Defining stratigraphic oil and gas plays by modifying structural plays: A case study from the Xihu Sag, east China Sea Shelf Basin

Dong, Feng; Xie, Chengrong; Zhou, Xinghai; Jiang, Cen; Li, Kun; Wan, Lifeng; Zhang, Pei; Niu, Huawei

doi:10.1016/j.engeos.2020.08.002

Cited by 18 publications

(9 citation statements)

References 15 publications

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“…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%

“…continuous progress of various energy technologies, reservoir sedimentology has gradually developed from macro to micro areas (Atkinson & Meredith, 1987;Ju et al, 2017;Ju, Wang, Hou, Sun, & Yu, 2018;Yoshida & Santosh, 2020;Zheng, Zhang, & Qi, 2020). The microscopic properties of oil and gas reservoir and its evolution mechanism are a hot topic in this subject (Ding et al, 2021;Fu, Yang, He, Xu, & Lin, 2016;Ju, Yang, Qin, Yi, & Zhang, 2018;Zhao, Guo, Chong, Li, & Wang, 2019). The ultimate goal of reservoir sedimentology is to predict the favourable 'sweet spot' of the reservoir (Santosh & Feng, 2020;Xi et al, 2016).…”

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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: Siliceous Cementmentioning

confidence: 99%

mentioning

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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“…13−16 Earlier research has identified two key factors that affect SG preservation: the temporal and spatial match between tectonic movements and the hydrocarbon (HC) generation stage after the formation of a shale bed, as well as the damage caused by the faults that form from intense tectonic movements to the roof and floor of the shale bed. 17−25 Assessment of the preservation conditions in a formation has been primarily centered on factors such as fault development and sealing capacity, the time and extent of uplifts, 26,27 and the integrity of the roof and floor. In addition, according to the degree of influence of different factors, the corresponding preservation assessment systems have been established.…”

Section: Introductionmentioning

confidence: 99%

“…These differences also hinder the exploration and efficient development of SG. Various methods for assessing the preservation of SG are currently available. − Earlier research has identified two key factors that affect SG preservation: the temporal and spatial match between tectonic movements and the hydrocarbon (HC) generation stage after the formation of a shale bed, as well as the damage caused by the faults that form from intense tectonic movements to the roof and floor of the shale bed. − Assessment of the preservation conditions in a formation has been primarily centered on factors such as fault development and sealing capacity, the time and extent of uplifts, , and the integrity of the roof and floor. In addition, according to the degree of influence of different factors, the corresponding preservation assessment systems have been established. , Tang evaluated the preservation conditions of the Longmaxi Formation marine shale in the southeastern Sichuan Basin by assigning values to factors such as roof and floor conditions, structural locations, fracture development, fracture spacing, and stratum thickness.…”

Section: Introductionmentioning

confidence: 99%

Composition of Formation Water and Natural Gas as an Indicator of Shale Gas Preservation Conditions: A Case Study of the Marine Shale of the Niutitang Formation in the Cengong Block in Northern Guizhou, China

Wang

et al. 2022

ACS Omega

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Shale gas (SG) wells in the Wufeng–Longmaxi Formation in northern Guizhou differ considerably in their production capacities. Preservation conditions are a crucial factor affecting the formation of SG reservoirs. In this study, the formation water (FW) in four wells in northern Guizhou was analyzed to determine the type; the Cl/Mg, Ca/Mg, and Na/Cl coefficients (C Cl/Mg, C Ca/Mg, and C Na/Cl, respectively), and the coefficient of desulfurization (C d); the SG in these wells was tested to identify its composition and the sources of its components. The results show the following: wells TX1 and CY1 contain two types (CaCl2 and NaHCO3) of FW, each with low C Na/Cl, low C d, high C Ca/Mg, and high C Cl/Mg, suggesting a high level of FW retention. The FW in wells TM1 and CD1 is of NaHCO3 type and is characterized by high C Na/Cl, high C d, low C Ca/Mg, and low C Cl/Mg, indicating a high level of connectivity between the FW and surface water. Nonhydrocarbon gases account for a high proportion of SG in composition; with a 15N value between −8.7 and −4.2‰, N2 accounts for approximately 20% of SG in wells TX1 and CY1, respectively. This result indicates the ammonification of organic matter (OM) during pyrolysis and hydrocarbon generation as sources of N2. In contrast, with a 15N value between −3.6 and 0‰, N2 accounts for over 70% of SG in wells TM1 and CD1, respectively, indicating the atmosphere, the ammonification of OM, and the presence of poor preservation conditions due to a high level of connectivity between the shale bed and the atmosphere acted as the sources of N2. The metamorphism coefficients of FW in conjunction with the SG composition and the sources of nonhydrocarbon gases can serve as auxiliary indicators of the quality of SG preservation conditions.

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“…At present, the exploration and development of continental tight sandstone oil has achieved great success in China (Zou et al, 2013;Yin et al, 2018;Li et al, 2020). The development of continental tight sandstone oil is difficult, which puts forward higher requirements for the integration technology of geology and engineering of tight oil (Li et al, 2018;Hong et al, 2020;Abouzar and Ghanbarian, 2021;Ding et al, 2021). The integrated construction of tight oil geology and engineering is to maximize the stable production of crude oil.…”

Section: Introductionmentioning

confidence: 99%

Simulation of Fracturing and Well Pattern Optimization of Fractured Tight Sandstone Reservoirs

et al. 2022

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The fracturing and well pattern optimization of fractured reservoirs is a hot spot in petroleum engineering. In this study, taking the tight oil reservoirs of the Yanchang Formation in the Ordos Basin as an example, an optimized plan of hydraulic fracturing and well pattern deployment of the fractured tight reservoir were systematically studied using a fluid-solid coupling model. The results show that the Chang 6 Member of Yanchang Formation mainly develop feldspar sandstone. A large number of vertical fractures are developed in Chang 6 Member, and they have significant shearing properties. The target sandstone reservoir is in the mid-diagenetic A stage. Natural fractures have a significant effect on the extension of hydraulic fractures. When the fracturing direction is parallel to the main strike of natural fractures, the extension distance of the hydraulic fractures is long and the fracturing scale is large; however, when the fracturing direction is orthogonal or oblique to the main strike of natural fractures, the extension distance of the hydraulic fractures is limited. Statistics show that the average length of hydraulic fractures when fracturing parallel to natural fractures is 1.3 times of that when fracturing perpendicular to natural fractures. In addition, after optimization of fracturing parameters, we found that the displacement should be controlled at 2–3 cubic meters/min, and the sand ratio should be controlled at 25%. The smaller the horizontal minimum principal stress difference between the fracturing layer and the shielding layer, the lower the elastic modulus, and the easier it is to control the fracture height. Microseismic monitoring results show that the half-fracture length and fracture height are mainly distributed in 80–140 m and 15–25 m, respectively. The optimized fracture half-length was 120 m and the half-fracture height was 20 m. Finally, the well pattern of the target layer is optimized considering natural fractures. Through this study, we found that the reverse five-spot well pattern is suitable for the efficient development of tight oil reservoirs of the Chang 6 Member in this area.

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Defining stratigraphic oil and gas plays by modifying structural plays: A case study from the Xihu Sag, east China Sea Shelf Basin

Cited by 18 publications

References 15 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

Composition of Formation Water and Natural Gas as an Indicator of Shale Gas Preservation Conditions: A Case Study of the Marine Shale of the Niutitang Formation in the Cengong Block in Northern Guizhou, China

Simulation of Fracturing and Well Pattern Optimization of Fractured Tight Sandstone Reservoirs

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