GENESIS AND SOURCES OF NON-CONVENTIONAL WATER SOLUBLE METHANE GAS IN GUSHI SAG

LIU Jian-chao; ZHANG Lin; WANG Xing-yun; BAI Jian-feng; FENG Long

Volume 20 Issue 1

Mar. 2014

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LIU Jian-chao, ZHANG Lin, WANG Xing-yun, et al., 2014. GENESIS AND SOURCES OF NON-CONVENTIONAL WATER SOLUBLE METHANE GAS IN GUSHI SAG. Journal of Geomechanics, 20 (1): 61-69.

Citation:

LIU Jian-chao, ZHANG Lin, WANG Xing-yun, et al., 2014. GENESIS AND SOURCES OF NON-CONVENTIONAL WATER SOLUBLE METHANE GAS IN GUSHI SAG. Journal of Geomechanics, 20 (1): 61-69.

Citation:

LIU Jian-chao, ZHANG Lin, WANG Xing-yun, et al., 2014. GENESIS AND SOURCES OF NON-CONVENTIONAL WATER SOLUBLE METHANE GAS IN GUSHI SAG. Journal of Geomechanics, 20 (1): 61-69.

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GENESIS AND SOURCES OF NON-CONVENTIONAL WATER SOLUBLE METHANE GAS IN GUSHI SAG

1.
College of Resources, Chang'an University, Xi'an 710054, China
2.
Shaanxi Jin'ao Energy Development Co., Ltd., Weinan 714000, Shaanxi, China
3.
Research Institute of Exploration and Development, PetroChina Yumen Oilfield Company, Jiuquan 735019, Gansu, China
4.
Team S00550 of Changqing Downhole Drilling, CNPC Chuanqing Drilling Engineering Company Limited, Qingyang 745113, China

More Information

Received: 2013-08-07
Published: 2014-03-01

Abstract

Abstract

The genetic types of water soluble methane gas in Gushi sag in Weihe Basin were studied. Research on carbon isotope δ¹³C₁ and content of heavy hydrocarbon in water soluble gas methane showed that the genetic types of water soluble methane gas in different formations were different. Water soluble gas in Neogene Zhangjiapo Formation was mainly biogenetic. It came from biological decomposition of dark grey muddy limestone with higher content of carbon, which was self-generated and self-reserved. Water soluble methane gas in the Lantian-Bahe Formation was mainly immature coal-type pyrolysis gas (coal humic pyrolysis gas), which came from the lower layer. Analysis of the carbon isotope of CO₂ showed that δ¹³C_CO₂ < -10‰, being typical crust source type of organic origin. This proved that the water soluble methane and CO₂ in the Lantian-Bahe Formation came from the lower strata. Combining the above results and ethane carbon isotope analysis, the authors concluded that the biogenetic pyrolysis gas probably existed in the lower strata.
- Gushi Sag,
- water-soluble methane,
- genetic type,
- biogas,
- shell source type

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References(10)

References

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