Development status and prospect of tight sandstone gas in China

Jia, Ailin; Wei, Yunsheng; Guo, Zhi; Wang, Guoting; Meng, Dewei; Huang, Suqi

doi:10.1016/j.ngib.2022.10.001

Cited by 38 publications

(24 citation statements)

References 7 publications

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“…According to the electrical characteristics, the underwater distributary channel and interdistributary bay microfacies are divided. Among them, the underwater distributary channel sand body is the skeleton sand body of 2 Geofluids the study area, and several underwater distributary channels are developed, with a channel width of 2~4 km. The sand bodies are staggered and superimposed and distributed in a large area on the plane.…”

Section: Overview Of Regional Geologymentioning

confidence: 99%

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Differential Occurrence Characteristics and Influence Factors of Reservoir Movable Fluids in Tight Gas: A Case Study of Shan 1 Reservoir in Yanchang Area

Liu

2023

Geofluids

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The occurrence characteristic of movable fluid is a crucial index for tight sandstone reservoir evaluation, and the study of the differential occurrence of reservoir movable fluid is vitally important for the exploration and development of tight gas. Therefore, on the basis of casting thin section, scanning electron microscope, X-ray diffraction, high-pressure mercury injection, and nuclear magnetic resonance testing, the differential occurrence characteristics and influencing factors of reservoir movable fluid are analyzed based on the reservoir of Shan 1 reservoir. The results show that the main types of Shan 1 reservoir are lithic quartz sandstone and lithic sandstone, and intergranular solution pores and cutting solution pores are mainly developed in Shan 1 reservoir in Yanchang area. The movable fluid saturation of Shan 1 reservoir is 21.64%~69.62%, and the average of the movable fluid saturation is 35.32%. Most of the T 2 spectra are unimodal. According to the pore development, the reservoir is divided into four types, and fluid flow property in reservoir varies with the difference of reservoir pore development. Sandstone types, reservoir porosity, permeability, pore type, pore throat parameters, and cement content affect movable fluid saturation. The pores provide the main space for the movable fluid. The better the development of intergranular solution pores, the larger the average pore throat radius and the higher the movable fluid saturation of the reservoir. The higher the content of the calcite, the more obvious pore loss of the reservoir and the lower movable fluid saturation in the reservoir. The higher the content of illite, the worse the pore evolution and the lower fluid flow property in reservoir.

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Section: Overview Of Regional Geologymentioning

confidence: 99%

“…Tight sandstone gas is an important field of unconventional natural gas exploration [1,2]. Domestic tight sandstone gas fields are mainly distributed in Ordos Basin, Sichuan Basin, and Tarim Basin.…”

Section: Introductionmentioning

confidence: 99%

Differential Occurrence Characteristics and Influence Factors of Reservoir Movable Fluids in Tight Gas: A Case Study of Shan 1 Reservoir in Yanchang Area

Liu

2023

Geofluids

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“…China's reserves of onshore tight gas are substantial, with an estimated more than 20 trillion m 3 of proven reserves as of 2021 [1,2]. The applications of hydraulic fracturing technology have facilitated the extraction of the natural gas, and accounted for approximately 24.4% of China's total natural gas production in 2020, which amounted to 47 billion m 3 [3]. The Ordos Basin in western China has experienced significant growth in the tight gas production over the past decade, with several giant gas fields having more than 4 trillion m 3 reserves.…”

Section: Introductionmentioning

confidence: 99%

Interpretable Predictive Modeling of Tight Gas Well Productivity with SHAP and LIME Techniques

