Formation Electrical Anisotropy Derived From Induction-Log Measurements in a Horizontal Well

Bang, Jon; Solstad, Arne; Mjaaland, Svein

doi:10.2118/75115-pa

Cited by 2 publications

(1 citation statement)

References 2 publications

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“…Aplin et al 1999). Shale anisotropic characteristics are, on the other hand, needed to have an accurate mechanical earth model for the wellbore stability analysis (Gholami et al 2015) and to correct electrical logs for estimation of water saturation (Bang et al 2000;Wei, 2003). Geomechanical parameters of shale reservoirs should also be estimated for the caprock stability analysis, determination of drilling directions and hydraulic fracture initiations (Nygard et al 2004;Dewhurst et al 2008;Delle Piane et al 2011).…”

Section: Introductionmentioning

confidence: 99%

Brittleness of gas shale reservoirs: A case study from the north Perth basin, Australia

Gholami

Rasouli

Sarmadivaleh

et al. 2016

Journal of Natural Gas Science and Engineering

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Shale reservoirs have gained the attention of many in recent years due to their potential as a major gas resource. Production from this kind of formation, however, requires an accurate estimation of brittleness and employments of hydraulic fracturing. There have been many studies as to how brittleness can be estimated, but few research works were carried out so far indicating how brittleness indices vary in gas shale formations. The aim of this paper is to evaluate the variation of brittleness in one of the gas shale reservoirs located in the north Perth Basin of Australia. The results obtained indicated that the lower part of the Carynginia shale should be selected for a hydraulic fracturing job due to a high brittleness index, although a careful analysis of Total Organic Content (TOC) might be required before initiating any plans. The mineralogical report and interpretations revealed that the space created by cross-plotting the elastic parameters is able to identify dominant minerals contributing into brittleness. Performing a series of true triaxial tests, which are capable of simulating the real field condition by applying three independent principal stresses, implied that as the stress anisotropy increases, a transition takes place from brittle towards the ductile behaviours. However, when this anisotropy becomes significant, samples regain their strength. This study, therefore, recommends more studies to get a practical conclusion on brittleness under true triaxial conditions.

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Section: Introductionmentioning

confidence: 99%

Brittleness of gas shale reservoirs: A case study from the north Perth basin, Australia

Gholami

Rasouli

Sarmadivaleh

et al. 2016

Journal of Natural Gas Science and Engineering

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Imparting Directional Dependence on Log-Derived Permeability

Schön

Georgi²,

Fanini³

2003

SPE Reservoir Evaluation &Amp; Engineering

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Cost-effective, efficient production of hydrocarbons depends on accurate reserves estimates, reservoir architecture, and hydrocarbon distribution. In addition, a complete reservoir description, including both horizontal and vertical permeability, is critical to efficient development strategy. Hydrocarbon recovery efficiency depends on many factors, but one key parameter is the ratio of vertical to horizontal permeability.There are numerous ways to estimate permeability. It is now possible to estimate permeability from continuous formation evaluation measurements. However, it remains difficult to determine directional permeability. Nuclear magnetic resonance (NMR) logs are used routinely to estimate permeability, but NMR-derived permeability is based on scalar properties (e.g., , T 2 distributions from NMR, and bulk volume irreducible water) and is inherently a scalar property itself.Few formation evaluation measurements provide directional information. Dip and image logs provide bed thickness and layer dip information, while the multicomponent induction instrument (3DEX*) and crossed-dipole shear-wave acoustic tools provide direct measurements of macroscopic formation anisotropy.In this paper, we explore theoretically and with real data the computation of permeability anisotropy. We use laminated sand models as well as macroscopic models based on the resistivity anisotropy measurements to estimate k V :k H ratios. In addition to multicomponent induction data, we explore stand-alone and joint interpretation of NMR property variations to predict the macroscopic reservoir permeability anisotropy.* 3DEX SM is a service mark owned by Baker Hughes Inc.

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Formation Electrical Anisotropy Derived From Induction-Log Measurements in a Horizontal Well

Cited by 2 publications

References 2 publications

Brittleness of gas shale reservoirs: A case study from the north Perth basin, Australia

Brittleness of gas shale reservoirs: A case study from the north Perth basin, Australia

Imparting Directional Dependence on Log-Derived Permeability

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