Deformation Mechanism and Vertical Sealing Capacity of Fault in the Mudstone Caprock

Fu, Xiaofei; Yan, Lingyu; Meng, Lingdong

doi:10.1007/s12583-018-0998-7

Cited by 25 publications

(15 citation statements)

References 43 publications

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“…The theory of rock deformation suggests that plastic deformation of mudstone occurs when the pressure reaches the elastic limit of the rock. 33 Some studies have shown that in a compressive fault when the pressure does not exceed the plastic deformation limit of mudstone and the fault plane is closed under pressure, the mudstone is undeformed, rock voids are not blocked by the deformed mudstone, and the rock in the fault zone maintains its original permeability and sealing properties. However, when the pressure exceeds the plastic deformation limit of the mudstone, the voids in the rock of the fault zone become filled by deformed mudstone, which reduces the permeability of the fault zone and prevents the migration of the fluid.…”

Section: Datamentioning

confidence: 99%

“…Under high fault pressure, voids in the rock mass in the fault zone become filled by deformed mudstone, which reduces the permeability of the rock mass and results in poor hydraulic conductive property along the fault. 33 For quantitative evaluation, the MDC, which is defined as the ratio of the normal stress of the fault plane to the elastic limit of the mudstone, was selected. The elastic limit of the mudstone was determined based on core mechanical tests of boreholes near the fault zone.…”

Section: Datamentioning

confidence: 99%

“…The theory of rock deformation suggests that plastic deformation of mudstone occurs when the pressure reaches the elastic limit of the rock . Some studies have shown that in a compressive fault when the pressure does not exceed the plastic deformation limit of mudstone and the fault plane is closed under pressure, the mudstone is undeformed, rock voids are not blocked by the deformed mudstone, and the rock in the fault zone maintains its original permeability and sealing properties.…”

Section: Datamentioning

confidence: 99%

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Method for Evaluating Fault Hydraulic Conductive Property and Its Application in Shandong, China

et al. 2022

ACS Omega

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Coal remains the largest contributor to the energy structure of China. However, coal production is frequently threatened by groundwater inrush accidents caused by hydraulically conductive faults. Despite the threat of such accidents, research on methods for evaluating fault hydraulic conductive property without hydraulic tests has seldom been conducted. Many faults exist in coal mines in Shandong, China. However, due to economic and technical limitations, hydrological tests are rarely performed and can be performed on only a few faults. The hydraulic conductive property of many faults is unknown, which has prevented serious groundwater inrush accidents and casualties from being avoided. Using accessible geological exploration data, we propose a method for evaluating fault hydraulic conductive property in the Jining coalfield, Shandong, China. Mudstone smearing, lithologic contact relations on the fault plane, geostress, water pressure, plastic deformation of mudstone, and the argillaceous content of the fault zone were selected as factors, and six quantitative indicators were proposed: the shale gouge ratio (SGR), lithologic juxtaposition diagram (LJD), fault closure coefficient (FCC), water pressure coefficient (WPC), mudstone deformation coefficient (MDC), and shale smear factor (SSF). The fuzzy analytic hierarchy process (FAHP) was applied to calculate the weights and establish lateral and vertical hydraulic conductive property (L and V) evaluation models for faults. The fault hydraulic conductivities were then classified as weak, medium, or strong. The hydrochemical experiments and the limited number of exposed faults were used for validation. Hence, the evaluation models were considered effective at determining the hydraulic conductive property of faults in the Jining coalfield, China.

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Section: Datamentioning

confidence: 99%

Section: Datamentioning

confidence: 99%

Section: Datamentioning

confidence: 99%

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Method for Evaluating Fault Hydraulic Conductive Property and Its Application in Shandong, China

et al. 2022

ACS Omega

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“…The first (J 2 q 1 ) is 70 m thick, and comprised mainly of feldspathic quartzarenite, with minor constituents of black carbonaceous mudstone and thin coal seams, yielding abundant bivalve fossils. The second member (J 2 q 2 ) is 100–250 m thick and characterized by the mixture of argillaceous sandstone, silty mudstone, muddy limestone, calcareous mudstone, and calcareous sandstone (Fu et al, 2019; Yuan et al, 2002). These lithological sets, typical of lacustrine facies deposits, are widely distributed in the basin.…”

