Fine characterization of lithofacies and pore network structure of continental shale: Case study of the Shuinan Formation in the north Jiaolai Basin, China

Wang, Meng; Xie, Weidong; Huang, Kai; Dai, Xiaogan

doi:10.1016/j.petrol.2019.01.011

Cited by 24 publications

(12 citation statements)

References 11 publications

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“…The palaeosalinity of the water then decreased until the water in the Qugezhuang Formation became freshwater (Figure 4). This contradicts previous opinion regarding the typical lacustrine sedimentary strata in the Laiyang Group of Jiaolai Basin (Li & Zhang, 2001; Wang et al, 2019; Zhou et al, 2016). The Shuinan and Wawukuang formations are considered to be of marine characteristics based on geochemical indicators (Feng et al, 2018), but only indicating that their sedimentary water body has high palaeosalinity, and no comprehensive analysis of palaeontology, palaeoclimatology, and sedimentology has been further carried out.…”

Section: Resultscontrasting

confidence: 78%

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Terrestrial expression of the Cretaceous greenhouse regime and its relationship withOAE1a: Evidence from the Jiaolai Basin, eastern China

Zhang

Yin

2020

Geological Journal

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Important geological events that influenced the global environment occurred during the mid‐Cretaceous period. Dramatically increasing temperatures not only triggered oceanic anoxic events (OAEs) but also led to the aridity of terrestrial environments in East Asia. This study provides evidence for the aridity of a terrestrial East Asian environment during the mid‐Cretaceous and provides an example of the influence of the Cretaceous greenhouse climate on a terrestrial lake system in correspondence with the OAE 1a event. Palaeosalinity indexes (B, B/Ga, Sr/Ba, and Couch's palaeosalinity) and palaeoclimate proxies (Sr/Cu, Rb/Sr, Al2O3/MgO, and clay mineral compositions) of shale and mudstone from the Laiyang Group of the Jiaolai Basin in Eastern China were analysed. The results demonstrate that the palaeoclimate in the Wawukuang Formation was relatively warm and humid but became extremely dry and hot in the Shuinan Formation during the OAE 1a event before becoming warm and humid again in the Longwangzhuang and Qugezhuang formations. As a result, the palaeosalinity of the Jiaolai Basin increased from 4% in the Wawukuang Formation to 30% in the Shuinan Formation before decreasing to 0.48% in the Longwangzhuang and Qugezhuang formations. The following conclusions are from combining the distributional characteristics of the saliferous strata and its palaeontology, the palaeogeographic background, and the aeolian sandstone in eastern China. (a) The East Asian continental margin was influenced by the Cretaceous greenhouse climate, which resulted in the salinization of the Jiaolai Basin. (b) The significant increase of the palaeosalinity in the Shuinan Formation was an effect of the OAE 1a event on the terrestrial lake system, which further suggests the OAE 1a event was global. (c) Influences of the hothouse climate on the continental lakes changed the palaeosalinity of the water bodies.

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Section: Resultscontrasting

confidence: 78%

“…The Lower Cretaceous Laiyang Group in the Jiaolai Basin comprises a set of typical fluvio‐lacustrine facies strata (Li et al, 2019; Li & Zhang, 2001; Wang, Xie, Huang, & Dai, 2019; Zhou et al, 2016). Conglomerates and coarse sandstone of the basal Wawukuang Formation may represent the sedimentation of an alluvial fan setting.…”

Section: Geological Settingmentioning

confidence: 99%

Terrestrial expression of the Cretaceous greenhouse regime and its relationship withOAE1a: Evidence from the Jiaolai Basin, eastern China

Zhang

Yin

2020

Geological Journal

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“…In this investigation, we combined a mathematical simulation and experimental simulation. Huang 1)) is the most widely accepted method for the fitting of CH 4 adsorption behavior [15,28,29]. According to the perspective of adsorption kinetics, Langmuir (1916) proposed that gas molecules were mainly adsorbed by monolayer adsorption, with the following assumptions [30]:…”

