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Discussion of gas enrichment mechanism and natural gas origin in marine sedimentary basin, China

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Chinese Science Bulletin

Abstract

There are abundant natural gas resources in Chinese marine sedimentary basin. The exploration hot shots of natural gas are the Palaeozoic marine strata here in recent years, and several large scale gas fields have been discovered. Chinese Palaeozoic high-post matured and coal measure hydrocarbon source rocks are mainly prone to gas generation in the present. This research considered that gas source rocks and TSR are the key cause of gas enrichment of marine strata. High-quality argillaceous and coal measure hydrocarbon rocks are distributed widely in the Palaeozoic marine strata, which have been in highly matured phase in the present. The argillaceous source rock generally contains various sulfates that could accelerate crude oil cracking to gas for TSR occurrence, and coal measure source rock mainly generates gas, so Chinese marine basin gives priority to accumulating gas. Marine strata have not founded oil reservoirs in the Sichuan Basin and Ordos Basin, and they consist mainly of dry gas. Marine natural gases are the mixed gases of oil cracking gas and coal-formed gas in a general way, oil cracking gases contain usually some H2S and CO2. Hydrocarbon carbon isotopes are very complicated, and methane and ethane isotopic values bear apparent reversal caused by thermal evolution and mixing among different genetic types of natural gas. Coal-formed gases are the main component of Chinese marine natural gas. The Upper Permian of the Sichuan Basin and the Carboniferous-Permian of the Ordos Basin coal measure hydrocarbon source rock present large hydrocarbon generation potential, which are the prospecting highlight of marine natural gas hereafter. Oil cracking gas exploration will be paid much attention to in the Tarim Basin because of the lack of coal measure hydrocarbon source rock.

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Authors and Affiliations

  1. Research Center of Petroleum Geology, Research Institute of Petroleum Exploration and Development, PetroChina, Beijing, 100083, China

    Zhu GuangYou, Zhao WenZhi, Zhang ShuiChang, Liang YingBo & Wang ZhengJun

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  1. Zhu GuangYou
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  2. Zhao WenZhi
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  3. Zhang ShuiChang
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Correspondence to Zhu GuangYou.

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Supported by the National Natural Science Foundation of China (Grant No. 40602016) and PetroChina Science and Technology Risk Innovation Research Item

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Zhu, G., Zhao, W., Zhang, S. et al. Discussion of gas enrichment mechanism and natural gas origin in marine sedimentary basin, China. Chin. Sci. Bull. 52 (Suppl 1), 62–76 (2007). https://doi.org/10.1007/s11434-007-6016-6

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