Geochemical characteristics of natural gas in tight sandstone of the Chengdu large gas field, Western Sichuan Depression, Sichuan Basin, China

SINOPEC has made significant progress in natural gas exploration in terrigenous tight sandstone in the Western Sichuan Depression, making it one of the predominant exploration areas in the Sichuan Basin. Although the Chengdu large gas field was located in the main reservoirs of Upper Jurassic tight...

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Autores principales:	Xiaoqi Wu, Yingbin Chen, Yanqing Wang, Huasheng Zeng, Xiaoqiong Jiang, Ye Hu
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Western Sichuan Depression Chengdu gas field Tight sandstone gas Geochemical characteristics Thermal maturity Gas industry TP751-762
Acceso en línea:	https://doaj.org/article/d92f6a0eeedf4d53a511d450d4cf2b29
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spelling	oai:doaj.org-article:d92f6a0eeedf4d53a511d450d4cf2b292021-11-22T04:28:15ZGeochemical characteristics of natural gas in tight sandstone of the Chengdu large gas field, Western Sichuan Depression, Sichuan Basin, China2468-256X10.1016/j.jnggs.2021.09.003https://doaj.org/article/d92f6a0eeedf4d53a511d450d4cf2b292021-10-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2468256X21000547https://doaj.org/toc/2468-256XSINOPEC has made significant progress in natural gas exploration in terrigenous tight sandstone in the Western Sichuan Depression, making it one of the predominant exploration areas in the Sichuan Basin. Although the Chengdu large gas field was located in the main reservoirs of Upper Jurassic tight sandstone, few geochemical proofs were presented to support the explanation of the gas source, and regional differences in natural gas have been poorly investigated. The Jurassic tight gas in the Chengdu large gas field has a dryness coefficient (C1/C1-5) of 0.939–0.982, and the δ13C1, δ13C2, and δD1 values range from −33.7‰ to −30.7‰, −25.4‰ to −22.3‰, and −162‰ to −153‰, respectively, with positive carbon and hydrogen isotopic series of gaseous alkanes. The carbon and hydrogen isotopic compositions of the Jurassic tight gas indicate that it is typically coal-derived gas. The measured vitrinite reflectance (RO) values of source rocks of Member 5 of the Xujiahe Formation, which are demonstrated as the main source of Jurassic tight gas, are consistent with the calculated RO values according to the two-stage fractionation model of coal-derived gas. Effective source rocks are rare in the Lower Jurassic Baitianba Formation of the study area, which is considered to have only a minor contribution to the Jurassic gas reservoirs. The geochemical characteristics of Jurassic natural gas from various gas fields in the Western Sichuan Depression vary depending on the effect of different gas sources and accumulation processes.Xiaoqi WuYingbin ChenYanqing WangHuasheng ZengXiaoqiong JiangYe HuElsevierarticleWestern Sichuan DepressionChengdu gas fieldTight sandstone gasGeochemical characteristicsThermal maturityGas industryTP751-762ENJournal of Natural Gas Geoscience, Vol 6, Iss 5, Pp 279-287 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Western Sichuan Depression Chengdu gas field Tight sandstone gas Geochemical characteristics Thermal maturity Gas industry TP751-762
spellingShingle	Western Sichuan Depression Chengdu gas field Tight sandstone gas Geochemical characteristics Thermal maturity Gas industry TP751-762 Xiaoqi Wu Yingbin Chen Yanqing Wang Huasheng Zeng Xiaoqiong Jiang Ye Hu Geochemical characteristics of natural gas in tight sandstone of the Chengdu large gas field, Western Sichuan Depression, Sichuan Basin, China
description	SINOPEC has made significant progress in natural gas exploration in terrigenous tight sandstone in the Western Sichuan Depression, making it one of the predominant exploration areas in the Sichuan Basin. Although the Chengdu large gas field was located in the main reservoirs of Upper Jurassic tight sandstone, few geochemical proofs were presented to support the explanation of the gas source, and regional differences in natural gas have been poorly investigated. The Jurassic tight gas in the Chengdu large gas field has a dryness coefficient (C1/C1-5) of 0.939–0.982, and the δ13C1, δ13C2, and δD1 values range from −33.7‰ to −30.7‰, −25.4‰ to −22.3‰, and −162‰ to −153‰, respectively, with positive carbon and hydrogen isotopic series of gaseous alkanes. The carbon and hydrogen isotopic compositions of the Jurassic tight gas indicate that it is typically coal-derived gas. The measured vitrinite reflectance (RO) values of source rocks of Member 5 of the Xujiahe Formation, which are demonstrated as the main source of Jurassic tight gas, are consistent with the calculated RO values according to the two-stage fractionation model of coal-derived gas. Effective source rocks are rare in the Lower Jurassic Baitianba Formation of the study area, which is considered to have only a minor contribution to the Jurassic gas reservoirs. The geochemical characteristics of Jurassic natural gas from various gas fields in the Western Sichuan Depression vary depending on the effect of different gas sources and accumulation processes.
format	article
author	Xiaoqi Wu Yingbin Chen Yanqing Wang Huasheng Zeng Xiaoqiong Jiang Ye Hu
author_facet	Xiaoqi Wu Yingbin Chen Yanqing Wang Huasheng Zeng Xiaoqiong Jiang Ye Hu
author_sort	Xiaoqi Wu
title	Geochemical characteristics of natural gas in tight sandstone of the Chengdu large gas field, Western Sichuan Depression, Sichuan Basin, China
title_short	Geochemical characteristics of natural gas in tight sandstone of the Chengdu large gas field, Western Sichuan Depression, Sichuan Basin, China
title_full	Geochemical characteristics of natural gas in tight sandstone of the Chengdu large gas field, Western Sichuan Depression, Sichuan Basin, China
title_fullStr	Geochemical characteristics of natural gas in tight sandstone of the Chengdu large gas field, Western Sichuan Depression, Sichuan Basin, China
title_full_unstemmed	Geochemical characteristics of natural gas in tight sandstone of the Chengdu large gas field, Western Sichuan Depression, Sichuan Basin, China
title_sort	geochemical characteristics of natural gas in tight sandstone of the chengdu large gas field, western sichuan depression, sichuan basin, china
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/d92f6a0eeedf4d53a511d450d4cf2b29
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Geochemical characteristics of natural gas in tight sandstone of the Chengdu large gas field, Western Sichuan Depression, Sichuan Basin, China

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