Geomechanical simulation of low-order fracture of tight sandstone

Yin, Shuai; Wu, Zhonghu

doi:10.1016/j.marpetgeo.2020.104359

Cited by 50 publications

(31 citation statements)

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“…By studying the correlation between the porosity and permeability of the Yan'an Formation sandstone in the study area (Figure 6), it is found that the permeability increases with the increase in porosity, and they have a good positive exponential correlation. The permeability of some data exceeds 100 mD, indicating that some microfractures have developed in these samples (Rezaee, Saeedi, & Clennell, 2012;Yin & Wu, 2020). These data are overburden permeability.…”

Section: Reservoir Petrophysical Characteristicsmentioning

confidence: 87%

“…Therefore, some dissolution pores are usually developed on the siliceous cement, which reflects a relatively acidic deposition environment. Moreover, the structural uplift will cause the temperature and pressure inside the reservoir to decrease, and the saturation of SiO 2 will decrease as well, which in turn will also lead to the precipitation of SiO 2 (Ding et al, 2021;Yin & Wu, 2020).…”

Section: Siliceous Cementmentioning

confidence: 99%

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Diagenesis and reservoir classification criteria for Jurassic continental sandstone oil reservoir in the western Ordos Basin, China

Wei

Chen

et al. 2021

Geological Journal

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The marginal area of a sedimentary basin is closer to the provenance, so the sand body is generally more developed. For the Western Margin Thrust Belt of the Ordos Basin, the quality of the Jurassic sandstone reservoirs is still less studied. Diagenesis and reservoir evaluation are important research contents and hotspots in sedimentary geology. Therefore, in this paper, the diagenesis and reservoir properties of the Jurassic Yan 6 to Yan 10 members (Yan'an Formation) have been systematically studied based on the latest 3D seismic, well logging, cast thin section, scanning electron microscope and petrophysical property tests in this area. Furthermore, the vertical heterogeneity of petrophysical properties of the Jurassic reservoir has been discussed in detail, and the diagenetic evolution sequence and classification criteria of Jurassic sandstone reservoir have been proposed. The research results show that the lithologies of the Yan 6 to Yan 10 members are mainly lithic quartz sandstone, lithic feldspar sandstone and feldspar lithic sandstone. The pore types of sandstone are mainly intergranular pores, followed by dissolution pores, intercrystalline pores and a few microfractures. There are two high-value porosity zones in the buried depths of 1,950-2,050 m and 2,150-2,250 m, which are the coupling results of dissolution and palaeo-overpressure. Based on the comprehensive study of petrology, petrophysical properties and diagenesis, the diagenetic evolution sequence of the Jurassic sandstone was restored and a comprehensive classification standard for the Jurassic sandstone reservoirs is proposed. The Jurassic reservoir in the study area is a structurallithological reservoir, which has a unified oil-water interface, the Type I and Type II reservoir areas in the structural high positions are conducive to the large-scale accumulation of hydrocarbons.

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Section: Reservoir Petrophysical Characteristicsmentioning

confidence: 87%

Section: Siliceous Cementmentioning

confidence: 99%

Diagenesis and reservoir classification criteria for Jurassic continental sandstone oil reservoir in the western Ordos Basin, China

Wei

Chen

et al. 2021

Geological Journal

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“…The cores of the Ma 5 member from 19 wells were observed for fracture analysis, and the accumulative length of the cores studied is up to 231.21 m. Distribution patterns and development degrees of macroscopic fractures are observed on these core materials. Then, the occurrence, opening degree, intersect relationship, density, filling degree, and porosity of fractures are obtained following procedure and methods employed elsewhere (Laubach, 1997; Yin & Wu, 2020; Zhang et al, 2018).…”

Section: Materials and Analytical Methodsmentioning

confidence: 99%

Characteristics, influencing factors, and prediction of fractures in weathered crust karst reservoirs: A case study of the Ordovician Majiagou Formation in the Daniudi Gas Field, Ordos Basin, China