Hou

Zhan

et al. 2023

Energies

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Accurately predicting well productivity is crucial for optimizing gas production and maximizing recovery from tight gas reservoirs. Machine learning (ML) techniques have been applied to build predictive models for the well productivity, but their high complexity and low interpretability can hinder their practical application. This study proposes using interpretable ML solutions, SHapley Additive exPlanations (SHAP) and Local Interpretable Model-agnostic Explanations (LIME), to provide explicit explanations of the ML prediction model. The study uses data from the Eastern Sulige tight gas field in the Ordos Basin, China, containing various geological and engineering factors. The results show that the gradient boosting decision tree model exhibits superior predictive performance compared to other ML models. The global interpretation using SHAP provides insights into the overall impact of these factors, while the local interpretation using SHAP and LIME offers individualized explanations of well productivity predictions. These results can facilitate improvements in well operations and field development planning, providing a better understanding of the underlying physical processes and supporting more informed and effective decision-making. Ultimately, this study demonstrates the potential of interpretable ML solutions to address the challenges of forecasting well productivity in tight gas reservoirs and enable more efficient and sustainable gas production.

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“…As an essential component of unconventional oil and gas, tight sandstone gas has become the most crucial source to replace conventional petroleum resources in the next 10–20 years. − In 2021, the production of tight gas in China has reached 500 × 10 8 m 3 , accounting for approximately 61.96% of the total unconventional gas production, and the gas production in the Ordos Basin has exceeded 360 × 10 8 m 3 , suggesting its enormous resource potential of tight sandstone gas . The Sulige gas field is a well-known gas field in the Ordos Basin, and its main intervals for gas production are the Shihezi Formation in the Middle Permian and the Shanxi Formation in the Lower Permian.…”

Section: Introductionmentioning

confidence: 99%

Characteristics and Controlling Factors of Tight Gas Sandstones from the Upper Shanxi and Lower Shihezi Formations in the Northern Sulige Area, Ordos Basin, China

Xu,

Yu,

et al. 2023

Energy Fuels

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Tight sandstone gas reservoirs with ultralow porosity (<10%) and permeability (<1.0 mD) in the Ordos Basin exhibit enormous resource potential. In this work, the characteristics of highquality tight sandstone reservoirs in the eighth member of the Shihezi Formation (He 8) and the first member of the Shanxi Formation (Shan 1) of the northern Sulige area are investigated. To study the characteristics and controlling factors of the tight sandstone, various technical methods, including casting thin sections, scanning electron microscopy (SEM), X-ray diffraction (XRD), mercury injection capillary pressure (MICP), and spontaneous imbibition, are conducted on typical sandstone samples. The results show that the He 8 and Shan 1 sandstones predominantly consist of medium-to fine-grained sandstones with high compositional maturity levels. These sandstone reservoirs have low porosity (mainly <12%) and ultralow permeability (mainly <0.5 mD), with a good correlation between porosity and permeability. Intragranular dissolved pores are predominant in both the He 8 and Shan 1 sandstones. In comparison to the He 8 Member, sandstones from the Shan 1 Member are much tighter, resulting in lower porosity and poor pore connectivity. Sedimentation and diagenesis play crucial roles in the development of high-quality reservoirs in the study area. High-quality reservoirs, mainly developed in the point bar and braided bar, are fine−medium sandstones with good sorting, followed by natural levee. Destructive diagenesis, including compaction and cementation, has significantly reduced pore volumes and reservoir physical properties, while extensive dissolution pores are generated by dissolution to improve reservoir space. Moreover, the presence of chlorite rims with an appropriate content can enhance the physical properties of sandstone reservoirs. Therefore, the findings of this work are beneficial for the predication and identification of high-quality reservoirs in the Ordos Basin, thus providing a foundation for further exploration of favorable reservoirs.

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Development status and prospect of tight sandstone gas in China

Cited by 38 publications

References 7 publications

Differential Occurrence Characteristics and Influence Factors of Reservoir Movable Fluids in Tight Gas: A Case Study of Shan 1 Reservoir in Yanchang Area

Differential Occurrence Characteristics and Influence Factors of Reservoir Movable Fluids in Tight Gas: A Case Study of Shan 1 Reservoir in Yanchang Area

Interpretable Predictive Modeling of Tight Gas Well Productivity with SHAP and LIME Techniques

Characteristics and Controlling Factors of Tight Gas Sandstones from the Upper Shanxi and Lower Shihezi Formations in the Northern Sulige Area, Ordos Basin, China

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