徐深气田兴城开发区火山岩储层次生溶蚀孔隙研究

对徐深气田兴城开发区火山岩储层次生溶蚀孔隙进行研究，可为今后该气田的勘探开发工作提供依据。为此，根据岩心、薄片、地球化学等分析资料，对火山岩储层次生溶蚀孔隙的形成机理及分布特征进行了分析。结果发现，次生溶蚀孔隙是该类储层中最重要的储集空间类型之一，主要由晚埋藏成岩阶段有机酸性水与地层中易溶组分（长石）发生溶解作用而形成。进而认为：该区平面上爆发相较溢流相溶蚀孔隙发育，垂向爆发相自下而上表现为空落亚相溶蚀孔隙发育程度低、热激浪亚相溶蚀孔隙较发育，而热碎屑流亚相则溶蚀孔隙最为发育；溢流相溶蚀孔隙发育程度：上部亚相最好、中部亚相较差、下部亚相较好。

THE SECONDARY DISSOLUTION PORES IN VOLCANIC RESERVOIRS OF XINGCHENG DEVELOPMENT AREA IN XUSHEN GAS FIELD

A study of the secondary dissolution pores in the volcanic reservoirs of Xingcheng development area can provide a basis for future exploration and development of the Xushen gas field. The genesis and distribution of the secondary dissolution pores in the volcanic reservoirs are studied based on data of cores, thin section, chemical analysis, and etc. The results show that the secondary dissolution pore is one of the most important types of reservoir space, and is mainly formed by the dissolution of feldspar in organic acid water during the late burial diagenetic stage. Laterally, the secondary dissolution pores in the explosion facies are better developed than that in the overflow facies. Vertically, the development of dissolution pores in the explosion facies gets better progressively from the bottom to the top, while that in the overflow facies is good in the upper part, poorer in the lower part, and the poorest in the middle part.