Gas source analysis of natural gas hydrate of Muri coalfield in Qilian Mountain permafrost, Qinghai Province, China
Abstract：By using organic geochemistry and organic petrology methods comprehensively,the contrastive study of gas measured data of coal bed methane and gas hydrate samples from Muri coalfield in Qilian Mountain permafrost area was carried out, the comparability and similarity of the both were revealed. Based on the hydrocarbon source rock eval- uation and geological conditions analysis, the hydrocarbon gas sources of natural gas hydrate was discussed, which was considered that the gas hydrate in Muri coalfield belongs to the mixed gas genesis with dominant coal-typed gas, Juras- sic coal seam, carbon mudstone and oil shale are major gas source rocks, and the Carboniferous dark marlite, the Lower Permian dark limestone and the Upper Triassic dark mudstone are minor gas source rocks. Gas hydrate prospecting tar- get in Qinghai-Tibetan Plateau permafrost should concentrate on the middle metamorphic phase （condensate-wet gas zone） of coal distribution area, the western part of Muri coalfield, Wuli coal-bearing region in the southern Qinghai and Tureen coal-bearing region in the northern Tibetan are the optimum target areas.
Keywords：natural gas hydrategas source analysisMuri coalfieldcoal-typed gas
Publication Date：2012-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 1364-1368 )