Geochemistry of deep coal-type gas and gas source rocks in Songliao Basin
The composition and carbon isotope composition of about 150 natural gas samples reveal that natural gases of deep strata in Songliao Basin are derived from multiple sources and the coal-type gases are widely distributed in the basin. Several gas fields show features of coal-type gases or contain coa...
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KeAi Communications Co., Ltd.
2009-06-01
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doaj-7ea4ce0383ce4f90a7c99f9bd144b8c72021-02-02T00:37:19ZengKeAi Communications Co., Ltd.Petroleum Exploration and Development1876-38042009-06-01363339346Geochemistry of deep coal-type gas and gas source rocks in Songliao BasinLuo Xia0Sun Fenjin1Shao Mingli2Wang Zhihong3Zeng Fuying4Zhao Zehui5Xia Li6He Feng7Langfang Branch, PetroChina Research Institute of Petroleum Exploration & Development, Langfang 065007, China; Corresponding authorLangfang Branch, PetroChina Research Institute of Petroleum Exploration & Development, Langfang 065007, ChinaExploration and Development Research Institute of PetroChina Jilin Oilfield Company, Songyuan 138000, ChinaLangfang Branch, PetroChina Research Institute of Petroleum Exploration & Development, Langfang 065007, ChinaLangfang Branch, PetroChina Research Institute of Petroleum Exploration & Development, Langfang 065007, ChinaLangfang Branch, PetroChina Research Institute of Petroleum Exploration & Development, Langfang 065007, ChinaChina University of Geosciences, Beijing 100083, ChinaChina University of Geosciences, Beijing 100083, ChinaThe composition and carbon isotope composition of about 150 natural gas samples reveal that natural gases of deep strata in Songliao Basin are derived from multiple sources and the coal-type gases are widely distributed in the basin. Several gas fields show features of coal-type gases or contain coal-type gases, with δ13C2 being larger than −28 ‰ and δ13CMCC6 being larger than −22‰, such as Shengping gas field in the north of the basin, Xiaohelong and Xiaochengzi gas fields in the south. Organic matter of source rocks in the deep strata is dominantly Type III, with a small portion of Type II. The average TOC of source rocks in the Shahezi (K1sh) Formation is 1.99%. Sedimentary facies studies of single wells, which penetrated coals of the Shahezi Formation, indicate that these coals are developed in peat swamps of deltaic plain, depressions between fan deltas, coastal shallow lakes, flooding plain etc, and structures are mainly distributed in the boundary of fault depressions, especially in their slope, some in the center of lakes. Key words: Songliao Basin, deep strata, coal-type gas, gas source rock, geochemical features, sedimentary environmenthttp://www.sciencedirect.com/science/article/pii/S1876380409601312 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Luo Xia Sun Fenjin Shao Mingli Wang Zhihong Zeng Fuying Zhao Zehui Xia Li He Feng |
spellingShingle |
Luo Xia Sun Fenjin Shao Mingli Wang Zhihong Zeng Fuying Zhao Zehui Xia Li He Feng Geochemistry of deep coal-type gas and gas source rocks in Songliao Basin Petroleum Exploration and Development |
author_facet |
Luo Xia Sun Fenjin Shao Mingli Wang Zhihong Zeng Fuying Zhao Zehui Xia Li He Feng |
author_sort |
Luo Xia |
title |
Geochemistry of deep coal-type gas and gas source rocks in Songliao Basin |
title_short |
Geochemistry of deep coal-type gas and gas source rocks in Songliao Basin |
title_full |
Geochemistry of deep coal-type gas and gas source rocks in Songliao Basin |
title_fullStr |
Geochemistry of deep coal-type gas and gas source rocks in Songliao Basin |
title_full_unstemmed |
Geochemistry of deep coal-type gas and gas source rocks in Songliao Basin |
title_sort |
geochemistry of deep coal-type gas and gas source rocks in songliao basin |
publisher |
KeAi Communications Co., Ltd. |
series |
Petroleum Exploration and Development |
issn |
1876-3804 |
publishDate |
2009-06-01 |
description |
The composition and carbon isotope composition of about 150 natural gas samples reveal that natural gases of deep strata in Songliao Basin are derived from multiple sources and the coal-type gases are widely distributed in the basin. Several gas fields show features of coal-type gases or contain coal-type gases, with δ13C2 being larger than −28 ‰ and δ13CMCC6 being larger than −22‰, such as Shengping gas field in the north of the basin, Xiaohelong and Xiaochengzi gas fields in the south. Organic matter of source rocks in the deep strata is dominantly Type III, with a small portion of Type II. The average TOC of source rocks in the Shahezi (K1sh) Formation is 1.99%. Sedimentary facies studies of single wells, which penetrated coals of the Shahezi Formation, indicate that these coals are developed in peat swamps of deltaic plain, depressions between fan deltas, coastal shallow lakes, flooding plain etc, and structures are mainly distributed in the boundary of fault depressions, especially in their slope, some in the center of lakes. Key words: Songliao Basin, deep strata, coal-type gas, gas source rock, geochemical features, sedimentary environment |
url |
http://www.sciencedirect.com/science/article/pii/S1876380409601312 |
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