Assessment of global unconventional oil and gas resources

Wang, Hongjun; Ma, Feng; Tong, Xiaoguang; Liu, Zuodong; Zhang, Xinshun; Wu, Zhenzhen; Li, Denghua; Wang, Bo; Xie, Yinfu; Yang, Liuyan

doi:10.1016/s1876-3804(16)30111-2

Cited by 226 publications

(89 citation statements)

References 16 publications

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“…Shale gas refers to natural gas occurring in organic rich shale reservoirs in free and absorbed states. Shale gas wells generally have no natural production capacity but can obtain industrial production with some technical measures under certain economic conditions [2]. The development of unconventional gas resources is increasingly influencing regional and global gas markets [3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Miocene Biogas Generation System in the Carpathian Foredeep (SE Poland): A Basin Modeling Study to Assess the Potential of Unconventional Mudstone Reservoirs

et al. 2020

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This paper presents the results of a research project aimed at evaluating the unconventional natural gas potential of the autochthonous Miocene sediments in the Polish part of the Carpathian Foredeep. The primary objective of the study was to re-evaluate the biogenic gas generation system within Miocene sediments, paying special attention to unconventional gas resources accumulated in tight mudstone formations. The four-dimensional (4D) petroleum system modeling method (PetroMod software) was used to reconstruct the basin geometry and three-dimensional (3D) evolution through a geological timescale, in particular the progress of gas generation, migration, and accumulation processes, as well as their consequences for gas exploration and development. Special attention was paid to the dynamics of gas generation processes and the advancement of sediment compaction and their time dependence, as well as to the progress and outcomes of gas migration and accumulation processes. The results indicate significant potential for unconventional gas accumulations in mudstone reservoirs. However, part of the biogenic gas resources occurs in a dispersed form. Analysis of the dynamics of biogenic gas generation and accumulation conducted on a basin scale and within particular sedimentary complexes and depth intervals allowed an indication of the premises regarding the most favorable zones for mudstone–claystone reservoir exploration.

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Section: Introductionmentioning

confidence: 99%

Miocene Biogas Generation System in the Carpathian Foredeep (SE Poland): A Basin Modeling Study to Assess the Potential of Unconventional Mudstone Reservoirs

et al. 2020

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“…The tight sandstone gas reservoir is the main type of unconventional natural gas reservoir and is also the largest unconventional natural gas reservoir in the world. Its significance and role in natural gas resources are becoming more and more obvious [3]. China's tight gas reservoirs are widely distributed in more than 10 basins such as Ordos, Sichuan, Songliao, Bohai Bay, Qaidam, Tarim, Junggar, etc.…”

Section: Introductionmentioning

confidence: 99%

The Feasibility Appraisal for CO2 Enhanced Gas Recovery of Tight Gas Reservoir: Experimental Investigation and Numerical Model

et al. 2019

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This paper proves the soundness of supercritical CO2 displacement for enhancing gas recovery of a tight gas reservoir via laboratory investigations and compositional modeling. First, a novel phase behavior experimental device with a screened supercritical CO2 dyeing agent were first presented to better understand the mixture characteristics between supercritical CO2 and natural gas. The mass transfer between two vapor phases was also measured. Then, based on experimental results, the compositional model considering the influence of CO2 diffusion on the gas recovery and critical property adjustment of supercritical CO2 was established. The miscibility process and mixing properties, such as density, viscosity, and the flowing velocity vector, of supercriticalCO2 and natural gas were visualized through a 3D display, which obtained a better understanding of the flooding mechanism of Enhanced Gas Recovery (EGR) via supercritical CO2. Finally, with experiments and numerical simulations, the main benefits of CO2 EGR were shown, which were partial miscibility between CO2 and natural gas, pressure maintenance, and CO2 displacement as a “gas cushion.” In general, experiments and numerical simulations demonstrate that CO2 EGR can be seen as a promising way of prolonging the productive life and enhancing recovery of tight gas reservoirs.

