CALCULATION OF COAL BED GAS DESORPTION TIME AND ANALYSIS OF ITS INFLUENTIAL FACTORS
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摘要: 西藏地区广泛分布的二叠系地层属冈瓦纳大陆北缘较稳定的浅海碳酸盐台地相沉积,包括了开阔台地、半局限台地、颗粒浅滩、介壳浅滩、生物礁、近岸潮下带等相类型。开阔台地、半局限台地相常发育烃源岩,地表样品有机质处于高成熟-过成熟阶段;属于礁滩相的储集层并不很发育,多属Ⅳ类储层,裂隙是该套地层中油气最可能的储集空间。二叠系地层中盖层亦不发育,在中上侏罗统和下白垩统泥页岩的覆盖下和其它有利条件的配合下,有可能形成一些中小型的、与不整合面有关的油气藏。Abstract: The widely distributed Permian strata belong to stable carbonate platform facies near the north edge of the Gondwana Land,in which includes several subfacies,i.e.open platform,half restricted platform,grain bank,shelly bank and reef.Hydrocarbon source rocks were developed in open platform and half restricted platform facies with organic matters in high mature phase or post-mature phase.Reserviors,mostly in reef and banks,were not developed very well and fracture was the most possibel space for hydrocarbon storage.The cap rocks were also not developed efficiently.Some middle and small reservoirs related to unconformity may be formed under covering of the Middle and Upper Jurassic and Lower Cretaceous shales.
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Key words:
- Permian /
- sedimentary characteristics /
- petroleum geology /
- Tibet
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[1] 西藏地矿局. 西藏自治区区域地质志[M].北京:地质出版社,1993． [2] 吴一民,傅在斌.西藏改则县夏岗江石炭、二叠纪冈瓦纳相地层[J].地层学杂志,1986,10(4):286-288． [3] 夏代祥. 藏北湖区申扎一带的古生代地层[A].青藏高原地质文集(二)[C].北京:地质出版社,1983.116-117. [4] 徐宪,魏振声,陈国恩,焦生瑞. 青藏高原区域地层简表[M]. 北京:地质出版社,1982．127-128． [5] 西藏自治区地质矿产局. 西藏自治区岩石地层[M].武汉:中国地质大学出版社,1997．139-140． [6] 徐伟民.石油地球化学在油气勘探中的应用[M].东营:石油大学出版社,1993．7-11,45-53． -
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