盐岩储层重点实验室 [3]中国石油塔里木油田分公司

出　　处：《岩性油气藏》2011年第5期1-4,共4页Lithologic Reservoirs

基　　金：国家科技重大专项“四川、塔里木、鄂尔多斯盆地海相碳酸盐岩储层形成机理与有利储层分布预测”(编号:2008ZX05004-002)项目资助

摘　　要：塔里木盆地奥陶系多个层段发育碳酸盐岩台地边缘高能沉积相带,但其台缘礁滩体储层性能差异显著。统计表明,进积-加积型镶边台缘在薄片面孔率、岩样孔隙度及录井异常方面总体超过退积-缓坡型台缘带。前缘斜坡角度与台缘带储地比之间存在良好的正相关性。斜坡角度大、建隆高的进积-加积型台缘带礁滩体在准同生期遭受较强的暴露和大气淡水淋滤,且早期存在的孔隙也有利于后期叠加埋藏溶蚀作用,因而储层厚度较大,储集条件较好;而斜坡角度小的缓坡台缘带需要裂缝、热液和白云石化作用等额外因素才能形成有效储集体。Multiple platform margins developed in Ordovician in Tarim Basin, but their reservoirs have significant diffe-rences. Statistics data show that reservoir performance of high-angle platform margin is much better than lower-angle platform margin in the aspects of thin section, porosity and logging scales. The angle of foreslope has a positive correlation with the reservoir-layer thickness ratio in platform margin reservoir. High-angle platform margin reef-shoal suffered intense exposure and meteoric water leaching and early pores is favorable for later burial dissolution. So the reservoirs in high-angle platform margin reef-shoal have the characteristics of larger thickness and good quality. Low-angle platform margin reef-shoal needs additional conditions to develop good reservoirs, such as fracture, hydrothermal fluid and dolomitization.

关 键 词：台缘 储层 礁滩 斜坡 角度 储地比 塔里木盆地 

分 类 号：TE122.2[石油与天然气工程—油气勘探]