Process and Controlling Factors of Pore Evolution in Marine-Continental Transitional Black Shale-An Example From Permian Shanxi Formation in the Eastern Margin of Ordos Basin

被引:3
作者
Wu, Jin [1 ,2 ]
Zhang, Xiaowei [1 ,2 ]
Xu, Hao [3 ]
Xiao, Yufeng [1 ,2 ]
Liu, Guiying [3 ]
Jiang, Lingfeng [3 ]
Deng, Naier [3 ]
Ren, Zihe [3 ]
机构
[1] PetroChina Res Inst Petr Explorat & Dev, Beijing, Peoples R China
[2] Natl Energy Shale Gas R&D Expt Ctr, Beijing, Peoples R China
[3] Chengdu Univ Technol, State Key Lab Oil & Gas Reservoir Geol & Exploitat, Chengdu, Peoples R China
基金
中国国家自然科学基金;
关键词
porosity evolution; thermal simulation; marine-continental transitional shale; shanxi formation; ordos basin; ORGANIC-MATTER; SICHUAN BASIN; RICH SHALES; POROSITY; GAS; LONGMAXI; MINERALS; AREA; SEM;
D O I
10.3389/feart.2022.889067
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
Pore and pore network evolution of shale is critical for the evaluation the pore system in shale gas reservoirs. Thermal maturation effect acts as an indispensable role in porosity evolution. In this paper, high-temperature and high-pressure in-situ thermal simulation experiments were conducted to investigate the process and controlling factors of pore evolution in marine-continental transitional shale. Multiple methods, including scanning electron microscopy (SEM), X-ray diffraction, helium porosimetry and low-pressure N2 and CO2 adsorption were used to investigate the evolution of mineral composition and pore structure at different stages of thermal maturity. The results showed that type III organic matter (OM) generated petroleum with the thermal maturity increasing. The total organic carbon (TOC) decreased by 13.3% when temperature reached 607 degrees C. At the same time, it produced numerous organic and mineral pores during hydrocarbon generation. Besides, some changes in mineral composition have occurred, especially in illite (from 11% to 31%) and kaolinite (from 89% to 69%). In general, it can divide into 3 stages (maturity, high maturity and over maturity) for shale pore system evolution with the thermal maturity increasing. In the low maturity period, large amounts of pyrolytic bitumen and oil generated to fill the pores, causing the pore system to diminish; in the high maturity period, a large number of pores were generated when oil is cracked into gas, resulting in a rapid expansion of the pore system; in the over-maturity period, the cracking of pyrolysis and hydrocarbon slowed down, allowing the pore system to stabilize. Shale pore evolution is primarily controlled by the thermal evolution of OM, and the conversion of inorganic minerals contributes less to pore evolution compared to organic matter. The high maturity period (1.2% < Ro < 2.0%) was the period when extensive pyrolysis and hydrocarbon generated in the Shanxi Formation shale, which contributed mostly for the pores generation and accumulation of shale gas.
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页数:12
相关论文
共 51 条
[1]   Permeability prediction using hydraulic flow units and electrofacies analysis [J].
Bhatti, Amanat Ali ;
Ismail, Atif ;
Raza, Arshad ;
Gholami, Raoof ;
Rezaee, Reza ;
Nagarajan, Ramasamy ;
Saffou, Eric .
ENERGY GEOSCIENCE, 2020, 1 (1-2) :81-91
[2]   Influence of experimental temperature and duration of laboratory confined thermal maturation experiments on the evolution of the porosity of organic-rich source rocks [J].
Cavelan, Amelie ;
Boussafir, Mohammed ;
Le Milbeau, Claude ;
Delpeux, Sandrine ;
Laggoun-Defarge, Fatima .
MARINE AND PETROLEUM GEOLOGY, 2020, 122 (122)
[3]   Evolution of nanoporosity in organic-rich shales during thermal maturation [J].
Chen, Ji ;
Xiao, Xianming .
FUEL, 2014, 129 :173-181
[4]   Differential enrichment mechanism of organic matters in the marine-continental transitional shale in northeastern Ordos Basin, China: Control of sedimentary environments [J].
Chen, Yuhang ;
Wang, Yingbin ;
Guo, Mingqiang ;
Wu, Heyuan ;
Li, Jun ;
Wu, Weitao ;
Zhao, Jingzhou .
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING, 2020, 83
[5]   Fracture identification and evaluation using conventional logs in tight sandstones: A case study in the Ordos Basin, China [J].
Dong, Shaoqun ;
Zeng, Lianbo ;
Lyu, Wenya ;
Xia, Dongling ;
Liu, Guoping ;
Wu, Yue ;
Du, Xiangyi .
ENERGY GEOSCIENCE, 2020, 1 (3-4) :115-123
[6]   Porosity characteristics of the Devonian Horn River shale, Canada: Insights from lithofacies classification and shale composition [J].
Dong, Tian ;
Harris, Nicholas B. ;
Ayranci, Korhan ;
Twemlow, Cory E. ;
Nassichuk, Brent R. .
INTERNATIONAL JOURNAL OF COAL GEOLOGY, 2015, 141 :74-90
[7]  
Gao F., 2021, J Mining Strata Contr Eng, V3, P023032, DOI [10.13532/j.jmsce.cn10-1638/td.20210329.001, DOI 10.13532/J.JMSCE.CN10-1638/TD.20210329.001]
[8]   采动影响下巷道围岩变形破坏规律 [J].
郭良林 ;
周大伟 ;
张德民 ;
周宝慧 .
采矿与岩层控制工程学报, 2021, 3 (02) :42-49
[9]   Evaluation of sweet spots and horizontal-well-design technology for shale gas in the basin-margin transition zone of southeastern Chongqing, SW China [J].
He, Xipeng ;
Zhang, Peixian ;
He, Guisong ;
Gao, Yuqiao ;
Liu, Ming ;
Zhang, Yong ;
Fang, Dazhi ;
Li, Yanjing .
ENERGY GEOSCIENCE, 2020, 1 (3-4) :134-146
[10]   Evolution mechanism of dynamic thermal parameters of shale [J].
Hou, Lianhua ;
Cui, Jingwei ;
Zhang, Yan .
MARINE AND PETROLEUM GEOLOGY, 2022, 138