Section: Geological Settingsmentioning

confidence: 99%

“…Source rocks are the material factors that control petroleum generation and accumulation; furthermore, they are prerequisites in hydrocarbon exploration and prospect appraisal (Ghassal et al, 2018; Hakimi & Abdullah, 2014; Hu et al, 2018; Jia, Zou, Li, Li, & Zheng, 2012; Katz, 2001; Katz, 2005; Ndip, Agyingi, Nton, Hower, & Oladunjoye, 2019), especially for unconventional resources, which are mainly retained within the source rock (Chen & Osadetz, 2013; Ehsan, Gu, Akhtar, Abbasi, & Ullah, 2018; Fu, Yan, Meng, & Liu, 2019; Jarvie, Hill, Ruble, & Pollastro, 2007; Katz & Lin, 2014; Kumar et al, 2017; Li et al, 2019; Liu et al, 2020; Ndip et al, 2019; Schmoker, 2002; Zou et al, 2019). Tight oil is an unconventional resource produced from source rocks and stored in tight sandstone, carbonate, and mixed rocks reservoirs that are adjacent to source rocks (Cao et al, 2017; Hu et al, 2018; Jia et al, 2012; Li et al, 2015; Liu et al, 2019; Smith & Bustin, 2000).…”

Section: Introductionmentioning

confidence: 99%

The hydrocarbon generation and expulsion features of source rocks and tight oil potential of the second member of the Qiketai Formation, Shengbei area in the Turpan–Hami Basin, NW China

et al. 2020

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Significant progress in tight oil exploration has been reported in the second member of the Qiketai Formation (J2q2) in the Shengbei area of the Turpan–Hami Basin. Geochemical analyses were conducted to assess the quality of the J2q2 source rocks. The improved hydrocarbon generation potential method was utilized to quantify the hydrocarbon generation and expulsion features of the source rocks. The results showed that J2q2 source rocks were deposited in a reduced lacustrine setting with a high palaeoproductivity. The J2q2 source rocks are widely distributed (approximately 1,000 km2) and have a thickness that varies from 50 to 130 m. Moreover, they can be identified as a set of high‐quality source rocks (thermally mature rocks with Ro values >0.5%, consisting mainly of types I and II kerogen and possessing an average total organic carbon content of 2.68%). The oil–source correlation results reveal that the source of crude oil in the studied area is J2q2. The improved hydrocarbon generation potential method is established for different kerogen types to limit the influence of the kerogen type on the calculation. The hydrocarbon expulsion threshold of the type I model is located at Ro = 0.6%. The type II kerogen rocks have different characteristics, and the hydrocarbon expulsion threshold is located at Ro = 0.62%. The maximum hydrocarbon generation and expulsion intensities are 700 × 104 t/km2 and 400 × 104 t/km2, respectively. The hydrocarbon generation and expulsion amount of the J2q2 source rocks are 21.4 × 108 t and 12.3 × 108 t, respectively. The tight oil potential of the J2q2 tight oil in the Shengbei area is 4.09 × 108 t. The SB10 and SB6 well areas are favourable J2q2 tight oil exploration areas in the Shengbei area. The SB10 well area has the highest hydrocarbon generation and expulsion intensities in the study area and is the best tight oil exploration target.

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Evolution of disintegration breakage of upper cretaceous red-bed mudstone in an acidic environment based on the Weibull model

Zhang

Ling

2023

Acta Geotech.

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Deformation Mechanism and Vertical Sealing Capacity of Fault in the Mudstone Caprock

Cited by 25 publications

References 43 publications

Method for Evaluating Fault Hydraulic Conductive Property and Its Application in Shandong, China

Method for Evaluating Fault Hydraulic Conductive Property and Its Application in Shandong, China

The hydrocarbon generation and expulsion features of source rocks and tight oil potential of the second member of the Qiketai Formation, Shengbei area in the Turpan–Hami Basin, NW China

Evolution of disintegration breakage of upper cretaceous red-bed mudstone in an acidic environment based on the Weibull model

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