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为了定量表征泥页岩储层吸附气的能力,选取黔南坳陷黄页1井牛蹄塘组泥页岩样品为研究对象.在泥页岩样品有机碳分析、X衍射全岩分析和等温吸附实验的基础上,建立泥页岩储层有机质、黏土矿物和其它矿物等3种组分吸附气评价模型.通过计算有机质、黏土矿物和其它矿物吸附气的能力,定量评价泥页岩储层吸附气能力.研究结果表明:黔南坳陷下寒武统牛蹄塘组下部泥页岩中有机质、黏土矿物和其它矿物吸附气能力分别为36.98m3/t,3.05m3/t和0.35m3/t,它们吸附气能力各相差10倍左右;该模型可以计算埋深相近的同一套泥页岩储层中有机质、黏土矿物和其它矿物等3种组分对页岩气的吸附能力,进而定量评价泥页岩储层吸附气能力.
In order to quantitatively characterize the adsorbed gas in shale reservoirs, the shale samples of Niutitang Formation in Well Huangqin-1, Qiannan Depression, are selected for the study.Under the shale sample organic carbon analysis, X-ray diffraction and isothermal adsorption Based on these experiments, an evaluation model of adsorption gas for three components of organic matter, clay minerals and other minerals in shale reservoir is established. By calculating the ability of organic matter, clay minerals and other minerals to adsorb gas, the adsorption of shale reservoir The results show that the adsorption capacities of organic matter, clay minerals and other minerals in shale in the lower Niutitang Formation of the Lower Cambrian in Qiannan Depression are respectively 36.98m3 / t, 3.05m3 / t and 0.35m3 / t , Which have a difference of about 10 times as much as the adsorption capacity of gas. The model can calculate the adsorption capacity of shale gas to organic matter, clay minerals and other minerals in the same set of shale reservoirs with similar burial depths, and then quantitatively evaluate Shale reservoir adsorption gas capability.