收稿日期: 2013-06-19
修回日期: 2013-08-22
网络出版日期: 2014-04-10
基金资助
国家科技重大专项“页岩气勘探开发关键技术”（编号：2011ZH05018-002)；国土资源部“全国页岩气资源潜力调查评价及有利区优选”（编号：2009GYXQ15-09-00)；油气资源与探测国家重点实验室项目（编号：prp2009-02)联合资助.
Adsorption Capacity and Its Influence Factors of the Jurassic Shalein the Northeastern Kuqa Depression
Received date: 2013-06-19
Revised date: 2013-08-22
Online published: 2014-04-10
页岩气主要以吸附和游离状态赋存于泥页岩中，其中吸附气含量占页岩气总量的40%~85%，泥页岩的吸附能力在一定程度上决定了页岩气成藏规模的大小。为研究库车坳陷东北部侏罗系泥页岩的吸附能力和影响因素，对采集的岩心样品进行了X-射线衍射全岩矿物、微观孔隙结构和等温吸附等分析测试。结果显示：研究区侏罗系泥页岩最大吸附气量（VL)介于0.58~8.52m3/t之间，多小于2m3/t；Langmuir压力介于0.55~5.24MPa之间。分析表明：有机质是页岩气吸附的主要载体，其丰度是泥页岩吸附能力的直接控制因素；在有机质含量较低时，黏土矿物具有较强的吸附能力，是泥页岩吸附能力的主控因素。此时，微观孔隙结构对泥页岩吸附能力影响较大；不同类型的黏土矿物对吸附能力的影响不同，研究区伊/蒙混层吸附能力较强，对吸附能力影响较明显；最大吸附气量与比表面积、总孔体积具有良好的正相关关系；此外，湿度、压力等外部环境也对吸附能力有一定的影响。
任泽樱,刘洛夫，高小跃，肖飞，王英，吴康军，肖正阳 . 库车坳陷东北部侏罗系泥页岩吸附能力及影响因素分析[J]. 天然气地球科学, 2014 , 25(4) : 632 -640 . DOI: 10.11764/j.issn.1672-1926.2014.04.632
The shale gas is stored in shales mainly in adsorption and freedom states,and the former accounts for 40% to 85% of the total shale gas amount.Thus the shale adsorption capacity determines the pool scale of shale gas to some extent.In order to study the adsorption capacity and the influence factors the Jurassic shale in the northeastern Kuqa Depression,X-ray diffraction,microscopic pore structures and isothermal adsorption tests were carried out.The results indicate that the maximum amounts of adsorption (VL) range from 0.58 m3/t to 8.52m3/t,mainly lower than 2m3/t,and the Langmuir pressures are between 0.55MPa and 5.24MPa.The study shows that organic matter is the main carrier of adsorption gas and its abundance is the dominant factor influencing the adsorption capacity of the shale.When the organic matter content is low,the clay mineral is the main controlling factor for its strong adsorption capacity,and the micropore structure also significantly influences the adsorption capacity of the shale.The adsorption capacity for different types of clay minerals varies,and the illite-smectite mixed-layer has greater influence on the adsorption capacity of Jurassic shale in the northeastern Kuqa Depression for its larger adsorption property.A good positive correlation exists between the maximum amounts of adsorption gas and the specific surface area as well as total pore volume.In addition,the external conditions such as the moisture and pressure also affect the adsorption capacity to some extent.
Key words： Shale gas; Adsorption capacity; Influence factors; Jurassic shale; Kuqa Depression
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