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砂泥岩主要由不同粒径的氧化硅、粘土矿物、胶结构及少量的杂质矿物组成。可以利用氧化铝、氧化钾含量联立确定粘土矿物种类,用基岩氧化铝的含量指示粘土矿物的含量。 在砂泥岩地层的石油测井中,力求得到正确的含油饱和度、含水饱和度,最大的困难是泥质的影响。在测井中泥质通常是指粒径小于4μm的微粒,因为小于4μm粒径的砂粒或粘粒不可能形成供流体流动的孔隙,这对油气开采方面意义很大。但是,用泥质来研究沉积岩的电学性质、声学性质及放射性特性存在一定
Sandstone and mudstone are mainly composed of silica, clay minerals, gel structures and a few impurities minerals with different particle sizes. Clay mineral species can be determined by simultaneous determination of alumina and potassium oxide content and clay mineral content by the bedrock alumina content. In the sandstone and mudstone oil logging, trying to get the correct oil saturation, water saturation, the biggest difficulty is the impact of muddy. Shale generally refers to particles with a particle size of less than 4 μm in logs because sand or clay particles smaller than 4 μm in diameter can not form pores for fluid flow, which is of great significance for hydrocarbon recovery. However, using shale to study the electrical, acoustic and radioactive properties of sedimentary rocks