摘要
在详尽的岩石学研究的基础上,对塔里木盆地塔中地区志留系柯坪塔格组上3亚段储层物性特征进行了详细的描述。上3亚段储层孔隙类型以残余原生粒间孔为主,岩性主要为粉砂、细粒岩屑砂岩。上3亚段储层物性受碳酸盐的胶结作用影响较大,储层碳酸盐含量与孔、渗之间亦呈明显的负相关性。上3亚段储层孔隙度大于9%,渗透率大于2×10-3~3×10-3μm2(一般认为孔隙度≥9%,渗透率≥2×10-3~3×10-3μm2可作为储层),并且孔隙度和渗透率具有很好的线性相关性,随着孔隙度的增加,渗透率也明显增加。进而根据储层物性的平面展布情况,总结出塔中地区志留系柯坪塔格组上3亚段碎屑岩储层的高值区位于塔中的东南部,并且该层段碎屑岩储层的油气分布与储层物性关系密切,上3亚段可流动油气藏的分布范围与储层的孔、渗高值区的范围相一致。最后,根据储层特征与油气分布的关系,预测了该区志留系上3亚段有利区域分布在塔中54井区附近、塔中30井区附近以及塔中17和塔中37井区附近。此预测为研究区下一步油气勘探工作提供了新思路。
The poroperm characteristics of reservoirs in the 3rd upper sub-member of the Silurian Kepingtage Formation in Tazhong. Tarim Basin are described in detail in this paper based on petrology study. The results show that the pores of the reservoirs are mainly of primary residual intergranular pores and the lithologies are dominated by siltstone and fine lithic sandstone. The reservoir poroperm characteristics are affected by carbonate cementation, and the carbonate content presents an evident negative correlation with porosity and permeability. The porosity is more than 9% and permeability is over 2×10^-3-3×10^-3μm^2（ it is generally accepted that strata with porosity≥9% and permeability≥2×10^-3-3×10^-3μm^2 are reservoirs）and the permeability is in positive linear correlation with the porosity. The horizontal distribution of poroperm characteristic indicates that this reservoirs interval has high porosity and permeability in the southeastern Tazhong areas and its oil/gas distri- butions are closely related to the poroperm characteristics. Furthermore, favorable plays for petroleum exploration in this reservoir interval are predicted on the basis of relationship between oil/gas distribution and reservoir cha- racteristics. These prediction results point out the directions for further exploration in the area.
出处
《石油与天然气地质》
EI
CAS
CSCD
北大核心
2008年第2期174-180,共7页
Oil & Gas Geology
基金
国家重点基础研究发展规划(973)项目(2006CB202308)
关键词
储层特征
油气藏
油气分布
志留系
塔中地区
塔里木盆地
reservoir characteristic
hydrocarbon reservoir
oil and gas distribution
Silurian
Tazhong area
Tarim Basin
