利用微观孔隙结构参数对辽河大民屯凹陷页岩储层分级评价

发布时间：2018-06-18 20:39

本文选题：页岩储层 + 微观结构　；参考：《中国石油大学学报(自然科学版)》2016年04期

【摘要】：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。
[Abstract]:According to the XRD diffraction of whole rock and nitrogen adsorption experiment at low temperature, the microcosmic reservoir evaluation parameters, such as average pore size, specific surface area and relative content of chlorite, were obtained, and the shale reservoirs in the Damingtun sag of Liaohe River were classified and evaluated. The results show that there is an obvious linear relationship between the three microcosmic parameters, the average pore size is linear with the chlorite content, the higher the relative content of chlorite is, the larger the average pore size is. The main reason is that chlorite is rich in active Fe elements and can adsorb a large amount of organic matter. Organic matter can form a large amount of organic acids in the maturing stage and form dissolution pores and increase the average pore size of reservoir. There is also a linear relationship between the average pore size and the specific surface area, and there is an obvious trichotomy. When the average pore size is greater than 10 nm, the specific surface area is less than 1 m2 / g, and when the average pore size is 5 ~ 10 nm, the specific surface area is less than 1 m ~ 2 / g. The specific surface area is between 1 and 6 m2 / g, and when the average pore size is less than 5 nm, the specific surface area is greater than 6 m2 / g, and there is a linear relationship between the specific surface area and the relative content of chlorite, and the parameters of each inflection point are consistent. When the relative content of chlorite is 5% and 9%, the corresponding average pore size is 5 and 10 nm, and the specific surface area is 6 ~ 1 m ~ 2 / g. This inflection point can be used to evaluate shale reservoir classification.
【作者单位】：中国石油大学非常规油气与新能源研究院;辽河油田有限责任公司勘探开发研究院;东北石油大学地球科学学院;
【基金】：国家自然科学基金项目(41302103,41330313,41472105,U1262106,41572135) 中国石油科技创新基金项目(2014D-5006-0107) 中央高校基本科研业务费专项(15CX05008A)
【分类号】：P618.13

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