The pore characteristics and gas potential of the Jurassic continental shales in the middle-small basins, northwest China

Han, Hwataik; Pang, Peng; Zhong, Ningning; Luo, Qingyong; Ma, Yong; Gao, Yuan

doi:10.1016/j.petrol.2019.106873

Cited by 25 publications

(24 citation statements)

References 46 publications

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“…However, the smooth surfaces of OM grains under the SEM observations were also caused by the limited resolution of SEM as the observation of OM nanopores, smaller than 10 nm, tends to be problematic under SEM. 22 , 54 Therefore, data from gas adsorption are essential.…”

Section: Discussionmentioning

confidence: 99%

Pore Structure of Organic Matter in the Lacustrine Shale from High to Over Mature Stages: An Approach of Artificial Thermal Simulation

2022

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The pore structure of organic matter (OM) is affected by the maturity and type of OM, and these exert an important control on the development of OM pores. However, it is often challenging to distinguish between autochthonous and secondary OM. In this study, different types of OM were distinguished by means of morphology and the form of its occurrence under scanning electron microscopy (SEM) observation. Pyrolyzed samples were used to obtain pore structures of autochthonous and secondary OM from a lacustrine shale from high to over mature stages. The SEM observations indicated that the secondary OM is porous, whereas the autochthonous OM is nonporous. Further, nitrogen adsorption data showed that nanopores in the autochthonous OM are blocked in non-extracted samples and reoccurred after extraction, whereas nanopores in the secondary OM remain open from high to over mature stages. Moreover, the pore structure, i.e., pore type and pore size, differed for autochthonous and secondary OM in the lacustrine shale. For instance, nanopores in the autochthonous OM were micropores (smaller than 1.5 nm); nanopores in the secondary OM were mesopores (ranging from 5 to 20 nm) and micropores. Nanopores in the autochthonous OM were formed at reflectance values (Ro) of 1.50%, but they were slightly destroyed at the over mature stage. Nanopores in the secondary OM were formed at 2.00% Ro and were preserved. Therefore, the development of OM nanopores in the lacustrine shale was synchronously affected by the type of OM and maturity. Furthermore, nanopores in the secondary OM were more developed than those in the autochthonous OM; thus, the OM nanopores at the high mature stage belonged to the autochthonous OM, and those at the over mature stage mainly belonged to the secondary OM. Besides, the nanopores in the autochthonous OM are easily blocked. Therefore, the secondary OM is important to the development of OM nanopores in the lacustrine shale at the over mature stage.

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Section: Discussionmentioning

confidence: 99%

Pore Structure of Organic Matter in the Lacustrine Shale from High to Over Mature Stages: An Approach of Artificial Thermal Simulation

2022

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“…Previous studies have investigated the relationship between the V L and TOC content for shale from different petroliferous basins (Han et al 2020;He et al 2019b;Li et al 2019;Tan et al 2014;Yang et al 2016a), the results indicate that a positive correlation between adsorption capacity of CH 4 and TOC contents can be observed. However, the experimental results in this study reveal that the adsorption capacity of CH 4 is not related to the organic matters, may suggesting that the adsorption capacity of CH 4 can be controlled by other factors.…”

Section: Toc Contentsmentioning

confidence: 87%

Quantitative characterization of pore network and influencing factors of methane adsorption capacity of transitional shale from the southern North China Basin

