苏里格气田东二区致密砂岩储层裂缝与含气性的关系  

Relationship between gas bearing capacity and reservoir fractures of tight sand reservoirs in the eastern block 2 of the Sulige Gas Field

作　　者：李义军[1,2] 李进步[2] 杨仁超[3] 王言龙[3] 樊爱萍[3] 

机构地区：[1]成都理工大学能源学院 [2]中国石油长庆油田公司苏里格气田研究中心 [3]山东科技大学地质学院

出　　处：《天然气工业》2012年第6期28-30,105-106,共3页Natural Gas Industry

基　　金：山东省沉积成矿作用与沉积矿产重点实验室开放基金"陆相盆地沉积充填序列与储层发育控因研究"(编号:DMSM200803)

摘　　要：鄂尔多斯盆地苏里格气田东区砂岩储层岩性致密,已成为制约天然气规模开发的主要因素。为此,在岩心观察的基础上,采用薄片鉴定、扫描电镜、铸体、压汞等分析方法,对该气田东二区下二叠统山西组山1段和下石盒子组盒8段的储层进行了分析。结果发现:研究区北部砂岩储层中裂缝(裂缝类型主要为构造裂缝和成岩裂缝)较发育,对储层物性有明显的改善作用,而南部则未见到构造裂缝;构造裂缝与溶蚀裂缝均沿构造带边界分布,是致密储层渗透率提高的重要因素;裂缝发育层段,砂岩含气性明显变好。因此,把握裂缝的分布规律对于储层预测、寻找高产气藏、搞好天然气开发设计与施工等具有重要意义。The compacted rocks in the sandstone reservoirs are the main factor restricting the gas exploration and development in the eastern block of the Sulige Gas Field.In view of this,based on the core observation,such analysis methods as thin layer chromatography,scanning electron microscope,etc.are adopted to analyze the reservoirs in the 8th member of the Shihezhi Formation and the 1st member of the Shanxi Formation in the Permian Eastern Block 2 of this field.The following results are presented herein.In the northern sandstone reservoirs of this study area,the moderate fractures are relatively developed and are mainly divided into structural fractures and lithological fractures,which obviously contribute to the petrophysical properties of the reservoirs.In the southern sandstone reservoirs,the structural fractures have never been found yet.Both structural and erosional fractures are distributed along the margins of the structural belts,which are the main factor for improving the permeability of tight reservoirs.In the formations with well-developed fractures,the gas-bearing ability is obviously getting better.Therefore,a better understanding of the distribution laws of fractures will be of great significance to forecasting reservoirs,finding more high-deliverability gas reservoirs and making a better design and operation scheme associated with natural gas development.

关 键 词：鄂尔多斯盆地 苏里格气田 东二区 早二叠世 致密砂岩 储集层 裂缝(岩石) 天然气 含气性 

分 类 号：P618.13[天文地球—矿床学]