The identification of normal to underpressured formations in the Southeastern Sichuan basin

Mgimba, Melckzedeck Michael; Jiang, Shu; Mwakipunda, Grant Charles

doi:10.1016/j.petrol.2022.111085

Cited by 6 publications

(3 citation statements)

References 43 publications

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“…This energy increase will be associated with the GHGs released into the atmosphere, especially carbon dioxide (CO 2 ), which accounts for ∼55% and leads to global warming effects and air pollution, as shown in Figure . The top five countries for CO 2 emissions around the world are China with 11,472 million metric tons, United States with 5,007 million metric tons, India with 2,710 million metric tons, Russia with 1,756 million metric tons, and Japan with 1,067 million metric tons by 2022. − Carbon capture, utilization, and storage (CCUS) is the primary method to reduce GHGs in the atmosphere to meet the Paris Climate Accords agreement to achieve net zero emissions by 2050 and a maximum global temperature rise of 1.5 °C. − It involves capturing, transporting, and storing CO 2 underground or utilizing it for industrial purposes . There are many options in which CO 2 can be stored, namely, biotic, geologic, and oceanic sequestration, as discussed by ref .…”

Section: Introductionmentioning

confidence: 99%

Critical Review on Carbon Dioxide Sequestration Potentiality in Methane Hydrate Reservoirs via CO₂–CH₄ Exchange: Experiments, Simulations, and Pilot Test Applications

et al. 2023

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Many researchers have investigated the potential of methane hydrate reservoirs (MHRs) for carbon dioxide (CO2) sequestration and methane (CH4) production through the CO2–CH4 replacement method. This technique is not yet commercially implemented due to various limitations, especially economic reasons. This study investigated recent advancements in MHRs potentiality for CO2 sequestration through CO2 or mixed gas exchange injection while recovering CH4. From the experiments, modeling, and simulations, and one pilot test conducted, it was found that there is a great potentiality of sequestrating CO2 in MHRs while recovering CH4. In addition, it was revealed that to produce more CH4, the nitrogen/hydrogen (N2/H2) mole fraction in the injector gas stream should be more significant than that in CO2, while to sequestrate more CO2, the CO2 mole fraction in the injector gas stream should be greater than the N2/H2 mole fraction. The CO2–mixture gases mole fraction ratio recommended from one successful pilot test conducted was 23:77 (CO2/N2), which revealed that approximately 60% of injected CO2 was sequestrated with 855 × 103 standard cubic feet of CH4 produced. The challenges identified in this review will urge researchers to explore suitable technologies to conduct more pilot tests and pave the way toward entire field operations on CO2 sequestration in MHRs toward decarbonization.

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Section: Introductionmentioning

confidence: 99%

Critical Review on Carbon Dioxide Sequestration Potentiality in Methane Hydrate Reservoirs via CO₂–CH₄ Exchange: Experiments, Simulations, and Pilot Test Applications

et al. 2023

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“…Shale gas exploration is rapidly progressing into complex geological and geophysical settings; thus, systematic procedures to improve exploration and production are essential to support global energy requirements [4]. Consequently, multiple approaches are necessary to integrate geology, geophysics, petrophysics, geomechanics, geostatistics, and reservoir engineering [4][5][6]. According to the distribution and composition of global resources, the potential reserves of unconventional resources, especially shale gas, are equivalent to conventional gas resources [7].…”

Section: Introductionmentioning

confidence: 99%

Shale Gas Reservoir Pore Pressure Prediction: A Case Study of the Wufeng–Longmaxi Formations in Sichuan Basin, Southwest China

Kablan,

Chen

2023

Energies

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Pore pressure prediction is critical for shale gas reservoir characterization and simulation. The Wufeng–Longmaxi shale, in the southeastern margin of the Sichuan Basin, is identified as a complex reservoir affected by overpressure generation mechanisms and variability in lithification. Thus, standard methods need to be adapted to consistently evaluate pore pressure in this basin. Based on wireline logs, formation pressure tests, and geological data, this study applied the Eaton–Yale approach, which extends the theoretical basis of Eaton and Bowers methods to reservoir geological conditions and basin history. The method was developed by integrating petrophysical properties, rock physics interpretations, and geology information. The essential steps include (1) a multi-mineral analysis to determine mineral and fluid volumes; (2) a determination of the normal pressure trend line and extending it to overpressured sections; (3) predicting pore pressure using the basic Eaton approach and identifying overpressured zones; (4) correcting compressional velocity using lithology logs and a rock physics model; (5) determining the Biot Alpha coefficient and vertical-effective stress and estimating the new pore pressure values using the Eaton–Yale method. Overpressure zones were corrected, and reservoir pore pressure varied between 30.354 and 34.959 MPa in the wells. These research results can provide a basis for building reservoir simulation models, identifying reservoir boundaries, and predicting relative permeability.

