A discussion on gas sources of the feixianguan formation H(2)S-rich giant gas fields in the northeastern Sichuan Basin

作者：Zhang Shui Chang^*; Zhu Guang You; Chen Jian Ping; Liang Ying Bo

来源：Chinese Science Bulletin, 2007, 52: 113-124.

DOI：10.1007/s11434-007-6014-8

• feixianguan formation
• gasfield group
• gas source
• hydrogen sulfide
• TSR
• the Sichuan basin

In recent years several H(2)S-rich oolite giant gas pools have been discovered in the Lower Triassic Feixianguan Formation of the northeastern Sichuan basin, and their explored gas reserves have been over 5000x10(8) m(3). However, gas sources remain unsolved due to multiple source horizons with high maturity in this area and TSR alterations. By integrating analytical data of natural gas samples with conprehensive investigations on many factors, such as oil-gas geology, distribution and evolution of source rocks, charging and adjustment of gas pools, mixture of natural gases and secondery alterations, the present study concluded that the dominant source for the Feixianguan Fr. gas pools is the Permian Longtan Fr. source rock and secondly the Silurian Longmaxi Fr. source rock. Natural gases from the various gas pools differ genetically due to the matching diversity of seal configurations with phases of hydrocarbon generation and expulsion by different source rocks, among which natural gases in Puguang Gasfield are dominated by the trapped gas generated from the Longtan Fr. source rock and commingled with the gas cracked from the Silurian crude oil, while those in Dukouhe, Tieshangpo and Luojiazhai Gasfields are composed mainly of the Silurian oil-cracking gas and commingled with the natural gas derived from the Longtan Fr. source rock.

• 出版日期2007-11
• 单位中国石油天然气股份有限公司勘探开发研究院