Canyon Sandstones--A Geologically Complex Natural Gas Play in... Val Verde Basin, Southwest Texas

Hamlin, H. Scott; Clift, Sigrid J.; Dutton, Shirley P.; Hentz, Tucker F.; Laubach, Stephen E.

doi:10.23867/ri0232d

Cited by 5 publications

(4 citation statements)

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“…The first synorogenic deposition was a thin, organic-rich black shale, which overlies the Strawn and represents an extended period of starved basin conditions in the late Pennsylvanian (Rall and Rall, 1958) (Figure 2). The black shale is overlain by slope and basin strata of the Canyon intervals (Hamlin et al, 1995). The Ozona forms the uppermost part of the synorogenic fill ( Figure 2).…”

Section: Regional Settingmentioning

confidence: 99%

“…The Ozona play concept (linear trends of sandstone in syndepositional foredeeps) is especially valid for Val Verde County. To the west in Terrell County, Wolfcamp gas production is related to thrusted structures (Montgomery, 1996), and to the east in Edwards County, production is mainly an extension of the Sonora trend of slope sandstones adjacent to the Eastern shelf (Hamlin et al, 1995) (Figure 1). Deep wells reveal the presence of thick sandstones in Val Verde County north of the thrust belt, but established production is limited (Figure 1).…”

Section: Implications For Explorationmentioning

confidence: 99%

“…Productivity depends more on reservoir quality than on structural position, and reservoir quality is controlled by both depositional and postdepositional processes. Original porosity and permeability were mostly destroyed by compaction and by cementation with quartz and carbonate minerals (Hamlin et al, 1995;Dutton et al, 1996). Natural fractures also influence productivity (Marin et al, 1993;Hentz, 1995).…”

Section: Introductionmentioning

confidence: 99%

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Ozona sandstone, Val Verde Basin, Texas: Synorogenic stratigraphy and depositional history in a Permian foredeep basin

Hamlin¹

2009

Bulletin

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The Ozona sandstone is a record of Permian synorogenic sedimentation in a foreland basin. The Ozona comprises terrigenous clastic slope and basin systems overlain by mixed clastic-carbonate shelf-ramp systems. Ozona sandstones form low-permeability gas reservoirs in Crockett County, Texas. I used wire-line logs and cores to map Ozona genetic stratigraphy and to reconstruct the depositional and tectonic history during the final phase of the Ouachita orogeny. Ozona depositional systems are composed of sandy turbidite channel and lobe genetic facies enclosed in laterally extensive muddy turbidite sheets and hemipelagic drapes. Channel and lobe complexes and turbidite sheets together form basin-floor apron systems. Coeval slope systems are mud-dominated products of mass transport processes. Sediment dispersal systems evolved from point sourced to line sourced. Ozona sequence development was primarily controlled by tectonic uplift and subsidence. Stratal geometries, facies associations, sediment input patterns, and depocenter locations are stable within sequences, but they change across sequence boundaries in response to tectonically driven changes in basin geomorphology. Onlapping stratal geometries in the lower sequence record excess accommodation space in the study area as plate convergence progressed from south to north. Offlapping strata in the middle and upper sequences formed in response to reduced accommodation space and intraforeland uplift in the north. At the base of each sequence,

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Section: Regional Settingmentioning

confidence: 99%

Section: Implications For Explorationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Ozona sandstone, Val Verde Basin, Texas: Synorogenic stratigraphy and depositional history in a Permian foredeep basin

Hamlin¹

2009

Bulletin

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“…The major producing horizon in the field is the Canyon formation. These sands are complex turbidite deposits characterized by lenticular gas-bearing members at depths of 6,000 to 7,500 ft. 1 Most wells are air drilled in 5 to 7 days and logged with gamma ray and temperature tools. Typical completions require fracture treatments using water-based fluids containing 50,000 to 250,000 lbm of 20/40 sand.…”

Section: Introductionmentioning

confidence: 99%

A Statistical Approach to Infill-Drilling Studies: Case History of the Ozona Canyon Sands

Cipolla

Wood

1996

SPE Reservoir Engineering

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This paper details the application of limited single-well reservoir modeling to predict infill-drilling potential in tight gas fields. Distributions of ultimate recovery and drainage area were developed from a small sample set to estimate incremental reserves. A case history from the Ozona gas field, Crockett County, TX, illustrates this technique. Fifty-one wells were randomly selected from more than 1,500 producing wells to estimate the potential of 40-acre infill drilling. The distributions of production characteristics from the modeled wells reproduced those of the "full field." Calculated drainage areas ranged from less than 10 acres to more than 320 acres, with a median drainage area of 36 acres. Approximately 75% of Ozona Canyon wells drain less than 80 acres (current spacing), with 52% draining less than 40 acres. The statistical drainage area and estimated ultimate recovery (EUR) data were combined to estimate the potential reserve growth with 40-acre development. Approximately 1,125 locations, adding 400 Bcf of incremental reserves were identified. The average EUR for 40-acre infill wells is 353 MMcf of gas.

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Two-dimensional imaging of elastic properties of rock core samples from measurements of angle-dependent ultrasonic reflection coefficients

Olszowska,

Gallardo-Giozza,

Torres-Verdín

2024

GEOPHYSICS

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Laboratory and field measurements often fail to identify small-scale variations in rock elastic properties. Due to limited spatial resolution, conventional laboratory methods cannot properly describe rock formations exhibiting a high degree of heterogeneity, thereby masking differences between stiff and compliant layers. Continuous sample measurements can mitigate this problem but are not widely used by the industry. We build upon our previous work and apply laboratory angle-dependent ultrasonic reflection coefficient (ADURC) measurements to achieve detailed two-dimensional descriptions of the elastic properties of complex rock samples. This method successfully yields high-resolution information on P- and S-wave velocities, as well as bulk density, across the surface of rock samples. Elastic properties are estimated using a nonlinear inversion algorithm that matches laboratory measurements with numerical simulations. Angle-dependent ultrasonic reflection coefficient data acquired at various sample locations enable detailed rock descriptions, where the effective measurement area is determined by the size of the receiver, measurement frequency, and incidence angle. Consequently, the sampling area is smaller compared to triaxial loading and acoustic transmission tests, where the resolution is controlled by sample size. Measurements conducted on samples exhibiting different levels of spatial complexity validate the capability of the ADURC method to identify small-scale heterogeneities. For the reported experiments, variations in angle-dependent reflectivity give rise to corresponding variations in the estimated P- and S-wave velocities and density which can exceed 60%. These small-scale variations across heterogeneous rock samples are often overlooked by conventional laboratory methods.#xD;#xD;

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Canyon Sandstones--A Geologically Complex Natural Gas Play in... Val Verde Basin, Southwest Texas

Cited by 5 publications

References 0 publications

Ozona sandstone, Val Verde Basin, Texas: Synorogenic stratigraphy and depositional history in a Permian foredeep basin

Ozona sandstone, Val Verde Basin, Texas: Synorogenic stratigraphy and depositional history in a Permian foredeep basin

A Statistical Approach to Infill-Drilling Studies: Case History of the Ozona Canyon Sands

Two-dimensional imaging of elastic properties of rock core samples from measurements of angle-dependent ultrasonic reflection coefficients

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