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Title: Poroelastic and Permeability Changes Observed in the Arbuckle Group Near Cushing

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Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
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Conference: Presented at: Seismlogical Society of America: Eastern Section, Norman, OK, United States, Oct 09 - Oct 12, 2017
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United States

Citation Formats

Cochran, E S, Kroll, K A, Richards-Dinger, K B, White, J A, and Murray, K E. Poroelastic and Permeability Changes Observed in the Arbuckle Group Near Cushing. United States: N. p., 2017. Web.
Cochran, E S, Kroll, K A, Richards-Dinger, K B, White, J A, & Murray, K E. Poroelastic and Permeability Changes Observed in the Arbuckle Group Near Cushing. United States.
Cochran, E S, Kroll, K A, Richards-Dinger, K B, White, J A, and Murray, K E. 2017. "Poroelastic and Permeability Changes Observed in the Arbuckle Group Near Cushing". United States. doi:.
title = {Poroelastic and Permeability Changes Observed in the Arbuckle Group Near Cushing},
author = {Cochran, E S and Kroll, K A and Richards-Dinger, K B and White, J A and Murray, K E},
abstractNote = {},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2017,
month =

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  • In porous reservoir rocks permeability may show strong anisotropy due to fractures of thin layering. The authors discuss the influence of anisotropic permeability on seismic velocities and attenuation. To model the wave propagation in the reservoir they use Biot-theory (1956, 1962) for homogeneous media. The complex reservoir therefore appears as an effective medium. The effects of fractures or layers are thus assumed to be only anisotropy of the poroelastic frame and of the permeability. Choosing Biot-theory as basis means that they consider only effects of global fluid flow. For the seismic frequency range up to {approx} 100 Hz they discussmore » all velocity and attenuation effects analytically, for frequencies up to 10 kHz they show numerical results. They find that for seismic frequencies the velocity anisotropy is dominated by poroelastic static anisotropy, whereas attenuation is strongly influenced by anisotropic permeability, leading to directional attenuation. For frequencies of more than {approx} 1 kHz, permeability anisotropy of one order of magnitude affects the velocities significantly, whereas attenuation anisotropy becomes remarkably smaller than in the seismic frequency range.« less
  • Schoenberg's Linear-slip Interface (LSI) model for single, compliant, viscoelastic fractures has been extended to poroelastic fractures for predicting seismic wave scattering. However, this extended model results in no impact of the in-plane fracture permeability on the scattering. Recently, we proposed a variant of the LSI model considering the heterogeneity in the in-plane fracture properties. This modified model considers wave-induced, fracture-parallel fluid flow induced by passing seismic waves. The research discussed in this paper applies this new LSI model to heterogeneous fractures to examine when and how the permeability of a fracture is reflected in the scattering of seismic waves. Frommore » numerical simulations, we conclude that the heterogeneity in the fracture properties is essential for the scattering of seismic waves to be sensitive to the permeability of a fracture.« less
  • The Arbuckle Group of southern Oklahoma displays the only complete exposure of the shallow-water carbonates that characterize the Lower Ordovician of interior North America. Trilobites have been described from some parts of this sequence and sporadic occurrences of other invertebrates are known, but much of the sequence is sparingly fossiliferous. As a consequence, these magnificent exposures have not contributed notably to continuing efforts toward development of a comprehensive biostratigraphic scheme for the Lower Ordovician of the North American platform. Samples collected at 25-ft intervals through the Arbuckle Group along and adjacent to Interstate Highway 35 on the south flank ofmore » the Arbuckle anticline near Ardmore, Oklahoma, produced conodonts in abundances ranging from a few tens to over a thousand elements per kilogram and displaying good to excellent preservation with low CAI. These conodonts document a biostratigraphic continuum that provides a standard for correlation of Lower Ordovician rocks in the subsurface of central US and of the many localized and incomplete outcrops of generally equivalent strata in the Ozark and Upper Mississippi Valley regions. The stratigraphic continuity of the collections makes the I-35 section an ideal standard reference section for graphic correlation of Lower Ordovician rocks containing conodonts of the Mid-Continent Province.« less
  • The upper Arbuckle Group of southern Oklahoma is composed of a thick sequence of carbonates deposited in shallow, epicontinental seas. Several concentrations of quartz sandy detritus, two of which are significant markers in outcrop, are found in the Kindblade and Cool Creek Formations. Both units are composed of varying amounts of quartz sand, ooids, peloids, clasts, and micrite matrix cemented by calcite, silica, and minor dolomite. After a complex postdepositional history of burial, tectonism, and uplift, removal of overburden resulted in relaxation of compressive forces and the development of microfractures between and within grains in the mixed mineralogy units. Equidimensionalmore » voids formed around the outer edges of syntaxial quartz overgrowths as calcite spar separated from silica spar. Relatively thin cortices pulled away from large nuclei resulting in spherical voids within ooids. Multiple microfractures in the radial cortices connect the inner spherical pores to interparticle porosity. A system of microfractures between crystal boundaries in the calcite cement links the pores. Porosity development varies laterally within the quartz sandy, oolitic units and is, in part, dependent on the original burial depth and the amount of overburden removed. Microfractures in subsurface units, if present, may not be as well developed. Alternatively, microfracturing may be enhanced as a result of subsurface dissolution.« less