Liu

Wang

et al. 2021

J Petrol Explor Prod Technol

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Quantitative characterization of pore structure and analysis of influencing factors of methane adsorption are important segments in shale gas reservoir and resources evaluation and have not been systematically carried out in marine–continental shale series. A series of integrated methods, including total organic carbon (TOC) contents, Rock-Eval pyrolysis, mineral composition analysis, pore structure measurement, high-pressure CH4 adsorption analysis and FE-SEM observation, were conducted on 12 transitional shale samples of well WBC-1 in the southern North China Basin (SNCB). The results indicate that TOC contents of the transitional shales range from 1.03 to 8.06% with an average of 2.39%. The transitional shale consists chiefly of quartz, white mica and clay minerals. Interparticle pore, intraparticle pore, dissolution pore and microfracture were observed in the FE-SEM images. The specific surface area (SSA) of BET for the samples ranges from 3.3612 to 12.1217 m2/g (average: 6.9320 m2/g), whereas the DR SSA for the samples ranges from 12.9844 to 35.4267 m2/g (average: 19.67 m2/g). The Langmuir volume (VL) ranges from 2.05 to 4.75 cm3/g (average = 2.43 cm3/g). There is unobvious correction between BET and DR SSA with TOC contents, which means inorganic pores are the main component of pore space in the transitional shale from the SNCB. The relationship of SSA and pore volume shows that micropore has a greater impact on the CH4 adsorption capacity than mesopore–macropore in the transitional shale. Different from shales in other petroliferous basin, clay minerals are the primary factor affecting adsorption capacity of CH4 for transitional shale in this study. The pore structure of the transitional shale for this study is characterized by higher fractal dimension and more heterogeneous pore structure compared to shale in other petroliferous basin. This study provides an example and new revelation for the influencing factors of pore structure and methane adsorption capacity of marine–continental transitional shale.

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“…China's domestic shale gas research mainly focuses on four themes: first, the potential of shale gas resources [53][54][55][56][57]; second, shale gas development in consideration of the current technical difficulties and mining costs [46][47][48], focusing on technological innovation; third, the positive influence of shale gas, which focuses on its energy substitution [20][21][22] and carbon reduction [20,[22][23][24][25] effects; fourth, the negative impact of shale gas [24,25]. The position of our study in the literature is that we consider all the four aspects and the positive and negative effects, and highlight the atmospheric environmental impact.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

“…The answer is "No." The future use of shale gas in China has great potential [53][54][55][56][57], many scholars have conducted research on shale gas potential areas such as Sichuan and Chongqing. In the long run, shale gas will perform well and there is more room for improvement [21,58].…”

Section: Introductionmentioning

confidence: 99%

Integrated Assessment Modeling of China’s Shale Gas Resource: Energy System Optimization, Environmental Cobenefits, and Methane Risk

Yang

Jiang

et al. 2020

Energies

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Comprehensive evaluation of shale gas resource, which plays a role in energy system optimization, atmospheric environmental cobenefit, and methane risk, has long been ignored in China. This research aims to fill this gap and conduct a study based on the China-Multi-pollutant Abatement Planning and Long-term benefit Evaluation model to answer the research question, “When considering environmental and climate risks, does the shale gas resource in China exert a negative or positive effect?” Results show that shale gas plays an important role in replacing coal and optimizing the energy structure. Shale gas can also effectively help reduce the key local pollutant emissions. Approximately 84.85 thousand of deaths (persons) and 32.24 billion yuan of economic loss can be avoided in 2030 with the reduction of SO2 and NOx. The methane risk, which has been disregarded in China when evaluating cobenefits, is also considered in this study. The economic loss due to methane leakage is estimated to reach approximately 2.76 billion yuan on average in 2030. Overall, the net atmospheric environmental cobenefit could reach 68.61 billion yuan on average in 2030, accounting for 0.04% of China’s GDP. This study provides positive evidence for an integrated assessment of shale gas resource in coal-dominant developing countries.

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The pore characteristics and gas potential of the Jurassic continental shales in the middle-small basins, northwest China

Cited by 25 publications

References 46 publications

Pore Structure of Organic Matter in the Lacustrine Shale from High to Over Mature Stages: An Approach of Artificial Thermal Simulation

Pore Structure of Organic Matter in the Lacustrine Shale from High to Over Mature Stages: An Approach of Artificial Thermal Simulation

Quantitative characterization of pore network and influencing factors of methane adsorption capacity of transitional shale from the southern North China Basin

Integrated Assessment Modeling of China’s Shale Gas Resource: Energy System Optimization, Environmental Cobenefits, and Methane Risk

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