古亚洲与特提斯交汇带盆地群油气资源潜力
Potential of Oilandgas Resources of Basin Groups in Conjunction Area between the Paleoa-Asia and Tethys
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摘要: 古亚洲与特提斯构造交汇带盆地群发育石炭系、侏罗系(中下统)、白垩系(下统)等多套烃源岩,具有厚度大、分布广、有机质丰度高的特点。石炭系烃源岩有机质进入成熟—过成熟热演化阶段,侏罗系烃源岩有机质已进入大量生油阶段,白垩系烃源岩也处于生油高峰,具有良好的油气成藏的物质基础;区内储集岩发育,石炭—二叠系储集层以低孔隙度、低渗透率为特征,石炭系储集层主要为潮坪—泻湖相沉积的碎屑岩,二叠系储集层为一套河流相粗碎屑岩;侏罗—白垩系储集层物性相对较好,以中孔、中渗,或中孔、高渗为特征,为以河流—三角洲沉积砂体;在石炭—二叠系、中新生代地层中均见到了不同级别的油气显示或获工业油流。存在3种不同的生储盖组合,即1自生自储式组合。2下生上储的间隔式组合。3潜山型组合。预测油气资源量36.85亿t,目前已发现的油气储量仅为1亿t,具较大的勘探潜力。Abstract: A number of suites of Carboniferous,middle-lower Jura ssic and lower Cretaceous hydrocarbon source rocks were developed in the basin groups in the Paleo-Asian and Tethyan structural confluence area.Organic substances for the Carboniferous,Jurassic and Cretaceous source rocks have entered into the mature and over-mature phase,oil generation phase and optimum oil generation phase,respectively.So,there is a great potential to form oil and gas reservoir.Reservoir is very developed in the area,Carboniferous and Permian reservoirs have the characteristic of low permeability and low porosity,Carboniferous reservoir mainly is clastic sedimentary of tidal-flat and lagoon,Permian reservoir is a set coarse clastic rocks of fluvial facies.Jura ssic and Cretaceous reservoir physical properties are comparatively good,and they have the main characteristic of middle porosity and middle permeability,or middle porosity and high permeability,the reservoir is the sedimentary sand body of fluvial-delta facies.Different level evidences of oil and gas have been disp layed,and even the commercial oil flow has been obtained.There are three source-reservoir-cap assem blages: 1.Generation and store with in the same formation.2.segmented a ssem blage of the lower formation generation and the upper formation store.3.buried hill a ssem blage.The resource reserve of oil and gas in the area is about 36.85 hund red millionton.But,nowoil and gas found is just about 1 hundred million tons in the area,so it has great exploration potentia.
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