渤海湾盆地南堡5号构造火山岩蚀变对储层物性影响及物性下限

薄片和扫描电镜资料已经证实，南堡5号构造火山岩储层存在着不同程度的蚀变.从火山岩的蚀变机理入手，研究分析了蚀变对火山岩储层物性的影响，应用经验统计法、孔隙度－渗透率交会法、压汞参数法、应力敏感法和最小含油喉道半径法确定了研究区物性下限：孔隙度为2.5%，渗透率为0.04×10^－3 μm².物性下限的确定有利于划分储层与非储层，统计储层的有效厚度，对储量的计算具有重要意义.本研究对其他地区蚀变火山岩物性下限的确定具有参照和借鉴意义.

VOLCANIC ALTERATION OF NANPU-5 STRUCTURE IN BOHAI BAY BASIN: Effects on the Physical Property of Reservoir and Lower Limits of Physical Property

Study of thin sections and scanning electron microscope(SEM) data confirms that the volcanic reservoir in Nanpu-5 structure has been altered with different degrees. Based on the alteration mechanism of volcanic rocks, the effects of volcanic alteration on physical property of reservoir are analyzed. The methods of empirical statistics, porosity-permeability intersection, mercury injection parameters, stress sensitivity and minimum oil throat radius are applied to determine the lower limits of physical property, which are defined by porosity of 2.5% and permeability of 0.04×10^-3 μm². The determination of lower limits is conducive to the division of reservoir and non-reservoir, statistics of effective thickness and calculation of reserves. The study provides reference for the determination of physical property lower limits of altered volcanic rocks in other areas.