Microstructural Analysis of Organic Matter in Shale

Topic Information

Dear Colleagues,

Organic matter is an important component the shale rocks; this is the basis of shale hydrocarbon generation. The spatial distribution, richness, type, pore structure, and maturity of organic matter can affect the resource evaluation process, development planning (i.e., hydraulic fracturing design), and target formation selection. Thus, understanding the properties of organic matter is vital. In this Topic, multiple studies related to the microstructures of organic matter will be published. Included topics include, but are not limited to, the following: the pore structures of organic matter; the mechanical properties of organic matter; the evaluation of the hydrocarbon generation potential of organic matter; the origins of organic matter; the flow of oil and gas in organic matter; the heterogeneity of organic matter.

Dr. Kouqi Liu
Prof. Dr. Mehdi Ostadhassan
Topic Editors

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Participating Journals

Journal Name	Impact Factor	CiteScore	Launched Year	First Decision (median)	APC
Energies energies	3.2	5.5	2008	16.1 Days	CHF 2600	Submit
Gases gases	-	-	2021	15.0 days *	CHF 1000	Submit
Geosciences geosciences	2.7	5.2	2011	23.6 Days	CHF 1800	Submit
Minerals minerals	2.5	3.9	2011	18.7 Days	CHF 2400	Submit

* Median value for all MDPI journals in the second half of 2023.

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14 pages, 6424 KiB  

Open AccessArticle

Petrographic Insights into the Evolution of Nano-Scale Organic Matter Pores with Organic Matter Conversion

by Lei Zhou, Xingqiang Feng, Linyan Zhang, Lin Wu and Rui Zhang

Minerals 2024, 14(2), 182; https://doi.org/10.3390/min14020182 - 08 Feb 2024

Viewed by 691

Abstract

To investigate the influence of organic matter conversion on the evolution of organic matter pores, fractional conversion (TR_HI) and loss of TOC (TOC_L) from the organic matter conversion of Middle Jurassic Dameigou Formation shale samples were calculated using [...] Read more.

To investigate the influence of organic matter conversion on the evolution of organic matter pores, fractional conversion (TR_HI) and loss of TOC (TOC_L) from the organic matter conversion of Middle Jurassic Dameigou Formation shale samples were calculated using petrographic analysis. The TR_HI of organic matter varies from 0.30 to 0.88 and TOC_L content ranges from 0.62% and 4.09%. Relative to samples of Type III organic matter in shales, type II samples exhibit higher TR_HI and TOC_L values. Petrographic calculations of TR_HI reveal that the fractional conversion of different kerogens differs for the same thermal maturity level. The specific surface area (S_BET) ranges between 1.25 and 6.63 m²/g and micropore surface area (S_mic) ranges between 4.16 and 21.27 m²/g. Correlations between pore structure parameters and TOC_L content are higher than those between pore structure parameters and TOC content. The original TOC content decreases with increasing maturity level owing to hydrocarbon generation from organic matter conversion. The development of organic matter pores depends mainly on organic matter conversion, which is influenced by the richness, organic maceral compositions, and thermal maturity of the organic matter. The contents of kaolinite, illite, and mixed-layer illite/smectite (I/S) in the studied shales are 17.83%–37.05%, 5.36%–11.31%, and 5.27%–14.36%, respectively. Pore structure parameters (S_BET and S_mic) exhibit moderate positive correlations with illite content and I/S content, and moderate negative correlations with kaolinite content, indicating that different clay minerals have differential effects on pore structure. Full article

(This article belongs to the Topic Microstructural Analysis of Organic Matter in Shale)

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