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Marine Origin Petroleum Geology >
Marine shale gas desorption types and its geological genesis in southern China
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YUE Feng, MSc, Senior Engineer, mainly engaged in geological exploration and research work. Add: No. 1689 Yanbei Rd., Chengguan District, Lanzhou, Gansu 730030, China. E-mail: lenue860612@163.com |
Received date: 2024-12-11
Revised date: 2025-02-14
Online published: 2025-05-13
Desorption characteristics reflect shale gas enrichment and its preservation conditions indirectly. Marine shale gas desorption types and their genesis in southern China have been divided and evaluated by thermal variation desorption test and gas constitution test. There are four marine shale gas desorption types. The atmospheric temperature desorption shale gas desorbed greatly under atmospheric temperature, the desorbed gas was mainly methane. Its main causes are ascribed to a good gas generation material base and preservation conditions, as well as well-developed fracture system. The reservoir temperature desorption shale gas desorbed greatly under reservoir temperature, the desorbed gas was also mainly methane. Its cause is ascribed to the absence of pressure sealing conditions formed mainly by weak caprock sealing and lateral dissipation. The high temperature desorption shale gas desorbed greatly under a high temperature above 90 ℃, the desorbed gas had relatively high O2 and N2 contents. Its causes are ascribed to shallow burial condition and destroyed preservation condition. High temperature-low content desorption shale gas desorbed a little gas under a high temperature above 90 ℃, the desorbed gas had little hydrocarbon. Its causes are ascribed to long time deep burial history and destroyed preservation condition. The atmospheric temperature desorption shale gas had better exploration and development condition, however, the reservoir temperature desorption shale gas maybe lack of economical development conditions at present. The other two types of shale gas are not worth further exploration.
YUE Feng , ZHAO Tianyu , AN Liang , LI Lunji . Marine shale gas desorption types and its geological genesis in southern China[J]. Marine Origin Petroleum Geology, 2025 , 30(2) : 110 -118 . DOI: 10.3969/j.issn.1672-9854.2025.02.002
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