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测井解释是油气层识别最常用方法,它是依据储层流体物理性质差异解释油气水层。由于测井解释采储层岩石成分,地层水矿化度及泥浆侵入等多种因素的影响。因此在解释一些低阻油气层及气层和凝析气层时常常出现偏差,油气水界面也难以确定,地球化学方法主要是根据储层残留烃的化学性质识别油,气水层,它不受储层岩石成分及储层流体物理性质等因素的影响。只与储层流体的化学性质有关,可弥补测井解释方法的不足,为油气水层的识别提供一种新方法,文章详细研究油层,凝析气层及水层的地球化学特征,结果表明,油层,气层和水层的抽提物含量,荧光强度与荧光分布以及储层烃的碳数分布完全不同,可用来识别油气水层。

Geochemical Methods of Identifying Oil Reservoir, Gas Reservoir and Water Layer

Log interpretation is the most common method of identifying oil reservoir, gas reservoir and water lay er, its basis being the differences among the physical properties of reservoir fluids. Because of the influence of several factors, as reservoir rock composition, formation water salinity and mud in vasion depth,etc. ,upon log interpretation,the deviation is often found in interpreting low resistivity oil reservoir, gas reservoir and gas condensate reservoir and it is difficult to determine the interfaces between oil, gas and water. Geochemical method is mainly based on the chemical property of reservoir extracted hydrocarbons to identify oil reservoir, gas reservoir and water lay er. It isn't influenced by the factors,as reservoir rock composition and the physical properties of reservoir fluids, etc. , and is only related to the chemical properties of reservoir fluids, which may remedy the weaknesses of log interpretation method and provides a new method for identifying oil reservoir, gas reservoir and water layer. Through analyzing the geochemical characteris tics of oil reservoir, gas condensate reservoir and water layer in detail, it is shown that the extract content, fluorescence strength and distribution as well as the distribution of number of carbons in reservoir hydrocarbons of the oil reservoir, gas reservoir and water layer are fully different from each other, which may be used for identifying hydrocarbon reservoirs and water layers.