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为进一步认清三塘湖盆地石炭系火山岩成岩作用及储层形成机理,明确次生孔隙形成及演化规律,通过岩心观察、薄片鉴定和电镜资料的研究分析,从蛇绿岩套、典型碱交代矿物、特殊元素的富集、碳硅泥岩系4个方面证实了火山岩碱性成岩作用的存在.碱性成岩作用的提出可以解决“上硅下碱”的垂向交代序列,岩石红化、碎裂,隐爆角砾岩的发育,风化壳型储层差异性,交代蚀变矿物的异常叠加方式,长石充填孔缝,圈闭有效性及储层范围预测,火山岩储层形成机理等8个方面问题.
In order to further understand the diagenesis and reservoir formation mechanism of Carboniferous volcanic rocks in Santanghu Basin, the formation and evolution of secondary pores were clarified. Based on the core observation, thin section identification and electron microscopy data analysis, Mineralization and special elements enrichment, carbon-silicon mudstone department confirmed the existence of alkaline diagenesis of volcanic rock.The proposal of alkaline diagenesis can solve the vertical replacement sequence of “alkali-on-silicon”, rock redification , Fragmentation, the development of cryptoexplosive breccias, the differences of weathering crust reservoirs, the anomalous superimposition of alteration minerals, the pore filling of feldspar, the validity of traps and the prediction of reservoir range, the formation mechanism of volcanic reservoirs And other eight aspects of the problem.