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首页> 外文期刊>Journal of Petroleum Science & Engineering >Methane adsorption characteristics and influence factors of Mesozoic shales in the Kuqa Depression, Tarim Basin, China
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Methane adsorption characteristics and influence factors of Mesozoic shales in the Kuqa Depression, Tarim Basin, China

机译：中国塔里木盆地Kuqa Despress中甲烷吸附特征及其影响因素

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摘要

Shale gas is an important unconventional energy source that has great potential for exploration and development. The Tarim Basin is the primary gas-producing basin with abundant shale gas resource in western China. Rock pyrolysis analysis, rock quantitative analysis, helium porosity measurements, scanning electronic microscope image analysis and isothermal adsorption tests at 30 degrees C were performed on outcrop samples of continental Mesozoic shales from the Kuqa Depression to determine the methane adsorption of the shale and its influencing factors. The methane adsorption capacity varied greatly in shales of different ages. Specifically, the maximum methane adsorption capacity of the Triassic shale was 0.74-4.71 mL/g and averaged 1.56 mL/g, whereas the maximum methane adsorption capacity of Jurassic shale was 1.12-14.7 mL/g and averaged 4.82 mL/g. The carbonaceous shale had high methane adsorption capacity. The methane adsorption capacity increased with increasing total organic carbon, and the free hydrocarbon content was negatively correlated with the maximum methane adsorption capacity. There was a positive relationship between the maximum methane adsorption capacity and the organic maturity in the Jurassic shale, but no correlation was observed in the Triassic shale. This lack of correlation suggests a variation in the influence of maturity on the methane adsorption in shales of different ages. There was no relationship between the clay mineral content and the maximum methane adsorption capacity, which indicates that the clay mineral content did not affect methane adsorption. The porosity had a nonlinear negative correlation with the maximum methane adsorption capacity in the Jurassic shale. The porosity of the Jurassic shale is primarily controlled by intragranular and dissolution pores in brittle minerals, and the dissolution pores provide space for free gas but contributed less to the increase in the specific surface area.
机译：页岩气是一个重要的非传统能源，具有巨大的勘探和发展潜力。塔里木盆地是中国西部拥有丰富的页岩气资源的主要气体盆地。岩石定量分析，岩石定量分析，氦孔隙率测量，扫描电子显微镜图像分析和30摄氏度的等温吸附试验，对来自Kuqa抑郁症的欧洲中生代Hales的露头样本进行了露头，确定页岩的甲烷吸附及其影响因素。甲烷吸附容量在不同年龄的Shales中变化很大。具体地，三叠岩页岩的最大甲烷吸附能力为0.74-4.71ml / g，平均1.56ml / g，而侏罗纪页岩的最大甲烷吸附能力为1.12-14.7ml / g，平均为4.82ml / g。碳质页岩具有高甲烷吸附能力。随着总有机碳的增加而增加，甲烷吸附能力增加，并且自由的烃含量与最大甲烷吸附能力负相关。在侏罗纪页岩的最大甲烷吸附能力和有机成熟之间存在正相关关系，但在三叠纪的页岩中没有观察到相关性。这种缺乏相关性表明成熟度对不同年龄的甲烷吸附的影响的变化。粘土矿物质含量与最大甲烷吸附能力之间没有关系，这表明粘土矿物质含量不影响甲烷吸附。孔隙率与侏罗纪页岩中的最大甲烷吸附容量具有非线性负相关性。侏罗纪页岩的孔隙率主要通过脆性矿物质的腔内和溶解孔来控制，并且溶解孔为空气提供空间，但对比表面积的增加导致较低。

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