Integration of Rock Physics and Seismic Inversion for Net-To-Gross Estimation: Implication for Reservoir Modelling and Field Development in Offshore Niger Delta

Chudi, Obinna; Iwegbu, James; Tetegan, Gerard; Ikwueze, Obinna; Effiom, Oghogho; Oke-oghene, Uruh; Ayodeji, Babatunde; Opatewa, Stephen; Oladipo, Titi; Afolayan, Tunbosun; Tonyi, Amba-Ambaiowei; Osayande, Francesca; Falade, Oladipo; Kanu, Magnus; Anaevune, Austin; Emakpor, Jake; Afulukwe, Chuks; Pokima, Sophie

doi:10.2118/198765-ms

Cited by 2 publications

(1 citation statement)

References 3 publications

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“…The net-to-gross ratio measures the thickness of productive (net) reservoir rock compared to the thickness of the entire reservoir (gross) [67]. This term describes the reservoir areas that can be used to get hydrocarbons.…”

Section: Net-to-gross (Ntg)mentioning

confidence: 99%

Petrophysical Analysis Based on Well Logging Data for Tight Carbonate Reservoir: The SADI Formation Case in Halfaya Oil Field

Jassam,

AL-Fatlawi,

Canbaz

2023

IJCPE

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Carbonate reservoirs are an essential source of hydrocarbons worldwide, and their petrophysical properties play a crucial role in hydrocarbon production. Carbonate reservoirs' most critical petrophysical properties are porosity, permeability, and water saturation. A tight reservoir refers to a reservoir with low porosity and permeability, which means it is difficult for fluids to move from one side to another. This study's primary goal is to evaluate reservoir properties and lithological identification of the SADI Formation in the Halfaya oil field. It is considered one of Iraq's most significant oilfields, 35 km south of Amarah. The Sadi formation consists of four units: A, B1, B2, and B3. Sadi A was excluded as it was not filled with hydrocarbons. The structural and petrophysical models were built based on data gathered from five oil wells. The data from the available well logs, including RHOB, NPHI, SONIC, Gamma-ray, Caliper, and resistivity logs, was used to calculate the petrophysical properties. These logs were analyzed and corrected for environmental factors using IP V3.5 software. where the average formation water resistivity (Rw = 0.04), average mud filtrate resistivity (Rmf = 0.06), and Archie's parameters (m = 2, n = 1.9, and a = 1) were determined. The well-log data values calculated the porosity, permeability, water saturation, and net-to-gross thickness ratio (N/G).

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Section: Net-to-gross (Ntg)mentioning

confidence: 99%

Petrophysical Analysis Based on Well Logging Data for Tight Carbonate Reservoir: The SADI Formation Case in Halfaya Oil Field

Jassam,

AL-Fatlawi,

Canbaz

2023

IJCPE

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Seismic net-to-gross estimation for a geologic model update: A case study from a turbidite lobe reservoir in the deepwater of the Niger Delta

Olagundoye,

Akhajeme,

Yusuf

et al. 2024

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Geological model updates are routinely performed in mature fields to obtain improved descriptions of facies distributions and reservoir properties such as volume of shale, net-to-gross (NTG), porosity, etc., for better understanding of the static and dynamic behaviors of reservoirs for effective well placement, improved production, and monitoring. A simple but integrated seismic NTG estimation approach, using detuned seismic amplitudes was employed in guiding NTG modeling during the geological model update of a thin turbidite lobe reservoir in a mature oil field in the deep offshore Niger Delta. The objective was to address NTG overestimation and gross rock volume (GRV) uncertainty in a previous model arising from seismic amplitude tuning effects. A seismic NTG approach was chosen relative to sophisticated deterministic or stochastic inversion techniques to avoid tuning effects which usually bias NTG estimates in thin turbidite reservoirs. The primary dataset was a 2019 reprocessed Prestack Depth Migrated (PSDM) seismic data vintage which had better resolution, higher signal-to-noise ratio (SNR), and more appropriate angle-stack apertures for amplitude versus angle (AVA) fidelity, than the older 2011 PSDM seismic data that was used in the previous geological model. The methodology involved rock physics analysis, seismic data quality checks, tuned area determination, detuning of composite seismic amplitudes of the top and base reservoir, and their direct calibration to NTG at wells. Good correlations were obtained between the detuned composite seismic amplitudes and NTG at wells. The seismic NTG map showed good calibrations at wells and provided a robust trend for net sand modelling in the oil pool and aquifer. Static model QCs and dynamic simulations proved that the seismic NTG attribute addressed the GRV uncertainty in the earlier model, thus giving confidence for use of the updated model for the planning and geosteering of infill wells, sand completions, reservoir monitoring, and production.

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Integration of Rock Physics and Seismic Inversion for Net-To-Gross Estimation: Implication for Reservoir Modelling and Field Development in Offshore Niger Delta

Cited by 2 publications

References 3 publications

Petrophysical Analysis Based on Well Logging Data for Tight Carbonate Reservoir: The SADI Formation Case in Halfaya Oil Field

Petrophysical Analysis Based on Well Logging Data for Tight Carbonate Reservoir: The SADI Formation Case in Halfaya Oil Field

Seismic net-to-gross estimation for a geologic model update: A case study from a turbidite lobe reservoir in the deepwater of the Niger Delta

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