Section: Langmuir Fitting Modelmentioning

confidence: 99%

“…This suggests that the porous structure formed when the organic matter evolved to over-maturity; namely, after reaching the peak of gas generation, the adsorption capacity of shale was dominated by TOC. However, Wang et al (2019) revealed that organic pores did not experience favorable development in scanning electron microscope pictures [15], which implies that, when determining the maturity of a shale gas reservoir, attention should also be paid to the selection of shale gas. In addition to organic matter pores, intergranular pores, intragranular pores and microfissures are also significant contributors.…”

Section: The Impact Of Toc and Mineral Composition On V Lmentioning

confidence: 99%

“…Ross et al (2009) and Zhou et al (2019) concluded that organic pores and structures have high affinity to CH 4 , as their complex pore structure and huge internal surface area entail a strong gas storage capacity [10,11]; Gasparik et al (2014) and Jin et al (2014) demonstrated that the interlayers of smectite, mixed I/S and other clay minerals develop with a mass internal surface area, which is another significant occurrence space [12,13]. The adsorption of CH 4 on shale is a physical adsorption process, which is mainly controlled by the intermolecular force, including the London dispersion force, Debye force and Keesom force, also known as the van der Waals force [14,15]. Xiong et al (2017), Xu et al (2019) and Zou et al (2019) reported on the gas adsorption in shale controlled by temperature and pressure and found that adsorption capacity increases with the growth of pressure while decreasing with the growth of temperature [16][17][18]; Chalmers et al (2012), Fu et al (2015) and Sun et al (2018) suggested that total organic carbon (TOC) is the dominant controlling factor of adsorption capacity; in particular, in the micro and nano-pore structures of organic matter, CH 4 molecules are adsorbed on the pore surface and are free in the pore center, where is a linear positive correlation of the gas adsorption capacity with the TOC value [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

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Adsorption Characteristics and Controlling Factors of CH4 on Coal-Measure Shale, Hedong Coalfield

2021

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Adsorbed gas is one of the crucial occurrences in shale gas reservoirs; thus, it is of great significance to ascertain the adsorption capacity of shale and the adsorption characteristics of CH4. In this investigation, the Taiyuan–Shanxi Formations’ coal-measure shale gas reservoir of the Carboniferous–Permian era in the Hedong Coalfield was treated as the research target. Our results exhibit that the shale samples were characterized by a high total organic carbon (TOC) and over to high-over maturity, with an average TOC of 2.45% and average Ro of 2.59%. The mineral composition was dominated by clay (62% on average) and quartz (22.45% on average), and clay was mainly composed of kaolinite and illite. The Langmuir model showed a perfect fitting degree to the experimental data: VL was in the range of 0.01 cm3/g to 0.77 cm3/g and PL was in the range of 0.23–8.58 MPa. In addition, the fitting degree depicted a linear negative correlation versus TOC, while mineral composition did not exhibit a significant effect on the fitting degree, which was caused by the complex pore structure of organic matter, and the applicability of the monolayer adsorption theory was lower than that of CH4 adsorption on the mineral’s pore surface. An apparent linear positive correlation of VL versus the TOC value was recorded; furthermore, the normalized VL increased with the growth of the total content of clay mineral (TCCM), decreased with the growth of the total content of brittle mineral (TCBM), while there was no obvious correlation of normalized VL versus kaolinite, illite and quartz content. The huge amount of micropores and complex internal structure led to organic matter possessing a strong adsorption capacity for CH4, and clay minerals also promoted adsorption due to the development of interlayer pores and intergranular pores.

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A New Thermal Conductivity Estimation Model for Sandstone and Mudstone Based on Their Mineral Composition

Jiang

Fang

et al. 2021

Pure Appl. Geophys.

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Fine characterization of lithofacies and pore network structure of continental shale: Case study of the Shuinan Formation in the north Jiaolai Basin, China

Cited by 24 publications

References 11 publications

Terrestrial expression of the Cretaceous greenhouse regime and its relationship withOAE1a: Evidence from the Jiaolai Basin, eastern China

Terrestrial expression of the Cretaceous greenhouse regime and its relationship withOAE1a: Evidence from the Jiaolai Basin, eastern China

Adsorption Characteristics and Controlling Factors of CH4 on Coal-Measure Shale, Hedong Coalfield

A New Thermal Conductivity Estimation Model for Sandstone and Mudstone Based on Their Mineral Composition

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