摘要
根据野外露头地质调查、最新钻井及样品测试等基础资料,以富有机质页岩形成的地质背景及展布特征——页岩气聚集条件—勘探有利区预测为主线,对黔西北地区上奥陶统五峰组—下志留统龙马溪组页岩气成藏条件进行分析,并采用综合信息叠合法对黔西北地区有利区进行预测。研究发现,页岩气发育的富有机质页岩段主要位于五峰组和龙马溪组底部,具有分布面积广、厚度大、有机质含量高、有机质类型好等特点,且具有充足的储集空间和运移通道。现场解吸实验表明,该套富有机质页岩具有良好的含气性能。总体分析,该区域与北美典型页岩气盆地具有良好的地质对比性,具有良好的页岩气聚集条件,是页岩气勘探研究以及后期页岩气开发的重要领域。
The paper primarily studied the geological background of organic rich shale and its distribution characteristics, reservoir forming conditions and potential favorable areas of shale gas reservoir development. The study started from basic data such as the field surface outcrops, underground core and laboratory test results, and by the analysis of the accumulation conditions of shale gas in Northwest Guizhou, and using comprehensive information method, the favorable areas were predicted. The results indicate that the organic rich shale is at the bottom of the Upper Ordovician Longmaxi Formation and Lower Silurian Wufeng Formation. The organic rich shale in the study area were characterized by wide distribution, great thickness, good organic type, high organic content, high organic thermal evolution degree and high hydrocarbon potentials. The shale is rich in brittle minerals, with great quantity of matrix micropore and cracks, and good reservoir conditions, which offered sufficient accumulated space and migration pathway for shale gas. The result of well site desorption test showed that the black shale all have high performance of gas adsorption. In a word, the tectonic evolution characteristics and geological conditions in this area are similar to the typical shale gas basins in America, and the study area is a favorable and prospective place for shale gas exploration, having lots of advantages for forming shale gas reservoir.
出处
《地质论评》
CAS
CSCD
北大核心
2015年第1期155-162,共8页
Geological Review
基金
国家自然科学基金项目(编号41102088
41272167)
全国油气资源战略选区调查与评价专项(编号2009GYXQ-15)的成果
关键词
上奥陶统五峰组
下志留统龙马溪组
页岩气
贵州
Upper Ordovician Wufeng Formation
Lower Silurian Longmaxi Formation
shale gas
NorthwestGuizhou Province
