摘要
对鄂尔多斯盆地上古生界厚层状泥质岩层的储层地球化学特征、岩石矿物学特征、物性特征、含气性特征等方面进行了分析。认为鄂尔多斯盆地上古生界山西组山2段厚层状泥质岩分布面积广、厚度大;有机质丰度较高,有机质类型主要为腐殖型;成熟度较高,为有利页岩气成藏区域;石英含量高-较高,脆性较强,以泥质支撑为主,孔隙度低,渗透率低,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含气量,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.
出处
《天然气勘探与开发》
2013年第3期7-12,1-2,共6页
Natural Gas Exploration and Development
基金
国家科技重大专项"全球油气资源评价研究"(2008E-0502)资助
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
Ordos Basin： Upper Paleozoic： thick-bedded argillite, shale gas
resources potential
gas-bearing property
nanometer-peres
volume of resources
