Connotation and evaluation technique of geological integrity of UGSs in oil/gas fields

Zheng, Yali; Sun, Jianmeng; Qiu, Xiaosong; Lai, Xin; Liu, Jiandong; Guo, Zeping; Wei, Huan; Min, Zhongshun

doi:10.1016/j.ngib.2020.05.002

Cited by 12 publications

(6 citation statements)

References 3 publications

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“…Faults are one of the important factors controlling traps [37]. The research object of this paper, X9 gas storage, is reconstructed from the lithologic gas reservoir, as shown in the yellow part of Figure 8, which means there is no fault in the reservoir or caprock.…”

Section: Discussionmentioning

confidence: 99%

A Caprock Evaluation Methodology for Underground Gas Storage in a Deep Depleted Gas Reservoir: A Case Study for the X9 Lithologic Trap of Langgu Sag, Bohai Bay Basin, China

Jia

Wen

et al. 2022

Energies

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The evaluation of caprocks’ sealing capacity is exceedingly important for depleted gas reservoirs to be reconstructed into gas storage. In this paper, based on the physical sealing mechanism of caprock, four aspects of ten indexes of caprock quality evaluation were firstly selected, and the related classification standards were established. Secondly, based on the rock mechanical sealing mechanism, elastic and plastic indexes were selected to characterize the mechanical brittleness of caprock, and a brittleness evaluation method of caprock based on complete stress-strain curves was established. Then, a systematic comprehensive evaluation model (including 5 aspects and 12 evaluation indexes) for the sealing capacity of gas storage caprock was proposed, and the analytic hierarchy process (AHP) was used to determine the weight of the 12 indexes in the evaluation model, and the formula for calculating the suitability of the caprock sealing capacity was established. Finally, the geological data, laboratory, and field test data, including X-ray diffraction, poro-permeability test, displacement pressure, and tri-axial compression test, were used for the caprock sealing capacity evaluation of the X9 depleted gas reservoir, and the result from this model showed that the caprock quality is suitable for underground gas storage.

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Section: Discussionmentioning

confidence: 99%

A Caprock Evaluation Methodology for Underground Gas Storage in a Deep Depleted Gas Reservoir: A Case Study for the X9 Lithologic Trap of Langgu Sag, Bohai Bay Basin, China

Jia

Wen

et al. 2022

Energies

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“…Storage in depleted oil and gas reservoirs is prevalent both globally and in China [41,42]. Abundant resources and low construction costs make depleted oil and gas reservoirs attractive for this purpose [43]. However, when using depleted oil and gas reservoirs for large-scale hydrogen storage, attention must be paid to issues such as reduced hydrogen purity and quality loss during storage [41].…”

Section: Introductionmentioning

confidence: 99%

“…Residual oil in the reservoir may lead to decreased hydrogen purity, with hydrogen reacting chemically with it to form gases such as methane, resulting in irreversible hydrogen loss [42]. Therefore, assessing the content and distribution characteristics of residual oil in reservoirs and clarifying the reaction conditions and rates between residual crude oil and hydrogen are crucial when using depleted oil and gas reservoirs for large-scale hydrogen storage [43]. In addition, reactions may occur between stored hydrogen, rocks, formation water, and unexhausted hydrocarbons.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Adsorption in Porous Geological Materials: A Review

Wang,

Jin,

Huang

et al. 2024

Sustainability

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The paper adopts an interdisciplinary approach to comprehensively review the current knowledge in the field of porous geological materials for hydrogen adsorption. It focuses on detailed analyses of the adsorption characteristics of hydrogen in clay minerals, shale, and coal, considering the effect of factors such as pore structure and competitive adsorption with multiple gases. The fundamental principles underlying physically controlled hydrogen storage mechanisms in these porous matrices are explored. The findings show that the adsorption of hydrogen in clay minerals, shale, and coal is predominantly governed by physical adsorption that follows the Langmuir adsorption equation. The adsorption capacity decreases with increasing temperature and increases with increasing pressure. The presence of carbon dioxide and methane affects the adsorption of hydrogen. Pore characteristics—including specific surface area, micropore volume, and pore size—in clay minerals, shale, and coal are crucial factors that influence the adsorption capacity of hydrogen. Micropores play a significant role, allowing hydrogen molecules to interact with multiple pore walls, leading to increased adsorption enthalpy. This comprehensive review provides insights into the hydrogen storage potential of porous geological materials, laying the groundwork for further research and the development of efficient and sustainable hydrogen storage solutions.

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“…There has been a series of serious accidents (e.g., Aliso Canyon, Castaic Hills & Honor Rancho, Playa del Rey) in underground gas storage engineering worldwide [12,13] caused by the sealing failure of caprock, fault and wellbore [14,15], which makes a a very difficult repairment and huge economic losses [12,16]. Except for the gas loss caused by leakage, the chemical reaction or biochemical reaction also cause the huge comsumption of gas or sealing deterioration of caprocks [17].…”

Section: Introductionmentioning

confidence: 99%

“…The faults or fractures in the caprocks are the weak zones of gas sealing. When faults cutting the caprocks are relatively young, the permeability of the fault zone is usually large, and the fault zone becomes the main migration pathway for fluids [12,21]. With an increase in pore pressure in the caprock, due to continuous gas accumulation, the overpressure strengthens the opening and slipping of faults, which diminishes the sealing performance of the caprocks [22,23].…”

Section: Introductionmentioning

confidence: 99%

Numerical Tracking of Natural Gas Migration in Underground Gas Storage with Multilayered Sandstone and Fault-Bearing Caprocks

et al. 2023

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The structure of caprocks is often greatly altered by different scales of faults or fissures in long-term geological tectonic evolution, and the sealing performance may be deteriorated. In this paper, a simplified geological model characterized as multilayered sandstone and fault-bearing caprocks extracted from the Shuang 6 underground gas storage located in the Liaohe oilfield was established. Different fault geometry (e.g., fault length, fault dip angle, and fault type) and seepage attributes (porosity and permeability) were considered to illustrate their impacts on natural gas migration during the cyclic high rate of injection and production of natural gas. The results showed that the seepage anisotropy and the natural gas front are strongly affected by the formation properties and, especially, are hindered by the low permeability sandstone layers. The difference in the lateral migration distance of natural gas in different layers can reach 110 m at the end of the injection period, with an annual injection volume of 108 m3. The migration of natural gas along the fault zone is mainly controlled by the permeability of faults, followed by fault scale, fault dip angle, and fault type. The sealing failure of caprocks in the fault zone does not occur based on the simulated gas migration distribution, showing that a very limited amount of natural gas migrates into the caprocks.

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Connotation and evaluation technique of geological integrity of UGSs in oil/gas fields

Cited by 12 publications

References 3 publications

A Caprock Evaluation Methodology for Underground Gas Storage in a Deep Depleted Gas Reservoir: A Case Study for the X9 Lithologic Trap of Langgu Sag, Bohai Bay Basin, China

A Caprock Evaluation Methodology for Underground Gas Storage in a Deep Depleted Gas Reservoir: A Case Study for the X9 Lithologic Trap of Langgu Sag, Bohai Bay Basin, China

Hydrogen Adsorption in Porous Geological Materials: A Review

Numerical Tracking of Natural Gas Migration in Underground Gas Storage with Multilayered Sandstone and Fault-Bearing Caprocks

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