Characteristics of Penecontemporaneous Karstification in Ordovician Majiagou Formation, Sulige Gas Field, Ordos Basin
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摘要: 苏里格气田是鄂尔多斯盆地主要的采气区,奥陶系马家沟组碳酸盐岩是区内重要的目的层段之一。其中,准同生期岩溶作用对马家沟组储集层的发育具有明显的建设性作用,是研究区下古生界储集性能最重要的贡献者。笔者充分利用区内丰富的取心资料和配套分析资料,分析了研究区内广为分布的高频暴露特征及(准)同生期岩溶,识别总结出6种(准)同生期岩溶的典型证据;结合研究区地质背景,提出(准)同生期岩溶改造过程和发育模式;并进一步分析(准)同生期岩溶发育受到内部和外部2种因素影响,不仅加强了对研究区岩溶类型的了解及识别特征,同时也丰富了古岩溶理论。Abstract: Sulige gas field is the major gas-production area in Ordos basin.The carbonate of the Ordovician Majiagou formation is one of the most important target-strata for gas exploration. The karstification in the penecontemporaneous period has a significant constructive effect on the reservoir development of Majiagou formation,which is the most important contributor to the reservoir performance of the Lower Paleozoic in the study area.Based on the data of rock core and analysis data,this paper analyzes the high-frequency exposure characteristics and penecontemporaneous karstification in the study area,identified and summariedsix typical evidence of penecontemporaneous karstification.Combined with the geological background of the study area, the paper puts forward the process and development model of penecontemporaneous karst transformation, and further analyses that penecontemporaneous karst development is influenced by internal and external factors.It not only strengthens the understanding and recognition of karst types, but also enriches the paleokarst theory.
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Key words:
- Sulige gas field /
- carbonate rock /
- penecontemporaneous /
- karst feature
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