摘要
为了进一步认识粘土含量、地层水矿化度、微孔隙含量等因素对岩石电性的定量影响规律,基于HZ21-1-2井944B岩心粒度资料和孔隙度约束建立了三维数字岩心,利用数值模拟法研究了各因素对岩石电性的影响规律,结果表明:在相同的地层水矿化度条件下,岩石电阻率随粘土含量的增加而减小,且含水饱和度越低,粘土减阻效果越显著;对于几乎不含泥质的砂岩,地层水矿化度对岩石电阻率指数无影响;对于含泥质的砂岩,泥质呈现增阻还是减阻主要与地层水矿化度有关;微孔隙发育导致束缚水含量增加,岩石电阻率降低。这些研究成果可以为珠江口盆地(东部地区)含油饱和度评价提供指导作用。
In order to further understand quantita- tive influrences of different factors, such as clay content, formation-water salinity and microporosi- ty, on the electrical property of rocks, the data of grain size and porosity from Core 944B in Well HZ21-1-2 were used to establish a 3D digital core, and the numerical simulation was applied to ana lyze influnces of each factor. The results have indi- cated that rock resistivity will decrease with in- creasing clay content if water salinity is constant, and the lower the water saturation, the higher the degree of resistivity decrease by clay. For the sandstone containing almost no clay, water salinity may have no influrence on its resistivity; and for the sandstone containing clay, it will depend on formation-water salinity whether its resistivity may decrease or increase. Furthermore, the develop- ment of microporosity in sandstones will result in irreducible water increase and resistivity decrease. All these concepts may provide reference for the oil-saturation evaluation in Pearl River Mouth Ba- sin（the eastern area）.
出处
《中国海上油气》
CAS
北大核心
2012年第6期12-16,共5页
China Offshore Oil and Gas
基金
国家储委资源调查项目"南海东部海域储层电性参数研究(编号:Z2010SLSZ-395)"部分研究成果
