摘要
塔中奥陶系鹰山组为近年来塔里木盆地重要勘探区块之一,为落实鹰山组油气富集有利区,通过大型溶洞与裂缝和小溶孔发育的相互关系,分析了大型溶洞的分布和成因,可以看出裂缝和小型溶孔主要发育在大型溶洞地层的周围,最远不超过200 m,而这些小的裂缝溶孔组成的缝洞体系是良好的储层,塔中鹰山组绝大部分的油气显示都位于大型溶洞下部的风洞体系发育区,因此在进行水平井钻井钻探时,高一伽马和高二伽马可以作为良好的标志层,如何准确地定位这两个高伽马地层,对提高鹰山组水平井储层钻遇率与成功率具有重要的意义。
Yingshan formation of Ordovician in Tazhong area is one of the important exploration blocks in Tarim basin in recent years.In order to implement the favorable area for oil and gas enrichment of Yingshan formation,the distribution and genesis of large-scale karst caves were analyzed based on the relationship between large-scale karst caves and the development of fractures and small-scale karst pores.The results showed that the fractures and small-scale karst pores are mainly developed around the large-scale karst cave strata,and the farthest distance is not more than 200 m.The fracture cavity system composed of these small-scale fractures and dissolved holes is a good reservoir.Most of the oil and gas of Yingshan formation in Tazhong area are located in the wind tunnel system development area under the large-scale karst cave.Therefore,in horizontal well drilling,high gamma can be used as good marker layer.How to accurately locate these high gamma layers is of great significance to improve the drilling rate and success rate of horizontal well reservoir in Yingshan formation.
作者
李笑冉
LI Xiao-ran(College of Geophysics and Petroleum Resources,Yangtze University,Hubei Wuhan 430100,China)
出处
《当代化工》
CAS
2020年第4期641-644,共4页
Contemporary Chemical Industry
基金
国家科技重大专项“大型地层油气藏形成主控因素与有利区带评价”基金项目,项目号:2017ZX05001-001
关键词
奥陶系碳酸盐岩
鹰山组
高伽马
油气钻探
Ordovician carbonate rock
Yingshan formation
high gamma
oil and gas drilling
