A review on shale gas prospect in Indian sedimentary basins
A review on shale gas prospect in Indian sedimentary basins
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印度沉积盆地页岩气前景评价
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
Mrinal K. Sen
中科院分区：
文献类型：
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作者：
K. Sain;M. Rai;Mrinal K. Sen
页岩气是一种被困在页岩中的天然气，页岩是细粒沉积岩。富含有机质的页岩由于盆地沉降而在最佳温压条件下生成烃类。一部分生成的碳氢化合物迁移并被困在可以通过标准技术进行商业生产的常规储层中。页岩既可以作为烃源岩，也可以作为储集岩。根据有机质的类型和成熟程度，非常规碳氢化合物可以是页岩油或页岩气或两者的组合。在印度的几个沉积盆地中有相当大的页岩层存款，其总有机质（TOC）含量和成熟度历史各不相同。Cambay、Krishna-Godavari、Cauvery和Damodar河谷是页岩气储层的四个主要盆地，这表现在页岩厚度相当大; TOC（2 - 6wt%）含量充足;热成熟度良好，镜质组反射率大于1.0。Vindhyan、Upper Assam、Pranhita-Godavari和拉贾斯坦邦盆地也是需要用地质科学方法探测的远景盆地。这些页岩储层中的气体可以存在于天然裂缝或孔隙空间内，或者作为有机物质上的吸附气体。它被认为是继天然气水合物和煤层气之后的下一代主要能源。
Shale gas is a natural gas trapped within shales, which are fine-grained sedimentary rocks. Hydrocarbons are generated from organic-rich shale under an optimal temperature-pressure condition due to basin subsidence. A part of the generated hydrocarbons migrates and gets trapped in conventional reservoirs that can be produced commercially by standard techniques. Shale can act as both source and reservoir rocks. Depending on the type of organic matter and maturation level, unconventional hydrocarbons could be shale oil or shale gas or a combination of both. There is a sizeable deposit of shale formations in several sedimentary basins of India with different total organic (TOC) content and maturity history. The Cambay, Krishna-Godavari, Cauvery and Damodar valley are the four major basins of shale gas reservoirs as indicated by considerable thickness of shales; sufficient TOC (2 to 6 wt%) content; and good thermal maturity with vitrinite reflectance of more than 1.0. The Vindhyan, Upper Assam, Pranhita-Godavari and Rajasthan basins are other prospective basins that need to be probed by geo-scientific methods. The gas in these shale reservoirs can occur within the natural fractures or pore spaces or as adsorbed gas on the organic matter. This is considered as the next generation major energy resource after gas hydrates and coal bed methane.