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依据全岩XRD衍射、低温氮气吸附实验获取平均孔径、比表面积、绿泥石相对含量等微观储层评价参数,对辽河大民屯凹陷页岩储层分级评价。研究表明:3个微观参数彼此之间存在明显的线性关系;平均孔径与绿泥石含量呈线性关系,绿泥石相对含量越高,平均孔径越大,其主要原因是绿泥石富集化学性质活泼的Fe元素,可吸附大量有机质,有机质在成熟演化阶段可生成大量的有机酸而形成溶蚀孔,并增加储层的平均孔径;平均孔径与比表面积之间也呈现明显的线性关系,且具有明显的三分性,当平均孔径大于10 nm时比表面积均小于1 m2/g,当平均孔径为5~10 nm时,比表面积介于1~6 m2/g,当平均孔径小于5 nm时比表面积均大于6 m2/g;比表面积和绿泥石相对含量两个微观参数之间也呈现出线性关系,且各个拐点之间的参数具有一致性,绿泥石相对含量为5%和9%时,对应的平均孔径为5和10 nm、比表面积为6~1 m2/g,可利用该拐点对页岩储层分级评价。
Based on the whole rock XRD diffraction and low temperature nitrogen adsorption experiments, the micro-reservoir evaluation parameters such as average pore diameter, specific surface area and relative content of chlorite were obtained, and the grading evaluation of shale reservoirs in Damintun depression of Liaohe River was conducted. The results show that there is a clear linear relationship among the three micro-parameters. The average pore size has a linear relationship with chlorite content. The higher the relative content of chlorite is, the larger the average pore size is. The main reason is chlorite enrichment chemistry The active Fe element can adsorb a large amount of organic matter, and the organic matter can generate a large amount of organic acid during the mature evolutionary stage to form dissolution pores and increase the average pore diameter of the reservoir. The average pore size and the specific surface area also show a clear linear relationship The average specific surface area is less than 1 m2 / g when the average pore size is greater than 10 nm. When the average pore size is 5 ~ 10 nm, the specific surface area is between 1 ~ 6 m2 / g. When the average pore size is less than 5 nm The specific surface area is greater than 6 m2 / g; the linear relationship between the specific surface area and the relative content of chlorite shows a linear relationship between the parameters of each inflection point, the relative content of chlorite is 5% and At 9%, the corresponding average pore size is 5 and 10 nm, and the specific surface area is 6 ~ 1 m2 / g. The shale reservoir can be graded using this inflection point.