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当前位置: 首页 > 文章 > 松辽盆地古龙页岩孔隙结构及分形特征 长江大学学报(自科版)农学卷 2024 (3) 10-19
Position: Home > Articles > Pore structure and fractal characteristics of Qingshankou formation shale in Gulong depression, Songliao basin Journal of Yangtze University(Natural Science Edition)Agricultural Science Volumn 2024 (3) 10-19

松辽盆地古龙页岩孔隙结构及分形特征

作  者：
王青振
单  位：
中国石油大庆油田有限责任公司勘探开发研究院;黑龙江省油层物理与渗流力学重点实验室;多资源协同陆相页岩油绿色开采全国重点实验室
关键词：
松辽盆地;青山口组;页岩;孔隙结构;氮气吸附;分形特征
摘  要：
松辽盆地古龙凹陷青山口组页岩为陆相纯页岩型储层，具有有机质丰度高、成熟度高、黏土矿物含量高等特征。为揭示研究区页岩的孔隙结构特征及非均质性，运用扫描电镜、XRD(全岩矿物分析)、氮气吸附等技术方法，分析了研究区页岩微纳米孔隙及裂缝储集空间类型和孔隙结构，对页理缝进行了分类，并通过FHH模型对研究区页岩储层的分形特征进行研究。结果表明：古龙页岩矿物组成以黏土矿物、石英、长石为主。页理缝主要分为长条状贯穿缝、短簇状尖灭缝、分叉状穿层缝和有机质充填缝，以短簇状尖灭缝为主。古龙页岩具有典型的分形特征，大孔隙的分形维数为2.528～2.555,中小孔的分形维数为2.791～2.829。古龙页岩中2～50 nm的介孔是主要储集空间，平均孔隙体积占比79.85%,有机碳含量与比表面积、孔隙体积、分形维数具有正相关性，平均孔径与分形维数具有负相关性，有机碳与黏土矿物含量是影响分形结构特征的主要控制因素。页岩孔隙结构及分形特征的研究对于页岩含油气性和开发储量的评价有重要意义。
译  名：
Pore structure and fractal characteristics of Qingshankou formation shale in Gulong depression, Songliao basin
作  者：
WANG Qingzhen;Exploration and Development Research Institute of Daqing Oilfield Co Ltd;National Key Laboratory of Continental Shale Oil;Heilongjiang Key Laboratory of Reservoir Physics and Fluid Mechanics in Porous Medium;
关键词：
Songliao basin;;Qingshankou formation;;shale;;pore structure;;nitrogen adsorption;;fractal features
摘  要：
The Qingshankou formation shale in the Gulong depression of the Songliao basin is a terrestrial pure shale-type reservoir characterized by high total organic matter, high maturity, and high clay content.In order to reveal the pore structure characteristics and heterogeneity of shale in the study area, this work employs techniques including field emission scanning electron microscopy, XRD(rock mineral analysis), nitrogen adsorption, etc., to analyze the types of reservoir space, which insisting of micropore, nanopore, and fractures, as well as the pore structure characteristics in the study area.This work categorizes fractures of the lamellation by the property of origin, and studies the fractal characteristics of the study area by adopting the FHH model.The results show that the primary composition of clay minerals are quartz, feldspar, and clay minerals, which content beyond 35% of the Gulong shale.The lamellate fractures can be divided into long-strip like penetrating fractures, short cluster-like pointed out fractures, forked layered fractures, and organic matter-filled fractures, with short cluster-like pointed out fractures being the major type.The Gulong shale has typical fractal characteristics, with the fractal dimensions of large pores ranging from 2.528 to 2.555, small and medium-sized pores ranging from 2.791 to 2.829.The main reservoir space in the Gulong shale is the 2～50 nm mesopores, with an average pore volume accounting for 79.85%.Organic carbon content positively correlates with specific surface area, pore volume, and fractal dimension, while the average pore diameter negatively correlates with fractal dimension.The range of organic matter and clay is the dominant factor influencing the fractal structure characteristics.The study of shale pore structure and fractal characteristics is significant for evaluating shale oil and gas potential and development reserves.

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