Depostional Environment and Sequence Stratigraphy of the Pennsylvanian Morrowan and Atokan Intervals at the Farnworth Unit, Ochiltree County Texas

Rose-Coss, Dylan; Cather, Martha; Mozley, Peter S.; Balch, Robert

doi:10.1130/abs/2016am-286365

Cited by 7 publications

(11 citation statements)

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“…Tectonic activities including the creation of folds and faults of the Ouachita-fold belt, Cimarron arch, Apishapa, Nemaha and Amarillo Wichita upliftment, and Arkoma basin subsidence [23,24] are of the Wichita orogeny (caused by the North-American plate colliding with the South-American plate through the Morrowan to Des Moinesian period). Others interpret it to be caused by the generation of stress through the southwestern Laurentia margin [23,24]. Past studies interpret Morrow sands in north-west Anadarko deposit to be fluvial [19,[25][26][27][28].…”

Section: The Farnsworth Unit-lithostratigraphic and Geological Settingsmentioning

confidence: 99%

“…However, the authors of [29,30] suggested incised valley infill through regression and further transgression. The depositional environment for the Atokan Thirteen Finger Limestone, in contrast to Morrowan sands and shales, was estuarine to marginal marine with coals, and mudstones intercalated with limestones forming the major lithology [23,30].…”

Section: The Farnsworth Unit-lithostratigraphic and Geological Settingsmentioning

confidence: 99%

“…According to extensive geological studies conducted in previous years [17,23,24,32], there have been a series of diagenetic events that impacted the physical and chemical characteristics of the Anadarko basin. The chronological series of diagenesis is researched to be in the order: cementation of siderite, over-growth of quartz and feldspar, calcite and ankerite cementation, feldspar replaced by ankerite and calcite, compaction, dissolution of feldspar, precipitation of authigenic clays and emplacement of hydrocarbons.…”

Section: Diagenesismentioning

confidence: 99%

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Mechanisms of Waterflood Inefficiency: Analysis of Geological, Petrophysical and Reservoir History, a Field Case Study of FWU (East Section)

Morgan,

Ampomah,

Grigg

et al. 2024

Energies

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The petroleum reservoir represents a complex heterogeneous system that requires thorough characterization prior to the implementation of any incremental recovery technique. One of the most commonly utilized and successful secondary recovery techniques is waterflooding. However, a lack of sufficient investigation into the inherent behavior and characteristics of the reservoir formation in situ can result in failure or suboptimal performance of waterflood operations. Therefore, a comprehensive understanding of the geological history, static and dynamic reservoir characteristics, and petrophysical data is essential for analyzing the mechanisms and causes of waterflood inefficiency and failure. In this study, waterflood inefficiency was observed in the Morrow B reservoir located in the Farnsworth Unit, situated in the northwestern shelf of the Anadarko Basin, Texas. To assess the potential mechanisms behind the inefficiency of waterflooding in the east half, geological, petrophysical, and reservoir engineering data, along with historical information, were integrated, reviewed, and analyzed. The integration and analysis of these datasets revealed that several factors contributed to the waterflood inefficiency. Firstly, the presence of abundant dispersed authigenic clays within the reservoir, worsened by low reservoir quality and high heterogeneity, led to unfavorable conditions for waterflood operations. The use of freshwater for flooding exacerbated the adverse effects of sensitive and migratory clays, further hampering the effectiveness of the waterflood. In addition to these factors, several reservoir engineering issues played a significant role in the inefficiency of waterflooding. These issues included inadequate perforation strategies due to the absence of detailed hydraulic flow units (HFUs) and rock typing, random placement of injectors, and uncontrolled injected fresh water. These external controlling parameters further contributed to the overall inefficiencies observed during waterflood operations in the east half of the reservoir. A detailed understanding of the mechanistic factors of inefficient waterflood operation will provide adequate insights into the development of the improved recovery technique for the field.

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Section: The Farnsworth Unit-lithostratigraphic and Geological Settingsmentioning

confidence: 99%

Section: The Farnsworth Unit-lithostratigraphic and Geological Settingsmentioning

confidence: 99%

Section: Diagenesismentioning

confidence: 99%

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Mechanisms of Waterflood Inefficiency: Analysis of Geological, Petrophysical and Reservoir History, a Field Case Study of FWU (East Section)

Morgan,

Ampomah,

Grigg

et al. 2024

Energies

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“…The target formation, Morrow B, is highly heterogeneous due in part to dispersed clay deposited during its diagenetic evolution. 31,32 Several studies have shown the unpredictable impacts of clay content on the Biot-Gassmann workflow results. [33][34][35] Consequently, the appropriate implementation of Biot Gassmann requires the development of a relationship between the properties of the rocks' composite grains and the rock frame, aptly expressed through the Biot poroelastic coefficient (Eqn 7), 36,37 K fr = (1 − α) K s (7) This study benefits from a site-specific Krief rock physics model.…”

Section: Seismic Velocity: Impact Of Fluid Substitutionmentioning

confidence: 99%

“…An additional assumption is that the acoustic waves propagate through the formation at low frequencies such that the seismic waves do not trigger pressure disequilibration within the pore spaces. The target formation, Morrow B, is highly heterogeneous due in part to dispersed clay deposited during its diagenetic evolution 31,32 . Several studies have shown the unpredictable impacts of clay content on the Biot‐Gassmann workflow results 33–35 .…”

Section: Theorymentioning

confidence: 99%

Time‐lapse VSP integration and calibration of subsurface stress field utilizing machine learning approaches: A case study of the morrow B formation, FWU

et al. 2023

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This study aims to develop a methodology for calibrating subsurface stress changes through time‐lapse vertical seismic profiling (VSP) integration. The selected study site is a region around the injector well located within Farnsworth field unit (FWU), where there is an ongoing CO2‐enhanced oil recovery (EOR) operation. In our study, a site‐specific rock physics model was created from extensive geological, geophysical, and geomechanical characterization through 3D seismic data, well logs, and core assessed as part of the 1D MEM conducted on the characterization well within the study area. The Biot‐Gassmann workflow was utilized to combine the rock physics and reservoir simulation outputs to determine the seismic velocity change due to fluid substitution. Modeled seismic velocities attributed to mean effective stress were determined from the geomechanical simulation outputs, and the stress‐velocity relationship developed from ultrasonic seismic velocity measurements. A machine learning‐assisted workflow comprised of an artificial neural network and a particle swarm optimizer (PSO) was utilized to minimize a penalty function created between the modeled seismic velocities and the observed time‐lapse VSP dataset. The successful execution of this workflow has affirmed the suitability of acoustic time‐lapse measurements for 4D‐VSP geomechanical stress calibration pending measurable stress sensitivities within the anticipated effective stress changes and the availability of suitable and reliable datasets for petroelastic modeling. © 2023 Society of Chemical Industry and John Wiley & Sons, Ltd.

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Associated Storage With Enhanced Oil Recovery

Balch

McPherson

2022

Geophysical Monograph Series

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Depostional Environment and Sequence Stratigraphy of the Pennsylvanian Morrowan and Atokan Intervals at the Farnworth Unit, Ochiltree County Texas

Cited by 7 publications

References 0 publications

Mechanisms of Waterflood Inefficiency: Analysis of Geological, Petrophysical and Reservoir History, a Field Case Study of FWU (East Section)

Mechanisms of Waterflood Inefficiency: Analysis of Geological, Petrophysical and Reservoir History, a Field Case Study of FWU (East Section)

Time‐lapse VSP integration and calibration of subsurface stress field utilizing machine learning approaches: A case study of the morrow B formation, FWU

Associated Storage With Enhanced Oil Recovery

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