Velocity Modeling to Determine Pore Aspect Ratios of the Haynesville Shale

Oh, Kwon Taek; Spikes, Kyle

doi:10.1190/segam2012-0508.1

Cited by 3 publications

(1 citation statement)

References 9 publications

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“…This leads to a higher seismic velocity than that obtained with interparticle pores. In contrast, thin or elongated pores such as cracks and microporosity often lead to slower velocity by rock softening (Oh and Spikes, 2012). The pore aspect ratio is a textural parameter that contributes for stiffness or softness carbonate rock characterization.…”

Section: Introductionmentioning

confidence: 98%

Dual pore system evaluation of Albian grainstone carbonates from Brazil using effective elastic media theory models

Neto¹,

Misságia²,

Ceia³

et al. 2013

SEG Technical Program Expanded Abstracts 2013

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Carbonates represent a significant portion of the Brazil's deepwater oil production, whose importance has increased with recent discoveries in the post-salt and pre-salt oil deposits. Often carbonates are characterized by a heterogeneous pore system, displaying a complex pore structure with wide range of pore sizes and shapes. This work aims towards investigating grainstone carbonates (Albian-age) of the offshore Campos Basin, Brazil by laboratorial evaluation and rock physics modeling to predict interparticle aspect ratio and quantitative fractions of a dual pore system approach under ultrasonic and dry conditions. The goal is to estimate elastic moduli considering intergranular porosity expected in oncolytic/oolitic grainstones using Effective Elastic Media (EEM) theories -KT (Kuster-Toksöz), SC (Self-consistent) and DEM (Differential Effective Medium), and either a spherical inclusions or a microporosity dominated pore system. The results show that the KT and DEM give a best compatibility with the texture of the Albian grainstone carbonates. Interparticle aspect ratio estimation and a quantitative prediction of the inclusion effects helped us to understand the elastic properties of Albian carbonates.

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Section: Introductionmentioning

confidence: 98%

Dual pore system evaluation of Albian grainstone carbonates from Brazil using effective elastic media theory models

Neto¹,

Misságia²,

Ceia³

et al. 2013

SEG Technical Program Expanded Abstracts 2013

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Aspect ratio histograms of 3D ellipsoids and 2D ellipses — Analytical relations and numerical examples

Landrø

2015

GEOPHYSICS

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A typical way of characterizing rocks, composite materials, or human tissue is to extract aspect ratio histograms. A common assumption for this type of analysis is that the sample is composed of several grains or building elements that have a similar shape. Among various shapes, the ellipsoid is very common. In practice, such detailed analysis is performed on 2D cuts or slices through the material. It is intuitive that there is a difference between a 2D aspect ratio histogram and the corresponding 3D histogram. I have derived simple equations that can be used to transform from 3D to 2D and also from 2D to 3D, assuming that the two shortest axes in the ellipsoid were equal. For the general case, when all axes were different, an approximate equation was derived. All equations were compared with stochastic numerical simulations of cutting a 3D ellipsoid by an arbitrary random number of planes. It was determined that in the general case, the shortest aspect ratio would dominate the 2D histograms and that it was practically impossible to detect the highest aspect ratio from 2D planar cuts.

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Application of effective elastic media models for pore system evaluation of Albian grainstone carbonates from Campos Basin, Brazil

Neto

Misságia

Ceia

et al. 2013

13th International Congress of the Brazilian Geophysical Society &Amp; EXPOGEF, Rio De Janeiro, Brazil, 26–29 August 2013

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Velocity Modeling to Determine Pore Aspect Ratios of the Haynesville Shale

Cited by 3 publications

References 9 publications

Dual pore system evaluation of Albian grainstone carbonates from Brazil using effective elastic media theory models

Dual pore system evaluation of Albian grainstone carbonates from Brazil using effective elastic media theory models

Aspect ratio histograms of 3D ellipsoids and 2D ellipses — Analytical relations and numerical examples

Application of effective elastic media models for pore system evaluation of Albian grainstone carbonates from Campos Basin, Brazil

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