六盘水煤田上二叠统煤系气成藏特征及共探共采方向
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摘要
六盘水煤田上二叠统含煤地层中煤层、页岩、砂岩叠置频繁,统筹勘探不同储层中的天然气有助于减少资源浪费,提高开发效益。通过对煤系气储层岩相、厚度、源岩地化、储层物性及空间赋存规律的研究,分析了六盘水煤田煤层气、煤系页岩气和煤系致密气成藏潜力,讨论了煤系气的空间叠置关系和勘探前景。结果显示:区内晚二叠世煤层煤种齐全,厚度较大,变质程度普遍偏高,含气显示优越;页岩和砂岩累计厚度大,有机地球化学和储集物性参数良好;不同岩性的区域和层位分布差异较大,组合类型多样,空间配置关系有利于发育垂向多套天然气藏。煤系页岩气最有利勘探层位为龙潭组下段,煤层气和煤系致密气最有利层位为汪家寨组和龙潭组上段;以此为基础,总结提炼出"源储一体型"独立煤系页岩气藏、"源储紧邻型"煤系"三气"组合气藏、"下生上储型"煤系"两气"组合气藏共3种气藏类型。初步认为晴隆向斜深部为煤系页岩气优先勘探区,青山向斜深部适合煤层气和煤系页岩气共探共采,盘关向斜和格目底向斜深部适合煤层气和煤系致密砂岩气共探共采。
In the Upper Permian coal bearing strata of Liupanshui Coalfield,there were coal seam,shale and sandstone overlaid frequently.In order to have an overall plan and exploration on the natural gas in different reservoir and to favorably reduce the resources wasted and improve the development benefit,with the study on the lithofacies,thickness and source rock geochemistry of the coal measure gas reservoir,the reservoir physical property and the spatial occurrence law,this paper analyzed the reservoir formation potential of the coalbed methane,coal measure shale gas and the coal measure tight gas in Liupanshui Coalfield and discussed the space overlaid relationship and exploration prospects of the coal measure gas.The study results showed that within the coalfield,the coal rank of late Permian coal seam was complete,the thickness was high,the metamorphic grade was generally higher,and the gas content was good.The gross thicknesses of the shale and the sandstone were high,the organic geochemistry and reservoir physical parameters were good.The difference was high in regional and horizon distribution of different lithology,the lithological combinationtypes varied,and the space disposition was beneficial to the development of many vertical natural gas reservoirs.The favorable exploration horizon of the coal measure shale gas was the lower section of the Longtan Formation and the favorable horizon of the coalbed methane and the coal measure tight gas was the Wangjiazhai Formation and the up section of Longtan Formation.Based on the circumstances,totally three major gas reservoir types,including the "resources and storage integration"independent coal measure shale gas reservoir,"resources and storage closed neighbor type"coal measure "three gas combined gas reservoirs"and "bottom resources and top storage type"coal measure "two gases combined gas reservoirs"were summarized and provided. The paper preliminarily concluded that Qinglong Syncline deep section would be the priority exploration zone of the coal measure shale gas,Qingshan Syncline deep section would be favorable to the co-exploration and co-mining of the coalbed methane and the coal measure shale gas,Panguan Syncline and Gemudi Syncline deep section would be favorable to the co-exploration and co-mining of the coalbed methane and the coal measure tight sandstone gas.
In the Upper Permian coal bearing strata of Liupanshui Coalfield,there were coal seam,shale and sandstone overlaid frequently.In order to have an overall plan and exploration on the natural gas in different reservoir and to favorably reduce the resources wasted and improve the development benefit,with the study on the lithofacies,thickness and source rock geochemistry of the coal measure gas reservoir,the reservoir physical property and the spatial occurrence law,this paper analyzed the reservoir formation potential of the coalbed methane,coal measure shale gas and the coal measure tight gas in Liupanshui Coalfield and discussed the space overlaid relationship and exploration prospects of the coal measure gas.The study results showed that within the coalfield,the coal rank of late Permian coal seam was complete,the thickness was high,the metamorphic grade was generally higher,and the gas content was good.The gross thicknesses of the shale and the sandstone were high,the organic geochemistry and reservoir physical parameters were good.The difference was high in regional and horizon distribution of different lithology,the lithological combinationtypes varied,and the space disposition was beneficial to the development of many vertical natural gas reservoirs.The favorable exploration horizon of the coal measure shale gas was the lower section of the Longtan Formation and the favorable horizon of the coalbed methane and the coal measure tight gas was the Wangjiazhai Formation and the up section of Longtan Formation.Based on the circumstances,totally three major gas reservoir types,including the "resources and storage integration"independent coal measure shale gas reservoir,"resources and storage closed neighbor type"coal measure "three gas combined gas reservoirs"and "bottom resources and top storage type"coal measure "two gases combined gas reservoirs"were summarized and provided. The paper preliminarily concluded that Qinglong Syncline deep section would be the priority exploration zone of the coal measure shale gas,Qingshan Syncline deep section would be favorable to the co-exploration and co-mining of the coalbed methane and the coal measure shale gas,Panguan Syncline and Gemudi Syncline deep section would be favorable to the co-exploration and co-mining of the coalbed methane and the coal measure tight sandstone gas.
引文
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