古地理学报Issue(3)：381-392,12.DOI:10.7605/gdlxb.2015.03.032
柴达木盆地西部地区古近系下干柴沟组咸化湖相泥页岩储集层特征
Reservoir characteristics of salt-water lacustrine shale of the Paleogene Xiaganchaigou Formation in western Qaidam Basin
摘要
Abstract
Great breakthrough has been made in the exploration of lacustrine shale gas in China,but little research on reservoir of salt-water lacustrine shale was carried out.Organic geochemical analysis, mineral composition analysis and pore structure analysis of reservoir of the Palaeogene Xiaganchaigou For-mation lacustrine shale in western Qaidam Basin has been done by the authors.(1 ) The organic content has intense heterogeneity in the 0.1 2%~1 .35% range,the content of chloroform bitumen “A” is high <br> and the organic matter is mainly of type Ⅱ.(2) The content of carbonate is the highest with an average of 27.8%,and then clay minerals and quartz.There are 38.2% of the samples have anhydrite,which re-flects the typical salt-water lacustrine environments.(3)The organic matter micro-pores observed in the SEM are less developed,the shape is irregular and pore size is large.Intergranular pores are mainly mi-cronl-sized in diameter,while micro-fractures are mainly less than 1 μm in width.Mesopores have most of specific surface area and pore volume of shale pores,and are main places for gas adsorption and storage. The chloroform bitumen “A” influenced the pore structure of the samples.(4) The content of clay min-erals is low and brittle minerals is high in research area,which is comparable with the series of gas-contai-ning shales in U.S.and with the Lower Paleozoic shale in the Sichuan Basin,are conducive to creating cracks,and are easy for fracturing.关键词
储集层/氯仿沥青 “A”/泥页岩/咸化湖盆/古近系/柴达木盆地Key words
reservoir/chloroform bitumen “A”/shale/salt-water lacustrine basin/Palaeogene/Qaidam Basin分类
天文与地球科学引用本文复制引用
原园,姜振学,李卓,赵若彤,李鹏,崇明浩..柴达木盆地西部地区古近系下干柴沟组咸化湖相泥页岩储集层特征[J].古地理学报,2015,(3):381-392,12.基金项目
国家科技重大专项“页岩气成藏主控因素研究”（编号2011 ZX05018－002）资助 （）
