Quantitative characterization of deep fault-karst carbonate reservoirs: A case study of the Yuejin block in the Tahe oilfield

Hu, Xiangyang; Zheng, Wenbo; Zhao, Xiangyuan; Niu, Bo

doi:10.1016/j.engeos.2022.100153

Cited by 8 publications

(8 citation statements)

References 2 publications

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“…S4 represents chaotic and low amplitude seismic reflectors that could be linked to deposits with karst features related to Early Cenomanian massive dolomitic rocks defined as the Hammana–Sannine transition unit. Karst features have been interpreted in terms of seismic facies as chaotic seismic reflections with low amplitude (Burberry et al., 2016; Embry et al., 2021; Hendry et al., 2021; Hu et al., 2023; Sayago et al., 2012). This can be related to the petrophysical properties of karstified rocks often characterized by lower AI values compared to the surrounding rock units (Fournillon et al., 2021).…”

Section: Discussionmentioning

confidence: 99%

Seismic characterization of Cenomanian–Turonian carbonate platform based on sedimentological and geophysical investigation of onshore analogue outcrop (northern Lebanon)

Abbani

Adelinet

Inati

et al. 2023

Geophysical Prospecting

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Outcrop analogues play a key role in the characterization of subsurface carbonate platforms. The lack of well data and relevant outcrop analogues can result in the misinterpretation of seismic data. To address this issue, we apply an integrated workflow based on sedimentology, geophysics and petrophysics on outcrop analogues present onshore Lebanon, to constrain the carbonate platform's properties on onshore seismic data. A thorough sedimentary description is completed for a 400‐m‐thick Cenomanian–Turonian carbonate platform located in Kfarhelda, northern Lebanon. P‐wave velocity is acquired directly on the outcrop, and the petrophysical properties are measured on 44 samples. A 1D synthetic seismogram is computed with Ricker wavelet 25 Hz resembling seismic resolution. The resulting reflectors are mainly (1) high amplitude reflectors at the limit between two facies with contrasting physical properties enhanced by diagenesis, (2) moderate amplitude reflectors corresponding to stratigraphic limits at the transition between facies and (3) very low amplitude reflectors in karstified units. The integration of outcrop and seismic data is based on the generation of the synthetic seismogram to identify the geological origin of reflectors. The best fit between the synthetic seismic and seismic profile is used to interpret a seismic facies representing bedded limestones of Sannine and Maameltain formations (Cenomanian–Turonian). Two other distinctive reflectors are identified at the boundary of the Marly Limestone Zone, and the Channel facies unit characterized by bioclastic packstone to floatstone. This study highlights the importance of using outcrop analogues to identify the seismic signal of stratigraphic sequences and improve the interpretation of onshore seismic data.

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Section: Discussionmentioning

confidence: 99%

Seismic characterization of Cenomanian–Turonian carbonate platform based on sedimentological and geophysical investigation of onshore analogue outcrop (northern Lebanon)

Abbani

Adelinet

Inati

et al. 2023

Geophysical Prospecting

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“…Complexities of the Tahe Oilfield stem from various types of reservoir burial depth, multi-scale and discrete fractures, vuggies, complicated seismic responses, and multiple solutions of the inverse model, which lead to great challenges in effective reservoir recognition and prediction [21]. Based on diffracted wave separation and high-precision reverse-time depth migration imaging, the internal structure of multi-scale fracture systems can be established through melt-prediction technology [22].…”

Section: Seismic Geophysical Prediction Technologymentioning

confidence: 99%

Key Technologies for Oil and Gas Development from Deep Carbonate Fractured-Vuggy Reservoirs

Thuloj¹

2023

J Immuno Res & Reports

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“…The Tahe Oilfield's water injection method for oil production is applied to establish the relationship between water injection and pressure, using the pressure change law from wellhead to bottom-hole flow pressure to formation pressure, to calculate controlled reserves for individual wells [22,23]. The fracture-vuggy carbonate reservoir is segmented into units based on the similarity principle, and dynamic reserves are calculated for each reservoir at various stages [24][25][26]. The D type water drive characteristic curve is derived from the relationship between the oil-water relative permeability ratio and water saturation, with the linear proportional coefficient inversely related to geological reserves [27,28].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Reserve Calculation Method of Fractured-Vuggy Reservoir Based on Modified Comprehensive Compression Coefficient

He,

Chen,

Yuan

et al. 2024

Processes

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The low comprehensive compressibility coefficient characteristic of fracture-vuggy reservoirs often leads to imprecise dynamic reserve calculations. This study introduces a novel method for estimating dynamic reserves, which incorporates a modified comprehensive compressibility coefficient to enhance accuracy. This methodology has been applied to 23 wells in the Tahe Oilfield, resulting in error rates substantially lower than those associated with traditional techniques, thereby markedly enhancing the accuracy of dynamic reserve estimations. Specifically, for karst cave and fracture-vuggy reservoirs, the error rate in dynamic reserve calculations is reduced to under 10%, surpassing conventional methods by more than fivefold. In the case of fractured reservoirs, despite minor fluctuations in error rates due to stress sensitivity, diversion capacity, and channel variations, the proposed method still demonstrates a significant reduction in error rates compared to standard practices.

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Quantitative characterization of deep fault-karst carbonate reservoirs: A case study of the Yuejin block in the Tahe oilfield

Cited by 8 publications

References 2 publications

Seismic characterization of Cenomanian–Turonian carbonate platform based on sedimentological and geophysical investigation of onshore analogue outcrop (northern Lebanon)

Seismic characterization of Cenomanian–Turonian carbonate platform based on sedimentological and geophysical investigation of onshore analogue outcrop (northern Lebanon)

Key Technologies for Oil and Gas Development from Deep Carbonate Fractured-Vuggy Reservoirs

Dynamic Reserve Calculation Method of Fractured-Vuggy Reservoir Based on Modified Comprehensive Compression Coefficient

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