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低电阻率油层根据其成因影响因素可划分5种类型:岩石骨架导电型、高束缚水饱和度型、高矿化度地层水型、双孔隙度结构与裂缝并存型、咸水泥浆侵入型。导致油层电阻率降低的主要内在因素包括:储层岩石骨架中含有导电物质如含黄铁矿等金属矿物时,是导致低电阻油层形成原因之一;岩石中黏土矿物阳离子交换性与平衡阳离子的附加导电作用可以造成油层电阻率的明显降低,形成低电阻率油层;岩性细、泥质含量高、储层孔隙结构复杂化,孔隙吼道变小,微孔隙增多为束缚水提供了储存空间,形成高束缚水饱和度储层,导电能力增强,使油层电阻率变低。咸水泥浆侵入是油层电阻率变低的外在因素。
Low resistivity reservoirs can be divided into five types according to their genetic factors: rock skeleton conductivity type, high irreducible water saturation type, high salinity formation water type, dual porosity structure and fracture coexistence, and saltwater mud intrusive type. The main internal factors which lead to the decrease of oil resistivity are: the formation of low resistivity oil layer is one of the reasons for the formation of low resistivity oil layer when the conductive rock in the reservoir rock is composed of conductive minerals such as pyrite, etc .; the cation exchangeability and equilibrium cation Additional electrical conductivity can cause oil layer resistivity decreased significantly, the formation of low resistivity oil layer; fine lithology, high clay content, reservoir pore structure is complicated, pore sighs become smaller, increased micro-pore water bound water provides storage space , The formation of high irreducible water saturation reservoir conductivity enhancement, the reservoir resistivity lower. Saltwater mud invasion is an external factor that causes the resistivity of the reservoir to become lower.