Polyphase thermal evolution in the Infra-Cambrian Ara Group (South Oman Salt Basin) as deduced by maturity of solid reservoir bitumen

Schoenherr, Johannes; Littke, Ralf; Urai, János L.; Kukla, Peter A.; Rawahi, Zuwena

doi:10.1016/j.orggeochem.2007.03.010

Cited by 308 publications

(142 citation statements)

References 38 publications

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“…Little vitrinite can be found in marine shale samples in general but solid bitumen reflectance (BRr) can take the place of vitrinite reflectance (VRr) based on the equation VRr = (BRr + 0.2443)/1.0495 [26]. Reflectance values were tested using random solid bitumen in non-polarized light under oil immersion and at least 20 readings were taken for each sample.…”

Section: Experimental Methodsmentioning

confidence: 99%

Pore Structure and Fractal Characteristics of Niutitang Shale from China

Tang

Wang

et al. 2018

Minerals

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A suite of shale samples from the Lower Cambrian Niutitang Formation in northwestern Hunan Province, China, were investigated to better understand the pore structure and fractal characteristics of marine shale. Organic geochemistry, mineralogy by X-ray diffraction, porosity, permeability, mercury intrusion and nitrogen adsorption and methane adsorption experiments were conducted for each sample. Fractal dimension D was obtained from the nitrogen adsorption data using the fractal Frenkel-Halsey-Hill (FHH) model. The relationships between total organic carbon (TOC) content, mineral compositions, pore structure parameters and fractal dimension are discussed, along with the contributions of fractal dimension to shale gas reservoir evaluation. Analysis of the results showed that Niutitang shale samples featured high TOC content (2.51% on average), high thermal maturity (3.0% on average), low permeability and complex pore structures, which are highly fractal. TOC content and mineral compositions are two major factors affecting pore structure but they have different impacts on the fractal dimension. Shale samples with higher TOC content had a larger specific surface area (SSA), pore volume (PV) and fractal dimension, which enhanced the heterogeneity of the pore structure. Quartz content had a relatively weak influence on shale pore structure, whereas SSA, PV and fractal dimension decreased with increasing clay mineral content. Shale with a higher clay content weakened pore structure heterogeneity. The permeability and Langmuir volume of methane adsorption were affected by fractal dimension. Shale samples with higher fractal dimension had higher adsorption capacity but lower permeability, which is favorable for shale gas adsorption but adverse to shale gas seepage and diffusion.

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Section: Experimental Methodsmentioning

confidence: 99%

Pore Structure and Fractal Characteristics of Niutitang Shale from China

Tang

Wang

et al. 2018

Minerals

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“…Due to general lack of vitrinite in marine shales older than Ordovician, the reflectance of solid bitumen was determined for a polished shale slab using a Leica DMR-X microscope. The EVRo was obtained from the formula EVRo ¼ (BRo þ 0.2443)/1.0495 (Schoenherr et al, 2007), where BRo is the measured reflectance value of solid bitumen. For comparison, the EVRo value of the solid bitumen was also determined from the Raman spectra, which in shale was measured by a micro-laser Raman spectroscope (HORIBA-JY Xplora); the EVRo value was calculated from the formula EVRo ¼ 1.1659 Â h(Dh/Gh) þ 2.7588 (Liu et al, 2013), where h(Dh/Gh) is the Raman peak height ratio in which Dh and Gh are the heights of peak D and peak G, respectively.…”

Section: Organic Geochemical Analysismentioning

confidence: 99%

Composition and pore characteristics of black shales from the Ediacaran Lantian Formation in the Yangtze Block, South China

Zeng

Jia

Peng

et al. 2016

Marine and Petroleum Geology

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“…Solid bitumen is a type of organic matter extensively occurring in petroleum-bearing basins and also in Precambrian shale-rich strata (Jacob, 1989;Lomando, 1992;Schoenherr et al, 2007). Available data indicate that despite the fact that solid bitumen is different from coal in their precursors, their Raman spectral characteristics and related changes in the process of thermal maturation are very similar (Court et al, 2007;Jehlicka et al, 2003).…”

Section: Introductionmentioning

confidence: 99%