Acoustic and petrophysical properties of mechanically compacted overconsolidated sands: Part 2 – Rock physics modelling and applications

Narongsirikul, Sirikarn; Mondol, Nazmul Haque; Jahren, Jens

doi:10.1111/1365-2478.12692

Cited by 11 publications

(5 citation statements)

References 27 publications

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“…This is consistent with observations made in other studies (Sulaimon and Teng, 2020). Sands with higher AI values tend to be more consolidated compared to sands with lower AI values (Narongsirikul et al, 2019). Sulaimon and Teng (2020) successfully applied shear modulus to bulk compressibility ratio as a quick assessment to predict potential to sanding in clean sands.…”

Section: Estimated Elastic Parameterssupporting

confidence: 89%

Predicting Sanding Potential Using Empirical Method in “Ebendo” Field, Niger Delta, Nigeria

Ajayi¹,

Adeogun²,

Omeru³

2022

jasem

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Sand formations represent a large fraction of oil and/or gas reservoirs in the world, hence it becomes imperative to determine the competency of the reservoirs to produce sand-free hydrocarbon. This informed the empirical technique adopted in this study to evaluate elastic parameters such as shear modulus (G), bulk compressibility (Cb), shear modulus to bulk compressibility (G/Cb) ratio and Unconfined Compressive Strength (UCS) to determine sand influx in the “Ebendo” Field, Niger Delta, Nigeria. To achieve this goal, seven (7) hydrocarbon-bearing sand units with thicknesses ranging from 12.51 to 48.63 m were identified at depth range of 1884.79 - 3350.15 m across the four (4) wells. These elastic parameters were estimated at the interval of interest. The range of values obtained for G/Cb ratio in EBD (01 and 02) is 1.49 × 1012 - 5.40 × 1012 psi2 while the range of values for G/Cb ratio in EBD (04 and 06) is 0.06 × 1012 - 0.41 × 1012 psi2. This result suggests that EBD (01 and 02) have no potential to sanding while EBD (04 and 06) have a high probability of sanding when compared to the threshold value of 0.8 × 1012 psi2. The production history of the “Ebendo” Field also correlates with the findings of this study. The low values of UCS in EBD (04 and 06) also agrees with the observation. Thus, this study has shown the efficacy of using empirical method as a quick approach to predicting sand production in the “Ebendo” Field and this technique could be used in other fields with similar geological setting.

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Section: Estimated Elastic Parameterssupporting

confidence: 89%

Predicting Sanding Potential Using Empirical Method in “Ebendo” Field, Niger Delta, Nigeria

Ajayi¹,

Adeogun²,

Omeru³

2022

jasem

View full text Add to dashboard Cite

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“…Effective stress reduction due to sediment uplift or excess pore fluid pressure affects acoustic, geomechanical and petrophysical properties (Holt ; Bowers and Katsube ; Zimmer et al . ; Narongsirikul, Mondol and Jahren ,b). Increase of vertical weight on the sediments results in porosity loss, as well as increase of velocity and density in the underlain sediments.…”

Section: Introductionmentioning

confidence: 99%

“…The acoustic velocity data studied in Narongsirikul et al . (,b) are used to estimate dynamic elastic properties. The relationships between rock acoustic and mechanical properties, and the different behaviours between normal compaction and OC are investigated.…”

Section: Introductionmentioning

confidence: 99%

Effects of stress reduction on geomechanical and acoustic relationship of overconsolidated sands

Narongsirikul

Mondol

Jahren

2019

Geophysical Prospecting

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A B S T R A C TRelationship between different geomechanical and acoustic properties measured from seven laboratory-tested unconsolidated natural sands with different mineralogical compositions and textures were presented. The samples were compacted in the uniaxial strain configuration from 0.5 to 30 MPa effective stress. Each sand sample was subjected to three loading-unloading cycles to study the influence of stress reduction. Geomechanical, elastic and acoustic parameters are different between normal compaction and overconsolidation (unloaded and reloaded). Stress path (K 0 ) data differ between normal consolidated and overconsolidated sediments. The K 0 value of approximately 0.5 is founded for most of the normal consolidated sands, but varies during unloading depending on mineral compositions and textural differences. The K 0 and overconsolidation ratio relation can be further simplified and can be influenced by the material compositions. K 0 can be used to estimate horizontal stress for drilling applications. The relationship between acoustic velocity and geomechanical is also found to be different between loading and unloading conditions. The static moduli of the overconsolidated sands are much higher than normal consolidated sands as the deformation is small (small strain). The correlation between dynamic and static elastic moduli is stronger for an overconsolidation stage than for a normal consolidation stage. The results of this study can contribute to geomechanical and acoustic dataset which can be applied for many seismic-geomechanics applications in shallow sands where mechanical compaction is the dominant mechanism.

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“…The results are compared with previously published sand compaction datasets and with well logs from the Barents Sea Shelf. The use of these laboratory data to build on existing rock physics models, and their applications to reservoir monitoring are reported in a companion paper (Narongsirikul Mondol and Jahren ).…”

Section: Introductionmentioning

confidence: 99%

Acoustic and petrophysical properties of mechanically compacted overconsolidated sands: part 1 – experimental results

Narongsirikul

Mondol

Jahren

2019

Geophysical Prospecting

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This paper part one is set out to lay primary observations of experimental compaction measurements to form the basis for rock physics modelling in paper part two. P‐ and S‐wave velocities and corresponding petrophysical (porosity and density) properties of seven unconsolidated natural sands with different mineralogical compositions and textures are reported. The samples were compacted in a uniaxial strain configuration from 0.5 up to 30 MPa effective stresses. Each sand sample was subjected to three loading cycles to study the influence of stress reduction on acoustic velocities and rock physical properties with the key focus on simulating a complex burial history with periods of uplift. Results show significant differences in rock physical properties between normal compaction and overconsolidation (unloaded and reloaded). The differences observed for total porosity, density, and P‐ and S‐wave velocities are attributed to irrecoverable permanent deformation. Microtextural differences affect petrophysical, acoustic, elastic and mechanical properties, mostly during normal consolidation but are less significant during unloading and reloading. Different pre‐consolidation stress magnitudes, stress conditions (isotropic or uniaxial) and mineral compositions do not significantly affect the change in porosity and velocities during unloading as a similar steep velocity–porosity gradient is observed. The magnitude of change in the total porosity is low compared to the associated change in P‐ and S‐wave velocities during stress release. This can be explained by the different sensitivity of the porosity and acoustic properties (velocities) to the change in stress. Stress reduction during unloading yields maximum changes in the total porosity, P‐ and S‐wave velocities of 5%, 25%, and 50%, respectively. These proportions constitute the basis for the following empirical (approximation) correlations: Δϕ ∼ ±5 ΔVP and ΔVP ∼ ±2ΔVS. The patterns observed in the experiments are similar to well log data from the Barents Sea. Applications to rock physics modelling and reservoir monitoring are reported in a companion paper.

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Acoustic and petrophysical properties of mechanically compacted overconsolidated sands: Part 2 – Rock physics modelling and applications

Cited by 11 publications

References 27 publications

Predicting Sanding Potential Using Empirical Method in “Ebendo” Field, Niger Delta, Nigeria

Predicting Sanding Potential Using Empirical Method in “Ebendo” Field, Niger Delta, Nigeria

Effects of stress reduction on geomechanical and acoustic relationship of overconsolidated sands

Acoustic and petrophysical properties of mechanically compacted overconsolidated sands: part 1 – experimental results

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