Rock physics model to determine the geophysical pore-type characterization and geological implication in carbonate reservoir rock

Handoyo, Handoyo; Fatkhan, _; Hutami, Harnanti Yogaputri; Sudarsana, Rizki

doi:10.1088/1755-1315/311/1/012031

Cited by 4 publications

(5 citation statements)

References 10 publications

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“…However, this parameter becomes less important, and the elastic properties become closer as the pore shapes tend to be circular. This phenomenon has also been observed in other studies (Toksöz et al 1976;Levin et al 2004;Markov et al 2006;Candikia et al 2017;Handoyo et al 2019;Ozotta et al 2021d). The uncertainties in our KT model predictions are presented in Supplementary Information (Fig.…”

Section: Predicted Fractomechanical Properties From Kt Modelsupporting

confidence: 86%

“…7a, b). This phenomenon has also been observed in other studies (Toksöz et al 1976;Levin et al 2004;Markov et al 2006;Candikia et al 2017;Handoyo et al 2019;Ozotta et al 2021d). As the aspect ratio decreases, the separation increases monotonically.…”

Section: Predicted Fractomechanical Properties From Dem Modelsupporting

confidence: 86%

“…Furthermore, pore morphology interpreted the impacts of seismic wave velocity on the reservoir rock of the study area, where stiff pores or increasing aspect ratio values cause the seismic wave velocity to increase significantly and crack pores or decreasing aspect ratio values cause the seismic wave velocity to decrease significantly. According to the findings of the pore morphology modeling study, the result will define the rate at which the reservoir can be suitable for exploration (Lucia 1999;Handoyo et al 2019). Interparticle and micro-cracks pore permeability reservoirs may significantly enhance and define the sweet spots of permeable reservoirs.…”

Section: Predicted Fractomechanical Properties From Dem Modelmentioning

confidence: 99%

“…Here, identifying the mechanisms of the pore structure of the reservoir formation is crucial since they can impact seismic velocities (V p and V s ), and fracture initiation and propagation. Previous research works have already investigated how pore morphology affects the seismic velocities of rocks and composite geomaterials (Levin et al 2004;Markov et al 2006;Paoletti 2012;Candikia et al 2017;Handoyo et al 2019;Kolawole and Ispas 2019;Mavko et al 2020;Kolawole 2022). The findings from these investigations demonstrate that when porosity is held constant, cracks (low aspect ratio) dramatically reduce seismic velocities more than spherical pores (high aspect ratio).…”

Section: Introductionmentioning

confidence: 99%

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Pore morphology effect on elastic and fluid flow properties in Bakken formation using rock physics modeling

Ozotta

Saberi²,

Kolawole

et al. 2022

Geomech. Geophys. Geo-energ. Geo-resour.

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Unconventional geo-resources are critical due to their important contributions to energy production. In this energy transition and sustainability era, there is an increased focus on CO2-enhanced oil recovery (CO2-EOR) and geological CO2 storage (GCS) in unconventional hydrocarbon reservoirs, and the extraction of hot fluid for energy through enhanced geothermal systems. However, these energy solutions can only be achieved through efficient stimulation to develop a complex fracture network and pore structure in the host rocks to extract heat and hydrocarbon, or for CO2 storage. Using Bakken formation well data and rock physics models, this study aimed to identify the post-depositional effect of pore structure on seismic velocity, elastic moduli, and formation fluid; and further predict the best lithofacies interval for well landing, and the implications for fluid (gas, oil, and water) recovery in naturally- and often systematically-fractured geosystems. The KT and DEM models' predictions show distinct formation intervals exhibiting needle-like pores and having higher seismic velocities (Vp and Vs) and elastic moduli (K and µ), relative to other formation intervals that exhibit moldic pores. At the same fluid concentration, the needle-like pores (small aspect ratios) have a higher impact on elastic moduli, Vp, and Vs than on the moldic spherical pores with all other parameters held constant. Vp is affected more than Vs by the properties of the saturating fluid (gas, oil, or water) with Vp being greater in Bakken formation when it is water-saturated than when it is gas-saturated. Vs exhibit the reverse behavior, with Vs greater in the gas-saturated case than in the water-saturated case. Further, analyses suggest that the middle Bakken formation will have a higher susceptibility to fracturing and faulting, and hence will achieve greater fluid (oil and water) recovery. Our findings in this study provide insights that are relevant for fluid production and geo-storage in unconventional reservoirs. Article highlights Integrated well log data and rock physics models. Investigated the effect of changes in pore structure on elastic properties and fluid flow in shale. Increase in porosity causes a reduction in elastic moduli and seismic velocities. Vp is more affected by pore geometry than Vs depending on density and properties of saturating fluid. Lithofacies with needle−like pores are more susceptible to fracturing than lithofacies with intragranular pores.

