延安气田靖边地区马家沟组风化壳储层特征

Characteristics of weathering crust reservoir of Majiagou Formation in Jingbian area of Yan’an gas field

鄂尔多斯盆地靖边地区马家沟组受加里东运动影响,马家沟组发育碳酸盐岩风化壳地貌。本文通过岩心和测井资料,对研究区风化壳及其垂向结构进行识别。利用分析化验资料,对马五段储层的岩石类型、物性及非均质性进行了分析,根据研究结果将储层划分为三类,其中Ⅱ类储层是区内主力含气层段。

Affected by Caledonian movement,Majiagou Formation in Jingbian area of Ordos basin develops carbonate weathering crust landform. In this paper,the weathering crust and its vertical structure in the study area are identified by core and logging data. Based on the analysis and test data,the rock type,physical properties and heterogeneity of Mawu member reservoir are analyzed. According to the research results,the reservoir is divided into three categories,of which class II reservoir is the main gas bearing interval in the area.