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“…Remarkable breakthroughs have been achieved in the study of paleokarst reservoirs, such as the identification of a dolomite gas reservoir in the Ordovician Majiagou Formation in the central Ordos Basin [6][7][8][9], as well as the exploration of an Ordovician limestone reservoir in the Tahe oilfield, Tarim Basin [10][11][12][13]. Additionally, the Carboniferous dolomite gas reservoir in the Huanglong Formation within the Sichuan Basin serves as an exemplary case study [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Karstification and Its Role in the Formation of Carbonate Reservoirs: A Case Study from the Ordovician Majiagou Formation in Jingbian, Ordos Basin, North China

Peng,

Li,

Cheng

et al. 2023

Minerals

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The discovery of natural gas reserves in Lower Paleozoic carbonate formations has generated significant enthusiasm regarding the potential for oil and gas exploration in the deeper carbonate reservoirs of the Ordos Basin. Significant progress has been made in the field of natural gas exploration, especially within the carbonate reservoirs of the Ordovician Majiagou Formation. In this study, we conducted a comprehensive analysis, including microscopic examination of thin sections and the inspection of 60-m cores from five wells, to classify pore types and investigate various forms of karstification in the fifth member of the Majiagou Formation. Our findings have identified distinct pore types, including interparticle pores, separate-vuggy pores, and touching-vuggy pores, in this formation. The dominant forms of karstification in this area were identified as syngenetic karstification, weathering crust karstification, and burial karstification. Importantly, our investigation emphasizes the significant influence of factors such as sea level fluctuations, exposure duration, and the presence of acidic formation water in shaping the observed patterns of karstification. Syngenetic karstification and shallow-buried karstification have emerged as key stages in the formation of natural gas reservoirs. Moreover, our research emphasizes the importance of structural and composite fractures observed in the fifth member of the Majiagou Formation. These unfilled fractures serve as crucial microfracture networks, facilitating oil and gas migration and contributing to the overall development of reservoirs. The research results are of great significance for understanding the formation process of carbonate reservoirs in the Majiagou Formation, Ordos Basin.

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The identification of normal to underpressured formations in the Southeastern Sichuan basin

Cited by 6 publications

References 43 publications

Critical Review on Carbon Dioxide Sequestration Potentiality in Methane Hydrate Reservoirs via CO₂–CH₄ Exchange: Experiments, Simulations, and Pilot Test Applications

Critical Review on Carbon Dioxide Sequestration Potentiality in Methane Hydrate Reservoirs via CO₂–CH₄ Exchange: Experiments, Simulations, and Pilot Test Applications

Shale Gas Reservoir Pore Pressure Prediction: A Case Study of the Wufeng–Longmaxi Formations in Sichuan Basin, Southwest China

Karstification and Its Role in the Formation of Carbonate Reservoirs: A Case Study from the Ordovician Majiagou Formation in Jingbian, Ordos Basin, North China

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The identification of normal to underpressured formations in the Southeastern Sichuan basin

Cited by 6 publications

References 43 publications

Critical Review on Carbon Dioxide Sequestration Potentiality in Methane Hydrate Reservoirs via CO2–CH4 Exchange: Experiments, Simulations, and Pilot Test Applications

Critical Review on Carbon Dioxide Sequestration Potentiality in Methane Hydrate Reservoirs via CO2–CH4 Exchange: Experiments, Simulations, and Pilot Test Applications

Shale Gas Reservoir Pore Pressure Prediction: A Case Study of the Wufeng–Longmaxi Formations in Sichuan Basin, Southwest China

Karstification and Its Role in the Formation of Carbonate Reservoirs: A Case Study from the Ordovician Majiagou Formation in Jingbian, Ordos Basin, North China

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Critical Review on Carbon Dioxide Sequestration Potentiality in Methane Hydrate Reservoirs via CO₂–CH₄ Exchange: Experiments, Simulations, and Pilot Test Applications

Critical Review on Carbon Dioxide Sequestration Potentiality in Methane Hydrate Reservoirs via CO₂–CH₄ Exchange: Experiments, Simulations, and Pilot Test Applications