Evaluation Model of Shale Adsorbed Gas Considering Clay and Water Saturation

IF 1.1 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Interpretation-A Journal of Subsurface Characterization Pub Date : 2023-01-10 DOI:10.1190/int-2022-0066.1
Kun Liu, Jing Lu, Song Hu, Z. Nan
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Abstract

Shale adsorption capacity is affected by many factors including temperature, pressure, geochemical characteristics of organic matter, clay, and water saturation. The traditional calculation model of adsorbed gas content only considers the influence of temperature, pressure, and organic geochemical characteristics. The influence of clay and water saturation on adsorption capacity is seldom considered. Isotherm adsorption experiments were conducted on synthetic specimens and natural specimens with varying clay types, clay contents, and water saturations. Then, the influences of clay and water saturation on the adsorption capacity were systematically studied. The experimental results found that the order of clay adsorption capacities was smectite > kaolinite > chlorite > illite. The multicomponent superposition rule was applicable in evaluating shale-adsorbed gas content. The total adsorption capacity was equal to the accumulation of the adsorption capacities of all types of clay and organic matter. Moisture will significantly reduce the adsorption capacity of shale. The adsorption capacities of synthetic specimens and natural specimens after being fully saturated with water were 9%–14% and 42%–61% of those in dry states, respectively. Then, a new shale-adsorbed gas evaluation model was established based on the Langmuir equation considering clay and water saturation. The calculation error of this new model was approximately 11%, which provides a new method for evaluating the adsorbed gas content of shale.
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考虑粘土和含水饱和度的页岩吸附气评价模型
页岩的吸附能力受温度、压力、有机质地球化学特征、粘土和含水饱和度等因素的影响。传统的吸附气体含量计算模型只考虑温度、压力和有机地球化学特征的影响。很少考虑粘土和水饱和度对吸附容量的影响。在不同粘土类型、粘土含量和含水饱和度的合成试样和天然试样上进行了等温吸附实验。然后,系统地研究了粘土和含水饱和度对吸附容量的影响。实验结果表明,粘土吸附能力的大小顺序为蒙脱石>高岭石>绿泥石>伊利石。多组分叠加规则适用于评价页岩吸附气含量。总吸附容量等于所有类型的粘土和有机物的吸附容量的累积。湿气会显著降低页岩的吸附能力。合成试样和天然试样在完全饱和后的吸附能力分别为干燥状态下的9%–14%和42%–61%。然后,基于考虑粘土和水饱和度的Langmuir方程,建立了一个新的页岩吸附气评价模型。该模型的计算误差约为11%,为评价页岩吸附气含量提供了一种新的方法。
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来源期刊
CiteScore
2.50
自引率
8.30%
发文量
126
期刊介绍: ***Jointly published by the American Association of Petroleum Geologists (AAPG) and the Society of Exploration Geophysicists (SEG)*** Interpretation is a new, peer-reviewed journal for advancing the practice of subsurface interpretation.
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