Genetic and source differences of gases in the Middle Permian Qixia and Maokou formations in the Sichuan Basin, SW China
Shipeng Huang
1
,
Qingchun Jiang
1
,
Hua Jiang
1
,
Qingsong Tang
2
,
Fangming Zeng
1
,
Wenjun Lu
1
,
HAO CHEN
1
,
Miao Yuan
1
,
Ya Wu
2
1
PetroChina, Research Institute of Petroleum Exploration and Development, Beijing 100083, China
|
2
PetroChina Southwest Oil & Gas Field Company, Chengdu, Sichuan 610041, China
|
Publication type: Journal Article
Publication date: 2023-04-01
scimago Q2
wos Q2
SJR: 0.733
CiteScore: 5.0
Impact factor: 2.5
ISSN: 01466380, 18735290
Geochemistry and Petrology
Abstract
The Middle Permian Qixia and Maokou formations (Fms), are important targets for current gas exploration in the Sichuan Basin. In recent years, high-yield industrial gas flow has been obtained in different structural zones of the basin. Based on the molecular and isotopic compositions of natural gas and reservoir bitumen, biomarker composition, and geological conditions, the genetic types, maturity, and sources of natural gas reservoired in the Qixia and Maokou Fms in different structural zones in the basin were analyzed. The following conclusions can be drawn: (1) the molecular and isotopic compositions of natural gas reservoired in the Middle Permian Qixia and Maokou Fms from different areas in the Sichuan Basin differ considerably; (2) the Middle Permian natural gas is oil-type gas, which is mainly generated by oil cracking; (3) most of the natural gas reservoired in the Qixia and Maokou Fms in the Sichuan Basin has reached the over-mature stage. The maturity of the natural gas from the northwestern Sichuan Basin is the highest, followed by gas from eastern and southern Sichuan, and part of natural gas in Southern Sichuan is high-maturity; (4) except for the slight thermochemical sulfate reduction (TSR) secondary alteration in the central Sichuan Basin, an effect of TSR was not observed in other areas; and (5) natural gas is controlled by the regional hydrocarbon kitchen. Gas in the eastern and southern Sichuan areas mainly originates from the Lower Silurian Longmaxi Fm shale, with a small contribution from marl in the Maokou Fm. The gas of the first member of the Maokou Fm has self-generation and self-storage characteristics, with a small contribution of the Longmaxi Fm shale. The Middle Permian gas in northwestern Sichuan is a mixture of gas generated from source rocks of the Lower Cambrian Qiongzhusi and Maokou Fms, whereas that in central Sichuan mainly originates from source rocks of the Qiongzhusi Fm. The Middle Permian gas in southwestern Sichuan mainly originates from its own source rock, and the natural gas reservoired in Permian volcanic rocks in the Chengdu–Jianyang area was generated by the mudstone of the Qiongzhusi Fm.
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GOST
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Huang S. et al. Genetic and source differences of gases in the Middle Permian Qixia and Maokou formations in the Sichuan Basin, SW China // Organic Geochemistry. 2023. Vol. 178. p. 104574.
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Huang S., Jiang Q., Jiang H., Tang Q., Zeng F., Lu W., CHEN H., Yuan M., Wu Ya. Genetic and source differences of gases in the Middle Permian Qixia and Maokou formations in the Sichuan Basin, SW China // Organic Geochemistry. 2023. Vol. 178. p. 104574.
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TY - JOUR
DO - 10.1016/j.orggeochem.2023.104574
UR - https://doi.org/10.1016/j.orggeochem.2023.104574
TI - Genetic and source differences of gases in the Middle Permian Qixia and Maokou formations in the Sichuan Basin, SW China
T2 - Organic Geochemistry
AU - Huang, Shipeng
AU - Jiang, Qingchun
AU - Jiang, Hua
AU - Tang, Qingsong
AU - Zeng, Fangming
AU - Lu, Wenjun
AU - CHEN, HAO
AU - Yuan, Miao
AU - Wu, Ya
PY - 2023
DA - 2023/04/01
PB - Elsevier
SP - 104574
VL - 178
SN - 0146-6380
SN - 1873-5290
ER -
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@article{2023_Huang,
author = {Shipeng Huang and Qingchun Jiang and Hua Jiang and Qingsong Tang and Fangming Zeng and Wenjun Lu and HAO CHEN and Miao Yuan and Ya Wu},
title = {Genetic and source differences of gases in the Middle Permian Qixia and Maokou formations in the Sichuan Basin, SW China},
journal = {Organic Geochemistry},
year = {2023},
volume = {178},
publisher = {Elsevier},
month = {apr},
url = {https://doi.org/10.1016/j.orggeochem.2023.104574},
pages = {104574},
doi = {10.1016/j.orggeochem.2023.104574}
}