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Section: Predicted Fractomechanical Properties From Kt Modelsupporting

confidence: 86%

Section: Predicted Fractomechanical Properties From Dem Modelsupporting

confidence: 86%

Section: Predicted Fractomechanical Properties From Dem Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Pore morphology effect on elastic and fluid flow properties in Bakken formation using rock physics modeling

Ozotta

Saberi²,

Kolawole

et al. 2022

Geomech. Geophys. Geo-energ. Geo-resour.

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“…The aspect ratio of cracks ranges from 0.01 -0.02. The aspect ratio of stiff pores ranges from 0.7 -0.8, and the aspect ratio of inter-particle pores ranges from 0.12 -0.15 [32]. In order to achieve the most precise fit to the measurement data, we assumed a similar aspect ratio based on the reference study and relentlessly adjusted the calculations until they were precisely accurate.…”

Section: Methodsmentioning

confidence: 99%

Identifying Pore Type of Lagoon and Barrier Carbonate to Model Shear Wave Velocity in Salawati Basin by Differential Kuster-ToksÖz

Wulandari

Rosid

2023

Positron

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The shape of pores in sedimentary rocks is dependent on the geometric structure of the rock matrix grains. Carbonate rocks have more complex pore types compared to clastic due to the effects of diagenesis and the depositional environment. The study analyzed the deposition of Kais carbonate in barrier and lagoon environments. It categorized the pores into inter-particle, moldic/vuggy, and micro-cracks. The type of pore in a rock is directly related to its stiffness and shear resistance, which influences its shear wave velocity (Vs). Thus, a higher shear modulus leads to a higher Vs value. Reservoir characterization heavily relies on the Vs data. However, this data is limited to the observed area. Therefore, Vs modeling is a more effective and efficient approach. The modeling will conduct thoroughly with the identification of the pore type. The rocks moduli are calculated by the pore inclusion method using the differential Kuster-Toksöz (DKT) equation and defining the aspect ratio, reflecting the pore type. The YP-1 well has barrier carbonate, while YP-2 and YP-3 have lagoon carbonate with inter-particle as the primary pore type. Micro-cracks on top of Kais are present. YP-4 and YP-5 have similar proportions of micro-cracks and inter-particle as dominant pore types. The predicted Vs and measured logs strongly correlate with an R2 value above 0.8. The Vs value range for micro-cracks is 2,300 ft/s to 6,000 ft/s, and for inter-particle, it is 6,000 ft/s to 8,500 ft/s. Pore types above 8,500 ft/s are very stiff (moldic pore type).

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A Tri-Training method for lithofacies identification under scarce labeled logging data

et al. 2023

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Rock physics model to determine the geophysical pore-type characterization and geological implication in carbonate reservoir rock

Cited by 4 publications

References 10 publications

Pore morphology effect on elastic and fluid flow properties in Bakken formation using rock physics modeling

Pore morphology effect on elastic and fluid flow properties in Bakken formation using rock physics modeling

Identifying Pore Type of Lagoon and Barrier Carbonate to Model Shear Wave Velocity in Salawati Basin by Differential Kuster-ToksÖz

A Tri-Training method for lithofacies identification under scarce labeled logging data

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