Xie

Zhou

Zhang³

et al. 2020

Geological Journal

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The study of fractures in karst reservoirs is a hot spot in the field of geosciences. In this article, we conducted a systematic study on the characteristics, influencing factors, and prediction methods of karst reservoir fractures of the Ordovician Majiagou Formation in the Daniudi Gas Field, China. Both weathering and tectonic fractures are mainly developed in the Ma 5 member of the Majiagou Formation. The former is categorized into surface weathering, steep wall tensile and karst collapse fractures, and the latter is made of tensile and shear fractures. The palaeo-temperatures of the fracture filling inclusions range from 90 to 140 C, peaking at 111-120 C, which are derived from oxygen isotopes of −7.9 to −17.5‰, with average −14.1‰ from the same filling inclusions. Integrations of regional tectonic activities, inclusion tests, and stable isotope analysis recognizes four formation periods of fractures since the Caledonian. The factors controlling the development degree of the karst reservoir fractures include lithology, petrophysical properties, rock layer thickness, structural deformation strength, and karst palaeomorphology. The buckling thin plate simulation results show a good positive correlation between the maximum principal stress and tensile fracture density. The same positive correlation is also observed between the shear stress and fracture density. The ancient karst landforms have strongly affected the distribution of weathering fractures. Surficial weathering fractures occur typically in the weathered residual monadnocks, while steep wall tension ruptures in areas near geomorphic steep ridges, and karst collapse fractures in karst residual monadnocks and karst pit areas.

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“…For tight sandstone, when the fracture linear density is less than 0.2 per metre, it is generally considered that the fracture is not developed (Yin & Wu, 2020). According to the fitting results in Figure 9, it can be found that when the thickness of a single layer is greater than 15 m, the degree of fracture development is generally less than 0.2 per metre, and the fractures are less developed.…”

Section: Rock Layer Thicknessmentioning

confidence: 99%

Development mode of reverse fault‐associated fractures in deep tight sandstones: A case study in Xinchang Gas Field, Sichuan Basin, China

et al. 2021

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Evaluation of natural fractures is the key issue of the prediction of sweet spots in deep tight sandstones. In this article, taking the tight gas sandstone reservoir of the Xu 2 Member (second member of the Upper Triassic Xujiahe Formation) in Xinchang Gas Field, West Sichuan Depression as an example, we systematically studied the characteristics, formation periods, influencing factors, and developmental mode of fractures using testing results of cores, thin sections, rock mechanics, isotopes, fluid inclusions, and the structural curvature simulation method. The results show that the Xu 2 Member mainly develops vertical and high-angle fractures. The fractures are highly effective and mainly developed in medium-fine-grained sandstone. The secondary minerals in the fractures have multi-stage filling processes. The fluid inclusions are mainly gas-liquid two-phase brine inclusions (secondary inclusions), and with the same crystal, the temperature difference between the brine inclusion and the organic inclusion is 23.7 C. Carbon and oxygen stable isotope tests show that calcite has two mixing stages. In the end, the formation periods of the fractures in the Xu 2 Member were divided into five stages. The influencing factors of fractures in the Xu 2 Member include lithology, fault, layer thickness, and structural deformation. According to geomechanical analysis, we finally established the development mode of reverse fault-associated fractures in the Xu 2 Member.

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Geomechanical simulation of low-order fracture of tight sandstone

Cited by 50 publications

References 50 publications

Diagenesis and reservoir classification criteria for Jurassic continental sandstone oil reservoir in the western Ordos Basin, China

Diagenesis and reservoir classification criteria for Jurassic continental sandstone oil reservoir in the western Ordos Basin, China

Characteristics, influencing factors, and prediction of fractures in weathered crust karst reservoirs: A case study of the Ordovician Majiagou Formation in the Daniudi Gas Field, Ordos Basin, China

Development mode of reverse fault‐associated fractures in deep tight sandstones: A case study in Xinchang Gas Field, Sichuan Basin, China

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