烃源岩生气增压定量评价模型及影响因素

郭小文; 何生; 刘可禹; 董甜甜

doi:10.3799/dqkx.2013.123

Volume 38 Issue 6

Jun. 2013

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GUO Xiao-wen, HE Sheng, LIU Ke-yu, DONG Tian-tian, 2013. A Quantitative Estimation Model for the Overpressure Caused by Natural Gas Generation and Its Influential Factors. Earth Science, 38(6): 1263-1270. doi: 10.3799/dqkx.2013.123

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GUO Xiao-wen, HE Sheng, LIU Ke-yu, DONG Tian-tian, 2013. A Quantitative Estimation Model for the Overpressure Caused by Natural Gas Generation and Its Influential Factors. Earth Science, 38(6): 1263-1270. doi: 10.3799/dqkx.2013.123

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A Quantitative Estimation Model for the Overpressure Caused by Natural Gas Generation and Its Influential Factors

doi: 10.3799/dqkx.2013.123

GUO Xiao-wen^{1, 2
,},
HE Sheng¹,
LIU Ke-yu^{2, 3},
DONG Tian-tian⁴

1.
Key Laboratory of Tectonics and Petroleum Resources, Ministry of Education, China University of Geosciences, Wuhan 430074, China
2.
Research Institute of Petroleum Exploration and Development, Beijing 100083, China
3.
CSIRO Earth Science and Resource Engineering, BentleyWA 6102, Australia
4.
Liaohe Oilfield Subcompany, PetroChina, Panjin 124010, China

Received Date: 2012-11-24
Publish Date: 2013-06-01

Abstract

Abstract

It is very complicated to quantitatively estimate the overpressure caused by natural gas generation in the source rocks with type Ⅲ kerogen firstly due to the small amount of the associated oil to the dominant gas generated and secondly due to the fact that thermal cracking of liquid oil occurs with the increasing depth and temperature. In this paper, a quantitative estimation model for the overpressure change due to natural gas generation is proposed, taking into consideration the episodic natural gas leakage and expulsion, and parameters such as effect of hydrogen index on hydrocarbon generation, thermal cracking of liquid oil to natural gas, the compressibility of kerogen, oil and water, natural gas solution within the water and remaining oil, and so on. In addition, sensitivity analyses of parameters such as residual natural gas coefficient, TOC and hydrogen index have been carried out. Many parameters can affect overpressure due to natural gas generation including source rock porosity, maturity, organic matter abundance, residual natural gas coefficient and so on. Sensitivity analyses indicate that the hydrogen index is the most effective parameter on the pressure change due to natural gas generation in the source rocks and the residual natural gas coefficient has the least effect on the pressure change. Overpressure can be generated when the residual natural gas coefficient is as low to 0.2, suggesting that the pressure seal in the source rock is not the most important parameter for the overpressure development caused by natural gas generation in the source rocks.
- source rock,
- natural gas generated overpressure,
- quantitative model,
- sensitivity analysis,
- natural gas,
- residual coefficient,
- kerogen

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References(30)

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