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《Petroleum Exploration and Development》 2005-04
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Relationship between palaeoenvironment and the distribution of H_2S in Feixianguan Formation, NE Sichuan Province

ZHU Guang-you, ZHANG Shui-chang, LIANG Ying-bo(Research Institute of Petroleum Exploration& Development,PetroChina,Beijing 100083, China)  
The H_2S gases produced from Feixianguan Formation (T_ 1 f), NE Sichuan Province, are generated from TSR origin. The research of the paleoenvironment such as distribution of gypsiferous rocks, gas sources and reservoir temperature, and reservoir formation conditions demonstates that ample gas sources and high reservoir temperature are the basic conditions for TSR, and the distribution of the gypsiferous rocks is the key controlling factor of the H_2S formation and distribution. The differences of sedimentary palaeoenvironments in the eastern and western sides of the Kaijiang-Liangping trough result in the development of thin gypsiferous rocks within oolitic reservoirs to the east of the trough, and thus cause the formation of giant gas fields with a high H_2S content. Gypsiferous rocks don't develop in the reservoirs to the west of the trough, thus the natural gases contain little or no H_2S because of the lack of sulfur sources. The period from mid-Jurassic to Late Cretaceous is a period with the highest paleotemperature (120-180℃) for T_ 1 f in NE Sichuan Province, and also the most important period for TSR reaction. The Himalayan orogeny caused the uplift and erosion of NE Sichuan area, the reservoir temperature fell to less than 120℃ and the TSR ended. Thus, the H_ 2 S gases in T_ 1 f are conserved from mid-Jurassic to Cretaceous, their formation and distribution are closely related to the distribution of gypsiferous rocks, while irrelevant to the gas sources.
【Fund】: 中国石油天然气股份公司科技项目“中国高含硫化氢天然气田资源分布与开发战略”(0405021001);; 国家重点基础研究发展规划项目(2001CB209100)
【CateGory Index】: P618.13
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