陆相页岩气储层评价标准探讨——以延长组富有机质页岩为例  

Evaluation Criteria of Lake Facies Shale Gas Reservoir: A Case Study of the Organic Rich Shale Developed in Yanchang Group,Ordos Basin

作　　者：曾秋楠[1] 周新桂[1] 于炳松[2] 冯子齐[2] 苗淼[1] 

机构地区：[1]中国地质调查局油气资源调查中心,北京100029 [2]中国地质大学(北京),北京100029

出　　处：《新疆地质》2015年第3期409-414,共6页Xinjiang Geology

摘　　要：页岩气是近年来新兴的一种非常规天然气,目前我国陆相页岩气储层尚无评价标准和规范。以鄂尔多斯盆地延长组长7-长9段内富有机质页岩为例,通过有机碳含量、Ro、X射线衍射粘土矿物及全岩分析、页岩等温吸附测试、岩石比表面和孔径分布等一系列测试,总结陆相页岩的基本特征,探讨了陆相页岩气储层的评价方案和标准。结合前人相关研究成果,对陆相页岩气储层作出定义,指出泥页岩中所含夹层及夹层所占比例是定义页岩气储层关键,选取储层厚度、夹层比、有机碳含量、有机质成熟度、脆性矿物含量及页岩孔隙度等作为储层评价主要参数,结合研究区陆相页岩测试数据,给出陆相页岩气储层评价标准,认为依据上述6个因素,可将陆相页岩气储层分为3类,其中I类储层应满足储层厚度大于30 m、TOC大于2%、Ro在1%~3%、夹层比大于20%,或夹层比小于30%,但页岩中脆性矿物含量大于60%、孔隙度大于2%条件。Shale gas is a kind of arisen unconventional gas resources. In current evaluation and study,there are no systematic methods and criteria both at home and abroad.The shale bed rich in organic matter of Yanchang Formation of Ordos Basin is sampled and tested as a representative of lake facies shale, to discuss the evaluation criteria of lake facies shale gas reservoir,based on a series of monitoring for TOC, Ro, quantitative analysis of mineral components by x-ray diffraction, isothermal adsorption and BET surface area and pore distribution.With former study considered, the study defined the shale gas reservoir, naming that thickness, interlayer proportion、, TOC, Ro, brittle mineral content and porosity are the key factors to evaluate the reservoir. Finally, with the test result considered, an evaluation criteria is suggested,according to which the lake facies shale gas reservoir could be classified as good, normal and poor. The good reservoir should satisfied the following standards： thickness over 30 m, TOC2% and 1%Ro3% while the interlayer proportion is more than 20%; or brittle mineral content over 60% and porosity over 2%, while the interlayer proportion is less than 20%.

关 键 词：鄂尔多斯盆地 储层评价标准 页岩气 富有机质页岩 陆相 延长组 

分 类 号：P618.13[天文地球—矿床学]