Abstract In the present study, Permian shale beds of Ib-River Mand-Raigarh Basin have been evaluated for insights of depositional conditions, organic, clay and mineral composition allied to shale matrix. The shale core samples were obtained during exploratory drilling and analysed for the properties like proximate, petrography, Rock-Eval, Total organic content (TOC), X-ray diffraction (XRD) and X-ray fluorescence (XRF). The values of vitrinite content and TOC varies from 2.00 to 16.20 (vol%) and 1.88–6.99 wt % with an average value of 10.34 (vol%) and 3.75 (wt.%) respectively, suggesting fair to excellent source rock potential of shale for gas. Whereas, results of the Rock-Eval pyrolysis indicated fair to very good source rock potential (S1: 0.04–0.22 and S2: 0.57–39.45). The indicator of thermal maturity parameters like Tmax (423–470 ᵒC) and VRo (0.64–0.96%), counsels moderately matured shales. The plot of hydrogen index (HI) vs oxygen index (OI), Tmax vs HI and TOC vs HI illustrated the presence of type II and III kerogen in studied shales. The uniformity in carbon conversion elucidates negligible effects of intrusive and basin tectonics on shale reservoir which is validated from the passive stable tectonic setting of Ib-River Mand-Raigarh basin which favours deposition of organic matter. The high percentage of quartz (26.30–57.60 vol%) signifying the resistive nature of SiO2 towards erosion and weathering. However, the negligible or typical absence of K-feldspar and a large percentage of kaolinite (16.80–53.30 vol%) attributed to the strong weathering process. Consequently, the instantaneous reduction condition supported the preservation and transformation of organic matter. The paper focuses on the significance of various essential parameters like depositional conditions, organic richness, the degree of maturation, clay types and mineral constituents on the gas genesis and storage. The parameters interpreted through facies and evolution history of the basin to evaluate the prospects of shale gas resource development in Ib-River Mand-Raigarh Basin, India.

中文翻译：

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印度 Ib-River Mand-Raigarh 盆地页岩气储层的有机矿物学见解

摘要 在本研究中，对 Ib-River Mand-Raigarh 盆地的二叠纪页岩层进行了评估，以了解与页岩基质相关的沉积条件、有机物、粘土和矿物组成。页岩岩心样品是在勘探钻井过程中获得的，并分析了近景、岩相学、Rock-Eval、总有机物含量 (TOC)、X 射线衍射 (XRD) 和 X 射线荧光 (XRF) 等特性。镜质体含量和 TOC 值从 2.00 到 16.20 (vol%) 和 1.88-6.99 wt% 不等，平均值分别为 10.34 (vol%) 和 3.75 (wt.%)，表明页岩的烃源岩潜力一般到优良为气体。而 Rock-Eval 热解的结果表明烃源岩潜力一般到非常好（S1：0.04-0.22 和 S2：0.57-39.45）。热成熟度参数如 Tmax (423–470 ᵒC) 和 VRo (0.64–0.96%) 的指标建议中等成熟的页岩。氢指数 (HI) 与氧指数 (OI)、Tmax 与 HI 以及 TOC 与 HI 的关系图说明了研究的页岩中存在 II 型和 III 型干酪根。碳转化的均匀性说明侵入性和盆地构造对页岩储层的影响可以忽略不计，这从有利于有机质沉积的 Ib-River Mand-Raigarh 盆地的被动稳定构造环境中得到验证。石英的高百分比 (26.30–57.60 vol%) 表明 SiO2 对侵蚀和风化的抵抗性。然而，钾长石和大量高岭石（16.80-53.30 vol%）的可忽略不计或典型缺失归因于强风化过程。最后，瞬时还原条件支持有机物的保存和转化。本文重点介绍了沉积条件、有机质丰富度、成熟度、粘土类型和矿物成分等各种基本参数对气成因和储量的重要性。通过盆地相和演化历史解释的参数来评估印度Ib-River Mand-Raigarh盆地页岩气资源开发的前景。