柴达木盆地北缘中侏罗统泥页岩吸附特征及影响因素分析  

Analysis of Middle Jurassic Argillutite Adsorptive Features and Impacting Factors at North Margin of Qaidam Basin

作　　者：裴明明 邵龙义[1] 李永红 文怀军 张文龙 

机构地区：[1]中国矿业大学(北京)地球科学与测绘工程学院,北京100083 [2]青海煤炭地质105勘探队,西宁810007 [3]青海煤炭地质局,西宁810007

出　　处：《中国煤炭地质》2016年第10期19-23,共5页Coal Geology of China

基　　金：中国地质调查局项目(121201114019501)资助

摘　　要：柴达木盆地北缘中侏罗统具有较好的页岩气勘探前景,深入研究该地区暗色泥页岩吸附特征及影响因素对分析区内页岩气聚集规律有一定参考意义。以柴达木盆地北缘鱼卡地区为例,对中侏罗统泥页岩岩心样品进行X射线衍射全岩矿物组成及黏土矿物相对含量、总有机碳（TOC）含量和等温吸附等分析测试。结果表明：区内泥页岩TOC含量4.76%-25.30%,平均含量为12.05%;矿物组成以黏土矿物和石英为主,黏土矿物又以伊/蒙间层矿物和高岭石为主;泥页岩最大吸附量（VL）为1.19-8.46 cm3/g,平均值3.88 cm3/g;兰氏压力（PL）为1.72-4.98 MPa,平均3.13 MPa;泥页岩的总有机碳含量与吸附能力之间存在一定的正相关关系;黏土矿物总量与吸附能力之间具有明显的正相关性,不同类型的黏土矿物对吸附能力具有不同的影响,黏土矿物中以伊/蒙间层矿物＋高岭石总量对吸附能力的影响较为显著。The middle Jurassic strata at the north margin of Qaidam Basin have better shale gas exploration prospect. Detailed study on dark argillutite adsorptive features and impacting factors has certain reference significance to analyze shale gas accumulation pattern in the area. Taking the Iqe area as an example, carried out core samples X-ray diffraction mineral composition, clay minerals relative content, TOC and isothermal adsorption analytical tests. The result has shown that the TOC of argillutite in the area is 4.76%-25.30%, average 12.05%; mineral composition is mainly quartz, and the clay minerals have mainly interstratified illite/montmorillonite and kaolinite; argillutite maximum adsorbance （VL） is between 1.19-8.46 cm3/g, average 3.88 cm3/g; Langmuir pressure （PL） is between 1.72-4.98 MPa, average 3.13 MPa. Between TOC of argillutite and adsorptivity has certain positive correlation; between total clay minerals and adsorptivity has obvious positive correlation. Different clay mineral types have different impacts on adsorptivity, among them the total interstratified illite/montmorillonite plus kaolinite have more significant impact on adsorptivity.

关 键 词：中侏罗统 泥页岩 吸附能力 有机碳含量 矿物组成 影响因素 

分 类 号：TE122.2[石油与天然气工程—油气勘探]