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

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

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^-3μm^2.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.

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^-3μm^2.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.