Identifying vertical productive fractures in the Narraway gas field using the envelope of seismic anisotropy

Todorović-Marinić, Dragana; Larson, Glenn; Gray, David; Soule, Greg; Zheng, Ye; Pelletier, J. D.

doi:10.1190/1.1851113

Cited by 8 publications

(3 citation statements)

References 4 publications

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“…The anisotropy parameters of this effective medium, which is transversely isotropic with a horizontal symmetry axis (HTI), can be estimated from reflection data and related to the fractures. Seismic signatures that can be inverted for the HTI parameters include shear-wave splitting (e.g., Gaiser and Van Dok, 2005), P-and S-wave NMO ellipses (Tsvankin, 1997b;Bakulin et al, 2000a;Berthet et al, 2004), and azimuthal AVO response (Bakulin et al, 2000a;del Monte et al, 2004;Gray and Todorovic-Marinic, 2004;Minsley et al, 2004;Todorovic-Marinic et al, 2004;Bachrach et al, 2009).…”

Section: Seismic Characterization Of Natural Fracturesmentioning

confidence: 97%

Seismology of Azimuthally Anisotropic Media and Seismic Fracture Characterization

Tsvankin¹,

Grechka²

2011

183

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Section: Seismic Characterization Of Natural Fracturesmentioning

confidence: 97%

Seismology of Azimuthally Anisotropic Media and Seismic Fracture Characterization

Tsvankin¹,

Grechka²

2011

183

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“…Processing of cross multipole array acoustics log data is required to know the dispersion characteristics of S-waves with frequency for its identification of stress-induced and intrinsic anisotropy. Stress direction is required for geomechanical application, oriented perforation, and effective fracturing in objective formations (Fletcher et al 1996;Todorovic-Marinic et al 2004).…”

Section: Introductionmentioning

confidence: 99%

Anisotropy and fracture analysis for coalbed methane reservoir development in Bokaro coalfield, India

Banerjee

Chatterjee

Singha

2022

Geophysical Prospecting

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The efficient production of Coalbed Methane (CBM) gas is facing challenges due to the larger dewatering period from fracture connectivity to the aquifer zone. Also, commingled production from well makes it more difficult to identify the coal seam-wise problem. Therefore, prior knowledge of sub-surface fractures in coal seams is necessary to execute an accurate simulation model for planning hydraulic fracturing treatment. This paper highlights the studies in Bokaro CBM reservoir to mitigate challenges in few wells by characterizing anisotropy, determining fast shear wave polarization angle, maximum horizontal stress direction, fracture orientation, and analysis of low resistivity signature. Both the fast shear wave polarization angle and fracture orientation in resistivity image are observed in the same direction (N26°-35°E) in coal. The fast and slow shear slowness versus frequency plot concludes stress-induced anisotropy resulting from fractures that are supported by resistivity image and drilling core.Processing of the resistivity image log shows the maximum horizontal stress is along NE-SW direction, as identified from drilling-induced fractures. The observation of low resistivity signature with resistivity ranging from 0.4 to 0.8 ohm-m in few wells confirms the presence of conducting minerals such as siderite and pyrite from the x-ray diffraction studies of sidewall core. The present work guides in making production, drilling, and hydraulic fracturing design strategies to better understand the fluid propagation for optimized CBM production and will also help in future geomechanical studies.

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“…Nevertheless, the reverse-thrust faulting nature of the Canadian Rockies foothills in this region created swarms of natural fractures, which allows these horizons the potential to deliver high gas-flow rates. The presence, characterization, and identification of these natural-fracture swarms have long been recognized as the key for any exploration and development effort leading to successful and commercial projects (Todorovic-Marinic et al 2004).…”

Section: Introductionmentioning

confidence: 99%

Use of Pressure/Rate Deconvolution To Estimate Connected Reservoir-Drainage Volume in Naturally Fractured Unconventional-Gas Reservoirs From Canadian Rockies Foothills

Chen

Jones

2012

SPE Reservoir Evaluation &Amp; Engineering

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Case studies are presented in this paper to demonstrate the use of the pressure/rate deconvolution-approach in estimating drainage areas for wells completed in some of the naturally fractured tight gas reservoirs of the Canadian Rockies foothills. These case studies demonstrate the application of deconvolution to two key carbonate-stratigraphical horizons in the area: the Triassic Baldonnel and the Permo-Carboniferous Taylor Flat formations. In these structural plays with significant areal formation-rock heterogeneity, the matrix-rock properties controlling the gas storativity are low, with porosity between 3 and 6%, causing low matrix-rock permeability (from 0.01 and 0.1 md). However, all of these formations have been thrusted, overturned, and subjected to reverse faulting. These diagenetic factors have created swarms of natural fractures that control flow rates and may define rock volumes connected to individual wells.In each well, a preproduction flow test was performed with the intent of ensuring acceptable flow rates and scoping facility design. At this stage of early development, initial-gas-in-place (IGIP) estimates were derived mainly from geophysical mapping, with plans to calibrate the IGIP number through the application of gas material balance, rate-transient analysis, and/or simple latetime rate decline. The rate-history data available in the early stage of production were integrated with pressure-buildup (PBU) data collected later in the production life of the well during annual or routine shut-in periods that were relatively short. Application of deconvolution in this paper is aimed at detecting early signs of pseudosteady-state pool depletion and estimating connected drainage volume. The deconvolution procedures help calibrate and/or reconcile geosciences-defined volumetric resource sizes, map remaining reserves, and help identify possible infill-drilling opportunities.

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Identifying vertical productive fractures in the Narraway gas field using the envelope of seismic anisotropy

Cited by 8 publications

References 4 publications

Seismology of Azimuthally Anisotropic Media and Seismic Fracture Characterization

Seismology of Azimuthally Anisotropic Media and Seismic Fracture Characterization

Anisotropy and fracture analysis for coalbed methane reservoir development in Bokaro coalfield, India

Use of Pressure/Rate Deconvolution To Estimate Connected Reservoir-Drainage Volume in Naturally Fractured Unconventional-Gas Reservoirs From Canadian Rockies Foothills

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