鄂尔多斯盆地西南部镇泾地区长8油层组致密储层评价

发布时间：2018-06-27 02:25

  本文选题：鄂尔多斯盆地 + 延长组　； 参考：《地质与勘探》2017年02期

【摘要】：综合鄂尔多斯盆地西南部镇泾地区延长组长8油层组的岩心、薄片、孔渗及压汞测试等资料,在长8储层结构、储层质量发育控制因素研究基础上,对长8低渗致密砂岩储层进行了分类评价。结果表明,长8砂岩储层发育低孔-特低渗储集物性,储层孔隙结构具有细-微孔喉、排驱压力大、分选差的特征,主要可分为3种类型,其中发育Ⅰ型曲线储层孔渗性最好。沉积作用形成的物质基础决定了储层原始孔渗性能,其中分流河道及水下分流河道具最优孔渗性能;成岩作用中,压实作用是储层储集性能破坏的主要因素;溶蚀作用起建设性改善作用。选取孔隙度、渗透率、孔隙排驱压力、中值压力和中值孔喉半径等主要储层参数进行聚类分析,将长8储层划分为3种类型:Ⅰ类为最好储层,Ⅱ类为较好储层,Ⅲ类为相对最差储层。其中,Ⅰ类储层主要分布于分流河道分叉叠置及水下分流河道汇聚叠合部位,储层品质最好,为最有利勘探目标。
[Abstract]:Based on the data of core, thin slice, pore permeability and mercury injection test of Chang 8 formation in Zhenjing area, southwest of Ordos Basin, on the basis of study on reservoir structure and controlling factors of reservoir quality development, The classification and evaluation of Chang 8 low permeability tight sandstone reservoir are carried out. The results show that the reservoir of Chang 8 sandstone has low porosity and very low permeability. The pore structure of Chang 8 sandstone reservoir has the characteristics of fine micropore throat, large displacement pressure and poor sorting. It can be divided into three main types, among which type I curve reservoir has the best porosity and permeability. The material foundation formed by sedimentation determines the original pore and permeability performance of reservoir, in which distributary channel and underwater distributary river props optimize pore and permeability performance, compaction is the main factor of reservoir performance destruction in diagenesis. Dissolution plays a constructive role in improvement. The main reservoir parameters, such as porosity, permeability, pore displacement pressure, median pressure and median pore throat radius, are selected for cluster analysis. Chang8 reservoir is divided into three types: type 鈪，

本文编号：2072313