浅层页岩气储层孔隙分形特征及控制因素——以云南昭通地区龙马溪组为例

doi:10.13278/j.cnki.jjuese.20220148

吉林大学学报(地球科学版) ›› 2022, Vol. 52 ›› Issue (6): 1813-1829.doi: 10.13278/j.cnki.jjuese.20220148

浅层页岩气储层孔隙分形特征及控制因素——以云南昭通地区龙马溪组为例

赵越1,2,3, 李磊1, 司运航1, 王会敏1

1.辽宁工程技术大学矿业学院，辽宁阜新123000
2.辽宁工程技术大学阜新转型创新发展研究院，辽宁阜新123000
3.辽宁省资源型城市可持续发展研究基地，辽宁阜新123000

收稿日期:2022-05-16 出版日期:2022-11-26 发布日期:2022-12-27
基金资助:
中国科协2022年度科技智库青年人才计划项目（20220615ZZ07110207）；辽宁省教育厅青年科技人才“育苗”项目（LJ2020QNL003）

Fractal Characteristics and Controlling Factors of Pores in Shallow Shale Gas Reservoirs: A Case Study of Longmaxi Formation in Zhaotong Area, Yunnan Province

Zhao Yue1,2,3, Li lei1, Si Yunhang1, Wang Huimin1

1. Mining Institute, Liaoning Technical University, Fuxin 123000, Liaoning, China
2. Institute of Innovation and Development for Fuxin Transition, Liaoning Technical University, Fuxin 123000, Liaoning, China
3. Liaoning Province Resource-Based City Sustainable Development Research Base, Fuxin 123000, Liaoning, China

Received:2022-05-16 Online:2022-11-26 Published:2022-12-27
Supported by:
the 2022 Science and Technology Think Tank Youth Talent Program China Association for Science and Technology (20220615ZZ07110207) and the “Nurturing Seedlings” Project of Young Science and Technology Talents of the Department of Education of Liaoning Province （LJ2020QNL003）

摘要/Abstract

摘要： 为定量表征云南昭通国家级页岩气示范区龙马溪组页岩孔隙结构复杂程度及对页岩气影响，通过对24块龙马溪组页岩进行TOC质量分数、全岩矿物组分、低温氮气吸附测试，从页岩孔隙结构及矿物组分两个方面分析讨论二者对页岩孔隙分形维数的影响。结果显示：昭通地区龙马溪一段不同小层之间孔隙发育，非均质性强，有机质质量分数在1小层最高，纵向上具有降低—升高—降低的“三段式”变化，页岩孔隙分形维数具有分段特点，其中分形维数D2介于2.699 4~2.912 4之间，平均为2.826 5，分形维数D1介于2.617 4~2.719 4之间，平均为2.673 4，孔隙结构复杂，分形维数在1小层最高，向上逐渐减小。页岩分形维数与孔隙结构参数及地质因素相关性分形显示：TOC质量分数及石英体积分数控制微孔的发育，提供主要的比表面积，与分形维数具有良好正相关关系，有利于页岩气的赋存，总含气量及吸附气比例高；黏土矿物及白云石体积分数主要控制介孔及宏孔的发育，提供主要的孔体积，与分形维数呈负相关。结合生烃、储集及开发因素可知，1小层及3小层因其TOC质量分数高、分形维数大、脆性强的特点，有利于页岩气滞留，成为页岩气开发的有利层位。

关键词: 龙马溪组, 储层, 孔隙结构, 分形维数, 控制因素, 浅层页岩气, 昭通地区

Abstract: In order to quantitatively characterize the complexity of shale pore structures of Longmaxi Formation in Zhaotong national shale gas demonstration zone, Yunnan Province and its influence on shale gas, 24 pieces of shales collected from Longmaxi Formation were tested for TOC mass fraction, whole rock mineral composition and low-temperature nitrogen adsorption. And their influence on fractal dimension of shale pores was analyzed and discussed from two aspects of shale pore structures and mineral composition. The results show that there is a strong heterogeneity in pore development among different sub-layers in Member 1 of Longmaxi Formation in Zhaotong area, with the highest content of organic matter in the Layer 1, with a “three-stage” variation of decreasing-increasing-decreasing in the longitudinal direction. Shale pores are segmented, with fractal dimension D2 ranging from 2.699 4 to 2.912 4, with an average of 2.826 5 and fractal dimension D1 ranging from 2.617 4 to 2.719 4. The pore structures are complex and the fractal dimension is highest in the Layer 1 and gradually decreases upwards. The correlation between fractal dimension of shale with pore structure parameters and geological factors shows that TOC mass fraction and quartz volume fraction control the development of micropores, provide the main specific surface area, and have a good positive correlation with fractal dimension, which is conducive to the occurrence of shale gas, with higher total gas content and adsorbed gas ratio; The volume fraction of clay minerals and dolomite mainly controls the development of mesopores and macropores, provides the main pore volume, and has a negative correlation with fractal dimension. The combination of hydrocarbon generation, reservoir and development factors suggests that Layer 1 and Layer 3 are beneficial to shale gas retention due to their high TOC content, large fractal dimension and strong brittleness, making them become favorable horizons for shale gas development.

Key words: Longmaxi Formation, reservoir, pore structure, fractal dimension, controlling factors, shallow shale gas, Zhaotong area

中图分类号:

P618.12

赵越, 李磊, 司运航, 王会敏. 浅层页岩气储层孔隙分形特征及控制因素——以云南昭通地区龙马溪组为例[J]. 吉林大学学报(地球科学版), 2022, 52(6): 1813-1829.

Zhao Yue, Li lei, Si Yunhang, Wang Huimin. Fractal Characteristics and Controlling Factors of Pores in Shallow Shale Gas Reservoirs: A Case Study of Longmaxi Formation in Zhaotong Area, Yunnan Province[J]. Journal of Jilin University(Earth Science Edition), 2022, 52(6): 1813-1829.

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浅层页岩气储层孔隙分形特征及控制因素——以云南昭通地区龙马溪组为例

Fractal Characteristics and Controlling Factors of Pores in Shallow Shale Gas Reservoirs: A Case Study of Longmaxi Formation in Zhaotong Area, Yunnan Province

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