Grain Size Distribution of Organic Matter and Pyrite in Alum Shales Characterized by TIMA and Its Paleo-environmental Significance

XIE Xiao-min; LI Li; YUAN Qiu-yun; WU Fen-ting; LIN Jing-wen; DOU Hao-ran

doi:10.15898/j.cnki.11-2131/td.202007120103

Rock and Mineral Analysis > 2021 > 40(1): 50-60. > DOI: 10.15898/j.cnki.11-2131/td.202007120103

XIE Xiao-min, LI Li, YUAN Qiu-yun, WU Fen-ting, LIN Jing-wen, DOU Hao-ran. Grain Size Distribution of Organic Matter and Pyrite in Alum Shales Characterized by TIMA and Its Paleo-environmental Significance[J]. Rock and Mineral Analysis, 2021, 40(1): 50-60. DOI: 10.15898/j.cnki.11-2131/td.202007120103

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Grain Size Distribution of Organic Matter and Pyrite in Alum Shales Characterized by TIMA and Its Paleo-environmental Significance

1.
Key Laboratory of Oil and Gas Resources and Exploration Technology, Ministry of Education, College of Resources and Environment, Yangtze University, Wuhan 430100, China
2.
Nanjing Hongchuang Exploration Technology Service Co., LTD, Nanjing 211111, China

More Information

Received Date: July 11, 2020
Revised Date: August 02, 2020
Accepted Date: September 18, 2020
Published Date: January 27, 2021

Abstract

HIGHLIGHTS
(1) TIMA has been used to analyze the mineral phases and quantitative mineral composition.

(2) Grain size distribution of organic matter and pyrite has been characterized and its significance of the reductive sedimentary environment has been discussed.

(3) The sedimentary environment of Alum shales was a closed or sulfurized sedimentary water system.

ABSTRACT

BACKGROUNDAlum shale (Middle Cambrian to Lower Ordovician) is a set of significant marine source rock in Northern Europe, and the maturity is from immature to over mature. Because of high maturities of the Lower-Paleozoic marine source rocks in China, the immature-early mature Alum shales are important samples for the comparative studies of hydrocarbon generation potential. Thus, the analyses of organic matter, mineral composition and sedimentary characteristics of the Alum shale with low maturity, are the fundamental for the comparative studies on the Lower Paleozoic marine source rocks at home and abroad.
OBJECTIVESTo uncover the mineral and organic matter compositions, and the sedimentary characteristics of Alum shales.
METHODSBased on the organic carbon content (TOC) and organic petrological observations, the integrated mineral analysis (TIMA) technology was used to scan the sample. Scan parameters were refined to obtain the mineral composition, content and particle size distribution of shale.
RESULTSThe TOC and TRS contents of studied Alum shale (%Rb=0.3) were 11.16%-12.24% and 4.30%-5.31%, respectively. The maceral compositions included the lamalginite from planktonic algae degradation and vitrinite-like macerals from benthic algae. Solid bitumen filled in the fractures and pores. The organic matter (OM) and pyrite (Py) contents acquired from TIMA scanning analyses were 9.79%-10.64% and 4.17%-4.49%, respectively. The OM/Py ratios ranged from 2.18 to 2.55, similar to the C/S ratios from Rock-eval pyrolysis. Grain sizes of OM were 0.9-27.0μm, and 80% grains had sizes of 1.2-5.5μm. Grain size of Py distributed from 0.9 to 17.0μm, and the proportion of grains with the size of lower than 0.5μm was higher than 78%, indicating an oxygen-lacking or sulfurized environment.
CONCLUSIONSA combination of C/S ratio, and characteristics of organic petrology and Py grain size distribution indicates the Alum shale was deposited in a closed or sulfurized water system. A new technical support for the research of source rocks (including shale) in the field of petroleum geology is provided through the methods used and discussed in this study.
- TIMA technique,
- Alum shale,
- mineral composition,
- organic matter,
- pyrite,
- grain size distribution,
- sedimentary environment

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Grain Size Distribution of Organic Matter and Pyrite in Alum Shales Characterized by TIMA and Its Paleo-environmental Significance

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