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“…China is rich in shale gas too. The shale resources in China are mainly located in the Sichuan, Ordos, Bohai Bay, Songliao, Tarim and Junggar Basins, with an estimated volume in place between 1.5 9 10 13 and 3.0 9 10 13 m 3 (Zhang et al 2008;Jia 2017;Jiang et al 2015;Wang et al 2016). Shale gas fields of the Sichuan Basin are mostly located in the Fuling area in eastern Sichuan; and the Weiyuan, Changning, Zhaotong and Fushun-Yongchuan areas in southern Sichuan.…”

Section: Introductionmentioning

confidence: 99%

Study of the relationship between fractures and highly productive shale gas zones, Longmaxi Formation, Jiaoshiba area in eastern Sichuan

Sun

Liu

et al. 2018

Pet. Sci.

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Shale fractures are an important factor controlling shale gas enrichment and high-productivity zones in the Longmaxi Formation, Jiaoshiba area in eastern Sichuan. Drilling results have, however, shown that the shale fracture density does not have a straightforward correlation with shale gas productivity. Based on logging data, drilling and seismic data, the relationship between shale fracture and shale gas accumulation is investigated by integrating the results of experiments and geophysical methods. The following conclusions have been drawn: (1) Tracer diffusion tests indicate that zones of fracture act as favorable channels for shale gas migration and high-angle fractures promote gas accumulation. (2) Based on the result of azimuthal anisotropy prediction, a fracture system with anisotropy strength values between 1 and 1.15 represents a moderate development of high-angle fractures, which is considered to be favorable for shale gas accumulation and high productivity, while fracture systems with anisotropy strength values larger than 1.15 indicate over-development of shale fracture, which may result in the destruction of the shale reservoir preservation conditions. Keywords Azimuthal anisotropy Á Fracture prediction Á Shale Á Shale gas Á Shale reservoir preservation conditions IntroductionAccording to the 2013 statistics from the United States Energy Information Administration, the global technically available resource of shale gas is up to 2.07 9 10 14 m 3 (EIA 2013). China is rich in shale gas too. The shale resources in China are mainly located in the Sichuan, Ordos, Bohai Bay, Songliao, Tarim and Junggar Basins, with an estimated volume in place between 1.5 9 10 13 and 3.0 9 10 13 m 3 (Zhang et al. 2008;Jia 2017;Jiang et al. 2015;Wang et al. 2016). Shale gas fields of the Sichuan Basin are mostly located in the Fuling area in eastern Sichuan; and the Weiyuan, Changning, Zhaotong and Fushun-Yongchuan areas in southern Sichuan. Among these, the shale gas fields of the Jiaoshiba area in Fuling contribute an annual production of 5.0 9 10 9 m 3 (Guo 2016a, b; Wang 2017). Both the reservoir space and accumulation mechanisms of shale gas are complex (Liang et al. 2012; Gale et al. 2014;Deng et al. 2015;Tenger et al. 2017), and it is difficult to ascertain the key factor controlling shale gas accumulation (Guo and Zhang 2014;Jin et al. 2016;Guo et al. 2017). This comprehensive study considers that shale fractures are a key factor controlling shale gas accumulation and productivity. For conventional oil and gas, shale fractures serve as both oil and gas accumulation space and migration channels for hydrocarbons. However, drilling results have shown that natural shale fractures are not always positively correlated with high productivity. Particularly in fracture over-developed reservoirs, the shale gas production rates seem to be inadequate. Therefore, it is imperative to determine how to establish the relationship between fracture development and the production by available geological and geophysical methods...

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Assessment of global unconventional oil and gas resources

Cited by 226 publications

References 16 publications

Miocene Biogas Generation System in the Carpathian Foredeep (SE Poland): A Basin Modeling Study to Assess the Potential of Unconventional Mudstone Reservoirs

Miocene Biogas Generation System in the Carpathian Foredeep (SE Poland): A Basin Modeling Study to Assess the Potential of Unconventional Mudstone Reservoirs

The Feasibility Appraisal for CO2 Enhanced Gas Recovery of Tight Gas Reservoir: Experimental Investigation and Numerical Model

Study of the relationship between fractures and highly productive shale gas zones, Longmaxi Formation, Jiaoshiba area in eastern Sichuan

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