Mineralogical assemblage of Cambay Shale of North Cambay Basin, Gujarat, India

Sharma, Vaishali; Sircar, Anirbid

doi:10.1007/s13202-018-0505-9

Cited by 6 publications

(1 citation statement)

References 17 publications

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“…In the north tectonic blocks of the Cambay basin, illite, kaolinite, smectite, and chlorite were identified as the dominant clay minerals, with illite being the most abundant (62%-65%). Compared to other minerals, such as quartz and feldspar, these blocks' carbonate mineral content is relatively low (Sharma and Sircar, 2019). TOC contents, calculated via rock eval pyrolysis, range from 5.03 (CB-A) to 1.28 wt.% (CB-D) (Table 1).…”

Section: Mineralogy and Geochemical Propertiesmentioning

confidence: 99%

Concurrent influence of geological parameters on the integrated nano-pore structure and discretized pore families of the petroliferous Cambay shale assessed through multivariate dependence measure

et al. 2023

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Heterogeneous nanopore structure and distribution regulate the gas trapping, desorption kinetics, and diffusion in shale matrices. In shale, pores range from continuous micro- and mesopore size distributions, varying with organic (total organic matter-TOC) and inorganic constituents (clay content, Fe-bearing minerals, quartz, etc.). Previous research only showed a linear relationship of pore parameters with these intrinsic properties of shale, which limits our understanding of the concurrent influence of multiple intrinsic rock properties. As a result, in this work, we established multivariate dependency of nanopore structure, distribution, and complexity (from low-pressure N2 and CO2 sorption and small-angle scattering; SAXS/MSANS) in the previously little-studied Cambay shales and provided a better tool (partial least square regression) for analyzing the simultaneous effect of intrinsic shale properties on multiply connected pore-parameters. Furthermore, we discretized continuous pore-size distribution into individual pore families using deconvolution to understand the pore space better. Additionally, predicted shale formation environment in terms of deposition probability (P+) and dissolution probability (P−) using a dynamic model of the fractal interface by precipitation and dissolution. Our findings indicate that the Cambay shales have a high potential for future hydrocarbon exploration (S2: 2.42–12.04 mg HC/g rock), “very good” (2-4 wt.%) to “excellent” (>4 wt.%) TOC content, and thermally mature type II–III admixed and type III kerogen. Deconvolution of the micro- and mesopore size distributions reveals that pore width (w) ranges ∼15.30–35 nm occupies greater than 50% of the total pore volume, and its pore volume increases with the presence of quartz, Fe-bearing minerals, and clay content. However, pores with w∼ 3.60–15.30 nm increase exclusively with TOC. In the micro- and early mesopore region, pore volume decreases with TOC from w∼ 0.30–0.75 nm and increases with TOC from w∼ 0.75–3.60 nm. Furthermore, TOC in shale increases the specific surface area and pore volume (micro-, meso-, and total pores), enhancing both sorption and free gas storage capacities. Cambay shales were likely deposited in three distinct environments, with precipitation probability (P+) values of 1, 0.7–0.8, and 0.5, as revealed by a fractal dimension (Ds) analysis of multiple samples.

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Section: Mineralogy and Geochemical Propertiesmentioning

confidence: 99%

Concurrent influence of geological parameters on the integrated nano-pore structure and discretized pore families of the petroliferous Cambay shale assessed through multivariate dependence measure

et al. 2023

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Mössbauer Spectroscopic Study of Samples from Cambay Shale Formation, Cambay Basin, in Context of Shale Gas or Shale Oil

Bohra

Patel

Kumar

et al. 2020

Journal of the Geological Society of India

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In Cambay basin (India) a thick sedimentary sequence exits consisting of shales. This sequence is known as Cambay Shale Formation (both younger and older). In the present investigation 57Fe Mössbauer spectroscopy study was carried on samples of Cambay Shale Formation. These samples are collected from various depth interval from well UBER#2. Results thus obtained are also compared with the Mössbauer spectroscopic study already available on shale samples of (from Cambay Shale Formation) well K-263. It was found that samples from well UBER#2 show presence of iron mainly in clay forming minerals in Fe2+ state, but show no presence of pyrite or ferric sulphate minerals. In contrast sample studied from well K-263 show presence of iron mainly in pyrite and in ferric sulphate but iron clay minerals is absent in most of the samples. Implication of distribution of iron minerals in these wells is discussed in context of future shale oil and shale gas exploration from this basin.

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Multi-technique characterization of shale reservoir quality parameters

Sharma

Sircar

2020

Journal of Natural Gas Science and Engineering

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Mineralogical assemblage of Cambay Shale of North Cambay Basin, Gujarat, India

Cited by 6 publications

References 17 publications

Concurrent influence of geological parameters on the integrated nano-pore structure and discretized pore families of the petroliferous Cambay shale assessed through multivariate dependence measure

Concurrent influence of geological parameters on the integrated nano-pore structure and discretized pore families of the petroliferous Cambay shale assessed through multivariate dependence measure

Mössbauer Spectroscopic Study of Samples from Cambay Shale Formation, Cambay Basin, in Context of Shale Gas or Shale Oil

Multi-technique characterization of shale reservoir quality parameters

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