Microscopic Seepage Mechanism of Gas and Water in Ultra-Deep Fractured Sandstone Gas Reservoirs of Low Porosity: A Case Study of Keshen Gas Field in Kuqa Depression of Tarim Basin, China

Wang, Rujun; Zhang, Chengze; Chen, Dong; Yang, Fenglai; Li, Haiming; Li, Ming

doi:10.3389/feart.2022.893701

Cited by 6 publications

(2 citation statements)

References 34 publications

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“…Due to the high risk of fluid experiments in sour gas reservoirs, there are few studies on the microscopic percolation of sour gas. Wang [78] studied the microscopic percolation mechanism of gas and water in low porosity fractured sandstone gas reservoirs, taking fractured sandstone gas reservoirs in Kesen gas field, Kuqa Depression, Tarim Basin as an example. Based on rock samples and microscopic visualization techniques, saturated watergas drive NMR and saturated gas-water drive CT scanning experiments were conducted.…”

Section: Recent Research On Mathematical Model Of Co 2 Embedded Coupl...mentioning

confidence: 99%

Review on the Mechanism of CO2 Storage and Enhanced Gas Recovery in Carbonate Sour Gas Reservoir

et al. 2023

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Carbonate gas reservoirs in the Sichuan Basin have many complex characteristics, such as wide distribution, strong heterogeneity, high temperature, high pressure, high H2S and CO2 content and an active edge or bottom water. In the late stage of exploitation of carbonate sour gas reservoirs, the underground depleted reservoirs can provide a broad and favorable space for CO2 storage. If CO2 is injected into the depleted carbonate sour reservoirs for storage, it will help to achieve the goal of carbon neutrality, and the CO2 stored underground can perform as “cushion gas” to prevent the advance of edge or bottom water, to achieve the purpose of enhanced natural gas recovery. Injecting CO2 into low permeability reservoirs for oil displacement has become an important means to enhance oil recovery (EOR). However, the mechanism of EOR by injecting CO2 into carbonate sour gas reservoirs is not clear and the related fundamental research and field application technology are still in the exploration stage. This paper reviews the main scientific and technical perspectives in the process of injecting CO2 into carbonate sour gas reservoirs for storage and enhancing gas recovery.

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Section: Recent Research On Mathematical Model Of Co 2 Embedded Coupl...mentioning

confidence: 99%

Review on the Mechanism of CO2 Storage and Enhanced Gas Recovery in Carbonate Sour Gas Reservoir

et al. 2023

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“…The permeability of fractures determines whether they act as flow pathways for underground fluids. Fracture filling and apertures are the main parameters reflecting fracture effectiveness (Wang et al, 2018;Gong et al, 2021;Xu et al, 2022). The filling degree of fractures can be classified as absent, partly filled, and filled, reflecting the sequential deterioration of their permeability.…”

Section: Effectiveness Of Fracturesmentioning

confidence: 99%

Characteristics, Formation Periods, and Controlling Factors of Tectonic Fractures in Carbonate Geothermal Reservoirs: A Case Study of the Jixianian System in the Xiong'an New Area, China

Zhu

Wang

2023

Acta Geologica Sinica (Eng)

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As typical carbonate geothermal reservoirs with low porosity in North China, the Jixianian System in Xiong'an New Area is the main target for geothermal fluid exploration. This study determined the characteristics, formation periods, and controlling factors of tectonic fractures based on the analyses of outcrops, cores, thin sections, and image logs. The results show that unfilled fractures account for 87.6% and most tectonic fractures are high–angle shear fractures with angles concentrated at 40°–70°. The fracture porosity increases linearly with an increased fracture aperture. Within the same tectonic setting and stress field, lithology and layer thickness are the dominant factors governing the development of tectonic fractures, which are the most developed in dolomites and thin layers. Tectonic fractures were most likely formed in regions near faults or areas with larger stress gradients. The tectonic fractures in carbonate geothermal reservoirs are roughly divided into four sets: NNW–SSE and NNE–SSW oriented “X” conjugated shear fractures formed from the Paleozoic to the pre–Yanshanian Movement; NE–SW–oriented shear fractures formed in episode B of the Yanshanian Movement occurred at early Cretaceous; nearly E–W–oriented tensional fractures formed in the late Yanshanian Movement at the Late Cretaceous to Paleogene, and NEE–SW–oriented shear fractures formed during the Himalayan movement.

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Porosity and Permeability Model of a Regionally Extending Unit (Upper Miocene Sandstones of the Western Part of Sava Depression, Croatia) Based on Vintage Well Data

et al. 2022

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The deep saline aquifer (DSA) Poljana in the Upper Pannonian Poljana Sandstones of Sava depression, the SW part of the Pannonian basin system, was identified as a potential CO2 storage object in previous works. Its boundaries have been redefined and its general model further developed, including the areal distribution of porosity based on analyses of 23 well logs. The sandstones were deposited in turbiditic and deltaic facies that caused considerable variations of porosity, which was further influenced by diagenetic processes. A comparison of altogether 355 pairs of porosity and permeability measurements on core plugs from 16 wells indicated 2 different sets of samples: impermeable samples with effective porosities reaching 18% and permeable samples which showed correlation between porosity and permeability. Accordingly, the permeability model was developed as semi-categorical with two categories: the first category comprising parts of DSA Poljana with porosity values exceeding 18%, where permeability was correlated with porosity, although with limited reliability, and the second category comprising model cells with porosity values below the threshold of 18%, where permeability should not be correlated with porosity due to the appearance of impermeable values. This approach enabled delineation of areas where permeability can be estimated with greater certainty, which is of utmost importance for the planning and development of CO2 storage projects and/or energy storage projects with respect to fluid injectivity. This approach can be used in areas with similar geological settings and limited datasets as an important step from regional capacity estimations towards the detailed, local-scale investigations.

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Microscopic Seepage Mechanism of Gas and Water in Ultra-Deep Fractured Sandstone Gas Reservoirs of Low Porosity: A Case Study of Keshen Gas Field in Kuqa Depression of Tarim Basin, China

Cited by 6 publications

References 34 publications

Review on the Mechanism of CO2 Storage and Enhanced Gas Recovery in Carbonate Sour Gas Reservoir

Review on the Mechanism of CO2 Storage and Enhanced Gas Recovery in Carbonate Sour Gas Reservoir

Characteristics, Formation Periods, and Controlling Factors of Tectonic Fractures in Carbonate Geothermal Reservoirs: A Case Study of the Jixianian System in the Xiong'an New Area, China

Porosity and Permeability Model of a Regionally Extending Unit (Upper Miocene Sandstones of the Western Part of Sava Depression, Croatia) Based on Vintage Well Data

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