Hydrocarbon evolution during pyrolysis of source rocks of Yacheng coal formation from the Yanan depression in the South China Sea

Liu YangKey Laboratory of Coalbed Methane Resources and Reservoir Formation Process, Ministry of Education, China University of Mining and Technology, Xuzhou, China;School of Resources and Earth Science, China University of Mining & Technology, Xuzhou, ChinaCorrespondence[email protected]

Yong QinKey Laboratory of Coalbed Methane Resources and Reservoir Formation Process, Ministry of Education, China University of Mining and Technology, Xuzhou, China;School of Resources and Earth Science, China University of Mining & Technology, Xuzhou, China

Shi YinKey Laboratory of Coalbed Methane Resources and Reservoir Formation Process, Ministry of Education, China University of Mining and Technology, Xuzhou, China;School of Resources and Earth Science, China University of Mining & Technology, Xuzhou, China

Yulin ShenKey Laboratory of Coalbed Methane Resources and Reservoir Formation Process, Ministry of Education, China University of Mining and Technology, Xuzhou, China;School of Resources and Earth Science, China University of Mining & Technology, Xuzhou, China

ABSTRACT

Closed-system pyrolysis experiments were conducted on coal and carbonaceous mudstone samples using gold tubes pressured to investigate the gas generation potential and evolution. The results indicate that the total gas potential of coal is 5 times that of carbonaceous mudstone, and the total oil concentration is 2.5 times that of carbonaceous mudstone. Methane continuously increased with increasing temperature of pyrolysis. The increase ratio of heavy hydrocarbon gas is the largest at low temperature. The gas evolution of both samples is controlled by activation energy. Coal can be divided into four stages, namely kerogen degradation, kerogen cracking, oil cracking, and C₂ cracking stage. Carbonaceous mudstone can be divided into kerogen cracking and oil cracking. The temperature of turning point for coal is higher than carbonaceous mudstone.

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Hydrocarbon evolution during pyrolysis of source rocks of Yacheng coal formation from the Yanan depression in the South China Sea

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Hydrocarbon evolution during pyrolysis of source rocks of Yacheng coal formation from the Yanan depression in the South China Sea

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