气候变化领域集成服务门户(CCPortal): Origin of conventional and shale gas in Sinian–lower Paleozoic strata in the Sichuan Basin: Relayed gas generation from liquid hydrocarbon cracking

CCPortal

DOI	10.1306/11151817334
	Origin of conventional and shale gas in Sinian–lower Paleozoic strata in the Sichuan Basin: Relayed gas generation from liquid hydrocarbon cracking
	Zhao W.; Zhang S.; He K.; Zeng H.; Hu G.; Zhang B.; Wang Z.; Li Y.
发表日期	2019
ISSN	0149-1423
卷号	103 期号:6
英文摘要	Large amounts of natural gas have been discovered recently, both in carbonate reservoirs and in shales in the Sinian–Silurian strata of the Sichuan Basin, southern China. Although numerous studies have been conducted to learn about the accumulation of conventional and shale gas, the gas generation history, the origins of the two types of gas, and gas resources in the basin remain unclear. In this study, the hydrocarbon generation histories of Cambrian and Silurian source rocks were reconstructed on the basis of thermal history and hydrocarbon generation kinetic parameters. Intensive cracking of crude oil to generate considerable amounts of secondary cracking gas in Silurian and Cambrian formations occurred during deep burial. The high abundance of overmature pyrobitumen in carbonate reservoirs and shale demonstrates the occurrence of large-scale in situ cracking of liquid hydrocarbons. A mixing model was proposed to quantitatively determine the contribution of kerogen and oil-cracking gas in shale gas accumulations. The mixing of two thermogenic gases with different maturities resulted in a reversal and a rollover of the carbon isotope compositions of shale gas. Moreover, gas resources from the cracking of three occurrence states of liquid hydrocarbons—including dispersed residual bitumen in source rocks, dispersed oil outside the source, and accumulated oil in reservoirs—were evaluated in Sinian–Cambrian and Silurian petroleum systems in the Sichuan Basin, providing a guide for future deep gas exploration of similar formations in China and elsewhere. Copyright ©2019. The American Association of Petroleum Geologists. All rights reserved.
语种	英语
scopus关键词	Crude oil; Gas generators; Gases; Hydrocarbons; Liquids; Mixing; Petroleum geology; Petroleum reservoir evaluation; Petroleum reservoirs; Shale gas; Carbon isotope composition; Carbonate reservoir; Gas accumulation; Hydrocarbon-generation history; Hydrocarbon-generation kinetics; Liquid hydrocarbons; Petroleum systems; Secondary cracking; Petroleum prospecting; Cambrian; carbon isotope; cracking (fracture); hydrocarbon exploration; hydrocarbon generation; hydrocarbon reservoir; hydrocarbon resource; liquefied natural gas; natural gas; Ordovician-Silurian boundary; Paleozoic; petroleum hydrocarbon; shale gas; Silurian; Sinian; source rock; China; Sichuan Basin
来源期刊	AAPG Bulletin
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/125005
作者单位	Research Institute of Petroleum Exploration and Development, PetroChina, Beijing, China; Key Laboratory of Petroleum Geochemistry, China National Petroleum Corporation, Beijing, China; Bureau of Economic Geology, University of Texas at Austin, Austin, TX, United States
推荐引用方式 GB/T 7714	Zhao W.,Zhang S.,He K.,等. Origin of conventional and shale gas in Sinian–lower Paleozoic strata in the Sichuan Basin: Relayed gas generation from liquid hydrocarbon cracking[J],2019,103(6).
APA	Zhao W..,Zhang S..,He K..,Zeng H..,Hu G..,...&Li Y..(2019).Origin of conventional and shale gas in Sinian–lower Paleozoic strata in the Sichuan Basin: Relayed gas generation from liquid hydrocarbon cracking.AAPG Bulletin,103(6).
MLA	Zhao W.,et al."Origin of conventional and shale gas in Sinian–lower Paleozoic strata in the Sichuan Basin: Relayed gas generation from liquid hydrocarbon cracking".AAPG Bulletin 103.6(2019).