Pore structures of shale cores in different tectonic locations in the complex tectonic region: A case study of the Niutitang Formation in Northern Guizhou, Southwest China

Sun, Wenjibin; Zuo, Yujun; Wang, Shanyong; Wu, Zhonghu; Liu, Hao; Zheng, Lujing; Lou, Yili

doi:10.1016/j.jngse.2020.103398

Cited by 23 publications

(27 citation statements)

References 42 publications

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“…The Niutitang Formation can be roughly divided into three sections: (i) the lower section is black shale with a thin layer of silty limestone, which is a nontypical carbonate deposit at the early stage of transgression; (ii) the middle section is gray-black and black carbonaceous shale, [4]). Due to the existence of Sichuan Basin margin, the ancient burial depth of the Niutitang shale distributed in its periphery was only 6200 m. 10 Geofluids deposited on the outer shelf as a result of extensive transgression; and (iii) the upper section is micritic limestone which is deposited on the open platform at the high stage of transgression [2,5,6]. The shale with TOC ≥ 2:0% is mainly developed in the middle section of the Niutitang Formation, but with thickness variations from 9 m to 140 m [23].…”

Section: Geofluidsmentioning

confidence: 99%

“…The Eq-R o of the Niutitang shale in Southern Guizhou is generally below 3.0%, with an average value of 2.4% [46,47]. Minerals of the Niutitang shale in Southern Guizhou are also dominated by quartz, clay, and carbonate [10,11].…”

Section: Geofluidsmentioning

confidence: 99%

“…According to the regional structure pattern of Jingyan, Yichang, and Guizhou, the underlying structures of the Niutitang shale are all paleouplift structures, and the target shale is distributed in the slope belt of the paleouplift [2,4,26,33]. Due to the existence of the paleouplift, the maximum ancient burial depth of the Niutitang shale in Jingyan, Yichang, and Guizhou is about 6000 meters [2,4,5,10], and the burial depth of the shale is moderate, avoiding excessive evolution and leaving a large number of OM pores in the shale reservoir [1,16]. In contrast, in the Chongqing area, due to the absence of the paleouplift structure, the maximum ancient burial depth of the Niutitang shale in this area reached 8000 meters [26], and the shale reservoir experienced excessive thermal evolution, resulting in the disappearance of a large number of OM pores, and a large volume of gas was lost due to the absence of effective storage spaces in the reservoir [49,52,53].…”

Section: Geofluidsmentioning

confidence: 99%

“…Successful exploration and development of the Niutitang shale has also been made in Southern Guizhou (south China), where commercial gas has been successfully produced from the HY1 well [9,10]. The HY1 well has a gas content of 1.3 m 3 /t [11].…”

Section: Introductionmentioning

confidence: 99%

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Slope Belts of Paleouplifts Control the Pore Structure of Organic Matter of Marine Shale: A Comparative Study of Lower Cambrian Rocks in the Sichuan Basin

et al. 2021

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Extensive exploration of the marine shale of the Niutitang Formation in south China has been conducted. However, exploration and development results have varied considerably in different areas. For example, the Niutitang shale in Jingyan City (Southwestern Sichuan Basin) produces a large amount of gas with a long period of stable production. In contrast, most development wells in the Niutitang shale in Chongqing City do not produce gas. Scanning electron microscopy images showed that the organic matter (OM) pore development in the Niutitang shale in Jingyan is abundant, large in size, and are well connected. In contrast, OM pores in the Niutitang shale in Chongqing are rarely observed. OM pore development of the Jingyan and Chongqing shales is mainly controlled by thermal maturity as shown by equivalent vitrine reflectance determinations. The moderate thermal maturity has resulted in the development of a large number of OM pores in the Niutitang shale in Jingyan, whereas the high thermal maturity of the Niutitang shale in Chongqing has led to the destruction of most of the OM pores. Due to the existence of ancient uplift, the shale was buried shallowly in the process of hydrocarbon generation evolution, and the shale avoided excessive thermal evolution and retained appropriate thermal maturity. In the Jingyan area, due to its location near the central uplift in the Sichuan Basin, the Niutitang shale deposited nearby avoided excessive evolution, and a large number of OM pores were retained in the reservoir.

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Section: Geofluidsmentioning

confidence: 99%

Section: Geofluidsmentioning

confidence: 99%

Section: Geofluidsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Slope Belts of Paleouplifts Control the Pore Structure of Organic Matter of Marine Shale: A Comparative Study of Lower Cambrian Rocks in the Sichuan Basin

et al. 2021

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“…, c r and ϕ r . The mechanical parameters can be obtained from concrete tests [46][47][48]. σ 1 r can be obtained from Equation (14).…”

Section: Parameter Determination Of the Statistical Damage Constitutimentioning

confidence: 99%

The Statistical Damage Constitutive Model of the Mechanical Properties of Alkali-Resistant Glass Fiber Reinforced Concrete

2020

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Alkali-resistant glass fiber reinforced concrete (AR-GFRC) has greatly improved in terms of tensile strength, toughness, durability, and reduction of cracking, which has been proven by testing. However, the constitutive relationship of fiber reinforced concrete under complicated stress represents a complex theoretical problem. In order to investigate the microscopic damage evolution and failure mechanism of AR-GFRC, the meso-statistical damage theory, microcontinuum theory, and composite material theory were considered, and uniaxial tensile tests of two types of AR-GFRC were conducted. A new damage variable expression of the AR-GFRC was proposed, and the stress-strain curve was redefined by considering the residual strength based on experimental fitting parameters and statistical parameters. A Weibull distribution was assumed and a statistical damage constitutive model was developed of the deformation process of the AR-GFRC while considering the residual strength effect; detailed calculation methods to determine the mechanical and statistical parameters of the concrete were developed. The validation results show that the theoretical stress-strain curve of the constitutive model is in good agreement with the experimental curve and the trend is consistent.

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Evolution Mechanism of Pore Structures of Organic-Rich Shale Under Tectonic Deformation: A Comparative Study Between Whole Rock and Kerogen Samples

Cheng,

Jiang,

et al. 2023

Nat Resour Res

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Pore structures of shale cores in different tectonic locations in the complex tectonic region: A case study of the Niutitang Formation in Northern Guizhou, Southwest China

Cited by 23 publications

References 42 publications

Slope Belts of Paleouplifts Control the Pore Structure of Organic Matter of Marine Shale: A Comparative Study of Lower Cambrian Rocks in the Sichuan Basin

Slope Belts of Paleouplifts Control the Pore Structure of Organic Matter of Marine Shale: A Comparative Study of Lower Cambrian Rocks in the Sichuan Basin

The Statistical Damage Constitutive Model of the Mechanical Properties of Alkali-Resistant Glass Fiber Reinforced Concrete

Evolution Mechanism of Pore Structures of Organic-Rich Shale Under Tectonic Deformation: A Comparative Study Between Whole Rock and Kerogen Samples

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