Identification and characteristic analysis of carbonate cap rock: A case study from the Lower-Middle Ordovician Yingshan Formation in Tahe oilfield, Tarim Basin, China

Wu, Jun; Tang, Fan; Gao, Zhiqian; Gu, Yu; Wang, Jiabei; Du, Yang; Li, Chen; Wang, Shanshan; Zhang, Chenjia; Meng, Ming; Wei, Duan; Fan, Hua

doi:10.1016/j.petrol.2017.12.070

Cited by 19 publications

(20 citation statements)

References 22 publications

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“…The study is based on detailed observations of 106.5 m of drill core from 15 wells, 105 core samples and 356 core pictures. The selected samples are all carbonate cap rocks because they can be identified using well data and drill core, fullbore microscan imaging (FMI), combination core and FMI, combination of core and wireline log, and seismic profiles (Wu et al, 2018a). These samples were studied using a series of analytical techniques, including the combination of MICP and N2GA methods, thinsection optical and electronic microscope petrography, porosity and permeability tests and fractal dimension calculations.…”

Section: Samples and Methodsmentioning

confidence: 99%

“…In addition, the details of the drilling processes, well completion records and daily production data provided by the Northwest Oilfield Branch of SINOPEC were also used in our analysis. Wu et al, 2018aWu et al, , 2018b.…”

Section: Samples and Methodsmentioning

confidence: 99%

“…1C) (Kang, 2005). The Yingshan Fm (O1-2y) is composed of four members (1 st , 2 nd , 3 rd and 4 th members) from bottom to top (Wu et al, 2018a). The depositional environments of this formation gradually evolved from a restricted carbonate platform (1 st and 2 nd members) to an open carbonate platform (3 rd and 4 th members) (Wu et al, 2018b).…”

Section: Geological Settingmentioning

confidence: 99%

“…There are extensive studies of cap rocks composed of mudstone, shale and gypsum (Caillet, 1993;Armitage et al, 2010;Boulin et al, 2013;Corrado et al, 2014;Huq et al, 2017;Newell et al, 2017;Liu et al, 2017), but investigations on carbonate cap rocks are less abundant and have only started in recent years. Most of the few existing studies mainly focus on the identification and quantitative characterization of the carbonate cap rock (Lü et al, 2017;Wu et al, 2018a). In carbonate reservoirs, the rock heterogeneity and pore network geometry control the sealing capacity of the rock.…”

Section: Introductionmentioning

confidence: 99%

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Impact of pore structure and fractal characteristics on the sealing capacity of Ordovician carbonate cap rock in the Tarim Basin, China

Tang

Gomez‐Rivas

et al. 2019

Marine and Petroleum Geology

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：Evaluating the heterogeneity and sealing capacity of carbonate cap rocks is of great significance for hydrocarbon production. However, the main controls on pore size distribution in carbonate cap rocks are not well constrained. In this contribution we analyze drill core samples of carbonate cap rocks from the Ordovician Yingshan Formation (Tarim Basin) to study their pore properties and investigate the controls of pore-throat structure and fractal dimension on the sealing capacity of the cap rock. Results from petrography and a combination of mercury injection capillary pressure and nitrogen gas adsorption tests reveal that there are four lithological cap rock types, with micrite being the most prevalent one, followed by calcarenite. Six types of pore-throat structures and fractal dimensions (from D 1 to D 6 ) are classified based on the pore size distributions, including macropore-I, macropore-II, mesopore-I, mesopore-II, transitional pore-I and transitional pore-II. The fractal dimensions show that there is a decreasing trend from D 1 to D 6 with decreasing pore-size diameter, suggesting that the macropore and mesopore types present more complex pore-throat structures than the transitional type. The total fractal dimension (D total ) indicates that the pore throat structures are complex and heterogeneous. The sealing heights of the gas column have a positive correlation with cement content in calcarenite and a negative correlation with microfracture density. Mesopore-II and transitional pore types make a significant contribution to enhancing the breakthrough pressure. The fractal variations mainly result from macropores and mesopores, while transitional pores and micropores weaken the impact of the whole pore system on the D total value. The heterogeneity and anisotropy of macropores is the main control on the sealing capacity of the cap rock. The increasing of D 1 considerably contributes to the pore shape heterogeneity and enhances the capillary resistance force to hydrocarbon migration. Therefore, the fractal dimension is an effective approach for investigating the pore throat structure and sealing capacity of carbonate cap rocks.

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Section: Samples and Methodsmentioning

confidence: 99%

Section: Samples and Methodsmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Impact of pore structure and fractal characteristics on the sealing capacity of Ordovician carbonate cap rock in the Tarim Basin, China

Tang

Gomez‐Rivas

et al. 2019

Marine and Petroleum Geology

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“…Block 9 Tahe oil field is in the territory of Tabei Uplift within the Tarim Basin of north western China [38]. It was discovered in 2002 by drilling wells S95 and S100.…”

Section: Study Areamentioning

confidence: 99%

Optimized Random Vector Functional Link network to predict oil production from Tahe oil field in China

Alalimi

Pan

Al-qaness

et al. 2020

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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In China, Tahe Triassic oil field block 9 reservoir was discovered in 2002 by drilling wells S95 and S100. The distribution of the reservoir sand body is not clear. Therefore, it is necessary to study and to predict oil production from this oil field. In this study, we propose an improved Random Vector Functional Link (RVFL) network to predict oil production from Tahe oil field in China. The Spherical Search Optimizer (SSO) is applied to optimize the RVFL and to enhance its performance, where SSO works as a local search method that improved the parameters of the RVFL. We used a historical dataset of this oil field from 2002 to 2014 collected by a local partner. Our proposed model, called SSO-RVFL, has been evaluated with extensive comparisons to several optimization methods. The outcomes showed that, SSO-RVFL achieved accurate predictions and the SSO outperformed several optimization methods.

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The application of N2 huff and puff for IOR in fracture-vuggy carbonate reservoir

Yue

Xie

Huang

et al. 2018

Fuel

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Identification and characteristic analysis of carbonate cap rock: A case study from the Lower-Middle Ordovician Yingshan Formation in Tahe oilfield, Tarim Basin, China

Cited by 19 publications

References 22 publications

Impact of pore structure and fractal characteristics on the sealing capacity of Ordovician carbonate cap rock in the Tarim Basin, China

Impact of pore structure and fractal characteristics on the sealing capacity of Ordovician carbonate cap rock in the Tarim Basin, China

Optimized Random Vector Functional Link network to predict oil production from Tahe oil field in China

The application of N2 huff and puff for IOR in fracture-vuggy carbonate reservoir

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