1. Gas invasion is the key process of Sinian-Cambrian gas accumulation in Sichuan Basin.
- Author
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Liu, Huan, Wang, Tingdong, Li, Yanjun, and Deng, Feiyong
- Subjects
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GAS reservoirs , *BITUMEN geology , *ASPHALTENE , *LIQUID hydrocarbons , *PYROLYSIS - Abstract
Previous studies divided the Sinian-Cambrian gas accumulation processes into three stages, including (1) paleo-oil accumulation; (2) paleo-oil cracking; and (3) gas reservoir adjustment and finalization. The author thinks that they ignored a key process, during which the natural gas invades and changes the paleo-oil reservoirs into paleo-gas reservoirs. According to the micro-observation of bitumen in reservoirs, there were great differences between the asphaltene formed by gas invasion and the pyrobitumen formed by paleo-oil cracking. When the gas invasion happened in paleo-reservoirs, asphaltene was separated out and the liquid hydrocarbon was partially changed into solid bitumen which lead to the increase of gas storage for oil-cracking gas and source rocks pyrolysis gas. [ABSTRACT FROM AUTHOR]
- Published
- 2018
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