| Author's Name: NIE Zhou, HENG De, ZOU Yuanhong, XIAO Hongsha, CHEN Yicai, KANG Yu, PENG Wenqiu |
| Institution: |
| Abstract: |
| Adsorbed gas is an important occurrence form and component of shale gas. In order to clarify the evolution law of adsorbed gas content in shale burial process in Changning area of Sichuan Basin, using data of shale isotherm adsorption experiment, drilling site desorption, and logging comprehensive interpretation, a multiple regression equation of adsorbed gas content with main influencing parameters such as formation temperature, formation pressure and TOC is setup. On this basis, combined with the recovery of the burial history and thermal history of typical evaluation Well N201, the shale adsorbed gas content in different geological periods is quantitatively calculated. The calculation results show that shale organic matter began to generate large amounts of gas in Jurassic, the shale-adsorbed gas content gradually increased with the increase of burial depth, and reached 4.42 m3/t at the end of Late Cretaceous. Since Paleogene, with the overlying strata being largely denuded, the shale adsorbed gas content gradually decreased to 1.67 m3/t at present. |
| Keywords: Adsorbed gas is an important occurrence form and component of shale gas. In order to clarify the evolution law of adsorbed gas content in shale burial process in Changning area of Sichuan Basin, using data of shale isotherm adsorption experiment, drilling site desorption, and logging comprehensive interpretation, a multiple regression equation of adsorbed gas content with main influencing parameters such as formation temperature, formation pressure and TOC is setup. On this basis, combined with the recovery of the burial history and thermal history of typical evaluation Well N201, the shale adsorbed gas content in different geological periods is quantitatively calculated. The calculation results show that shale organic matter began to generate large amounts of gas in Jurassic, the shale-adsorbed gas content gradually increased with the increase of burial depth, and reached 4.42 m3/t at the end of Late Cretaceous. Since Paleogene, with the overlying strata being largely denuded, the shale adsorbed gas content gradually decreased to 1.67 m3/t at present.
Key words： adsorbed gas content; shale; isothermal adsorption experiment; thermal evolution history; Wufeng Formation; Longmaxi Formation; Changning area |
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投稿时间：
2021-03-31 |
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