鄂尔多斯盆地中东部上古生界页岩气资源潜力评价  

Evaluation of Shale Gas Resource Potential in Upper Paleozoic of Eastern-Central Ordos Basin

作　　者：刘飞[1,2] 马军[1,2] 吴凯[1,2] 李善鹏[1,2] 昝川莉[1,2] 罗丽荣[1,2] 

机构地区：[1]中国石油长庆油田分公司勘探开发研究院 [2]低渗透油气田勘探开发国家工程实验室

出　　处：《低渗透油气田》2013年第3期1-7,共7页

基　　金：国家科技重大专项“全球油气资源评价研究项目”（编号：2008E-0502）资助.

摘　　要：通过对鄂尔多斯盆地上古生界厚层状泥质岩层与国外成功开采页岩气的地层在储层地球化学特征、岩石矿物学特征、物性特征、含气性特征等各方面的综合对比，以及对鄂尔多斯盆地上古生界页岩气资源潜力的综合分析，系统地研究了页岩的含气性。鄂尔多斯盆地中东部上古生界山西组山2段厚层状泥质岩分布面积广、厚度大；有机质丰度较高，有机碳含量（TOC）平均为1．94％；有机质类型主要为腐殖型；成熟度较高，尤其在研究区中南部R2超过1．5％，为有利页岩气成藏区域；石英含量高一较高，脆性较强，但矿物颗粒间以泥质支撑为主；孔隙度低、渗透率低，但在氩离子抛光一扫描电子显微镜下观察．泥质岩存在微米级孔隙．黏土矿物间发育纳米级孔隙，并可见微裂缝。通过等温吸附实验、含气饱和度测定、孔隙度测定与现场取心罐装样品气体解析实验相结合，确定了厚层状泥质岩的总合气量，指出了上古生界页岩气成藏有利目标区域并计算了有利区域的页岩气资源量。By comprehensive comparisons of the geochemical, rock mineznlogical, physical properties, gas-bearing characteristics etc. of the thick- bedded argillite （argillaceous rock） reservoirs of Upper Paleozoic in the Ordos Basin and the reservoirs with successfully-developed shale gas in foreign countries, the gas-bearing property of the shale is systematically studied in this paper, through integrated analysis of resource potentials of the Upper Paleozoic shale gas in Ordos Basin. The thick-bedded argillite of the Shanxi Formation Shan2 Member is widely distributed in Upper Paleozoic of Ordos Basin with big thickness and high abundance of organic matter （TOC average 1.94%）. The organic matter are mainly tlumus type with high malurity, especially in the south-central part of tbe study area. The Ro value of the argillile exceeds 1.5%, being the favorable zone for shale gas to accumulate to form a gas reservoir. The quartz content in the thick-bedded argillite is high with strong brittleness, but the mineral particles are propped up maitlly by argillaceous matter. The thick-bedded argillite is of low porosity, and low permeability, but being observed under the Argon ion polishing - scanning electron microscope, there are micron pores in the argillaceous ruck, and nanometer-scale pores developed in the clay minerals, with micro-cracks. By isothernml adsorption experiments, gas saturation measuremenl, potvsity determination and combined with on-sile coring canned-sample gas analytical experimeul. The authors determine the total gas content of the Ihick-bedded argillite, and point out the favorable target regions for Paleozoic shale gas reservoir and calculate the volume of shale gas resources of the favorable regions.

关 键 词：鄂尔多斯盆地 上古生界 厚层状泥质岩 页岩气 资源潜力 含气性 纳米孔隙 资源量 

分 类 号：P618.130.2[天文地球—矿床学]