四川盆地元坝气田长兴组古油藏的定量恢复及油源分析

李平平; 郭旭升; 郝芳; 邹华耀; 余新亚; 王广伟

doi:10.3799/dqkx.2016.037

Volume 41 Issue 3

Mar. 2016

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Article Navigation > Earth Science > 2016 > 41(3): 452-462

Li Pingping, Guo Xusheng, Hao Fang, Zou Huayao, Yu Xinya, Wang Guangwei, 2016. Paleo-Oil-Reservoirs Reconstruction and Oil Correlation of Changxing Formation in the Yuanba Gas Field, Sichuan Basin. Earth Science, 41(3): 452-462. doi: 10.3799/dqkx.2016.037

Citation:

Li Pingping, Guo Xusheng, Hao Fang, Zou Huayao, Yu Xinya, Wang Guangwei, 2016. Paleo-Oil-Reservoirs Reconstruction and Oil Correlation of Changxing Formation in the Yuanba Gas Field, Sichuan Basin. Earth Science, 41(3): 452-462. doi: 10.3799/dqkx.2016.037

Citation:

Li Pingping, Guo Xusheng, Hao Fang, Zou Huayao, Yu Xinya, Wang Guangwei, 2016. Paleo-Oil-Reservoirs Reconstruction and Oil Correlation of Changxing Formation in the Yuanba Gas Field, Sichuan Basin. Earth Science, 41(3): 452-462. doi: 10.3799/dqkx.2016.037

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Paleo-Oil-Reservoirs Reconstruction and Oil Correlation of Changxing Formation in the Yuanba Gas Field, Sichuan Basin

doi: 10.3799/dqkx.2016.037

1.
State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China
2.
SINOPEC Exploration Company, Chengdu, Sichuan 610041, China
3.
Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences, Wuhan 430074, China

Received Date: 2015-08-23
Publish Date: 2016-03-15

Abstract

Abstract

The natural gases from the Changxing Formation (P₂ch) in the Yuanba gas field are mainly derived from oil cracking, but the volume of oil-cracking-gas has not been evaluated quantitatively and the source of the paleo-oil has not been studied systematically. Solid bitumen, commonly developed in the P₂ch reservoirs, is a direct product of oil cracking which had finished before the regional uplift and structure deformation in the Yuanba gas field. As a result, the paleo-oil zone can be recognized by the solid bitumen. Basing on the lateral and vertical distribution of solid bitumen, seven reliable and four probable paleo-oil reservoirs have been found out. The paleo-oil accumulated in these reservoirs by volumetric method is about 6.14×10⁸ t, and the corresponding oil-cracking-gas is about 3 807.08×10⁸ m³. The volume of oil-cracking-gas is much larger than the natural gas found in the Yuanba gas field, which indicates that the oil-cracking-gas can supply sufficient gases for the present gas reservoirs, and further proves that the natural gases are mainly derived from oil cracking. The δ¹³C correlation of solid bitumen and kerogens from different source rocks, and total organic carbon (TOC) data show that the paleo-oil was derived from type-Ⅱ source rock mainly in the Upper Permian Wujiaping Formation, and then in the Changxing/Dalong Formation. The latter is mainly developed in Guangyuan-Nanjiang-Tongjiang area, and the hydrocarbon generated by this source rock cannot be neglected during the natural gas exploration in this area.
- paleo-oil reservoir,
- oil correlation,
- petroleum geology,
- Yuanba gas field,
- Sichuan basin

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References(47)

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Paleo-Oil-Reservoirs Reconstruction and Oil Correlation of Changxing Formation in the Yuanba Gas Field, Sichuan Basin

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