Analysis on Influencing Factors of Solution-Type Secondary Pore-Evolution in Clastic Reservoirs
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摘要: 溶蚀型次生孔隙是碎屑岩储集层的一种重要孔隙类型，溶蚀型次生孔隙的形成机制是石油地质学家很感兴趣的问题之一。本文运用吐哈盆地北部坳陷与民和盆地巴州坳陷碎屑岩储集层的分析测试资料，对研究区碎屑岩储集层溶蚀型次生孔隙发育状况的主要影响因素进行了分析，阐明了原生有效碎屑岩体的形成和保存受沉积作用和成岩作用的控制，在有效碎屑岩体的成岩过程中孔隙流体性质的显著变化是大规模形成溶蚀型次生孔隙的直接原因。Abstract: The solution-type secondary pore is one of the most important types of pores in clastic reservoirs. The forming mechanism of solutio n-type secondary pores is one of the problems which petroleum geologist are very much interested in. By means of analytical test data of clastic reservoirs in Northern part depression of Tuha basin and Bazhou depression of Minhe basin, the influencing factors of solution-type secondary pore-evolution of clastic reservoirs in the researching region are analysed in this paper. Through research, the author indicates that the formation and preservation of the primary effective clastic rock bodies are controlled by sedimentation and diagenesis. The out standing change of pore fluid properties in diagenetic evolution of effective clastic rock bodies is direct cause which the solution-type secondary pores are formed on a large scale.
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