High-resolution stratigraphy and facies architecture of the Upper Cretaceous (Cenomanian–Turonian) Eagle Ford Group, Central Texas

Fairbanks, Michael D.; Ruppel, Stephen C.; Rowe, Harry

doi:10.1306/12071514187

Cited by 47 publications

(20 citation statements)

References 39 publications

(37 reference statements)

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“…It is also dependent on the pores structures, orientation, and abundance of micro and nano cracks. Our XRD data show that the Eagle Ford outcrop cores used in this study have similar mineralogy to the laminated argillaceous foraminiferal mudrock facies described in the study of Fairbanks (2012). Fig.…”

Section: Core Mineralogysupporting

confidence: 69%

Experimental Investigation on Permeability and Porosity Hysteresis in Low-Permeability Formations

Teklu

Zhou

et al. 2016

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Permeability and porosity decrease with increasing net stress in consolidated and unconsolidated porous media is a well-known phenomenon to petroleum and geomechanics engineers. Conversely, permeability and porosity are observed to increase when net stress decreases, however typically follow a different path, this discrepancy is known as hysteresis. The trend of permeability and porosity hysteresis is a signature of porous medium that depends on several physical and mechanical properties.Understanding permeability and porosity hysteresis plays a significant role in production strategies of hydrocarbon reservoirs. Hysteresis effect on production strategies can be even more important in very low permeability reservoirs such as tight sandstone, tight carbonate, and shale formations. The reason is that the stress change associated with permeability and porosity hysteresis can affect adsorption/desorption and diffusion transport mechanisms which are among the main driving mechanisms in low or ultra-low permeability reservoirs.In this study, permeability and porosity hysteresis of nano, micro, and milli-Darcy core samples are measured for a wide range of net stress and the results are correlated with pore structures observed by Field Emission Scanning Electron Microscopy (FE-SEM) images. The nano and micro-Darcy core samples are from the Niobrara, Bakken, Three Forks, and Eagle Ford formations. The milli-Darcy core samples are from Middle East carbonate, Indiana Limestone, and Torrey Buff Sandstone formations. Bakken, Three Forks, and Middle East carbonate are core samples from oil producing reservoirs, whereas others are from outcrop. Our experimental observations show that: (a) compared to steady state method, the unsteady state permeability measurement used here can shorten the time required to measure permeability of nano and micro-Darcy cores without significant measurement error; (b) stress dependency of permeability and porosity and their hysteresis during loading and unloading of outcrop cores were observed to be very small compared to those of reservoir cores; (c) generally, the stress dependency and hysteresis of permeability and porosity was observed to be inversely related permeability and porosity at initial stress conditions; hence, these characteristics are more pronounced and important in organic rich shale reservoirs; (d) porosity decrease with stress and its hysteresis were observed to be much smaller than that of permeability; (e) our results generally follow the experimental and theoretical relationship between cubic root of permeability and logarithmic of net stress reported by many researchers; and (f) an increase in permeability with temperature (and decrease in permeability with hysteresis during temperature unloading) is observed in organic rich mudrocks. This is due to dilation, diffusion, and adsorption effects of organic rich pores. Hence, a temperature correction factor is required to estimate the exact in-situ permeability of organic rich mudrocks.Finally, we would like to comment that und...

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Section: Core Mineralogysupporting

confidence: 69%

Experimental Investigation on Permeability and Porosity Hysteresis in Low-Permeability Formations

Teklu

Zhou

et al. 2016

All Days

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“…In Mesozoic and younger open water systems, pelagic biogenic production by calcareous organisms has resulted in the deposition of micro-and nannofossil tests and calcareous ooze deposition, preserved as pelagic limestones and chalks in the sedimentary record (Ekdale, 1984). Microfossils, like foraminifera, make up pelagic limestone units, like those found in the Cretaceous aged Eagle Ford, which are interbedded with organic and clay-rich shale beds (Denne et al, 2014;Fairbanks et al, 2016). Nannofossils, specifically coccololithophores, make up chalk deposits.…”

Section: Strata -Sepm Digital Knowledge Database -A New Look At a Popular Tool And Its' Futurementioning

confidence: 99%

Untitled

2018

TSR

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This publication is the result of more than 3 decades of sequence stratigraphy research and application. The objective is to emphasize the most important aspects of Sequence Stratigraphy-a method to guide geologic interpretation of stratigraphic data (seismic profiles, well-logs, cores and outcrops) across scales (from local to regional and global) and depositional environments (from continental to deep marine).The stratigraphic concept of a depositional sequence was introduced to the scientific literature by Peter Vail and his colleagues in the late 70s, building on the shoulders of giants like Chamberlain, Sloss and Wheeler. Since then, several papers compared and contrasted the original sequence-stratigraphic school published in the AAPG Memoir 26 in 1977 with other approaches to subdivide the geologic record, as well as, debating the model validity and impact on the community. At its core, the "model" is really a stratigraphic interpretation method, which was never explicitly documented in the literature. The objective of this book is to present the sequence stratigraphic method in its current form in an attempt to clarify its usage and application in diverse geologic data and depositional environments. This publication is the result of more than 3 decades of sequence stratigraphy research and application. The objective is to emphasize the most important aspects of Sequence Stratigraphy-a method to guide geologic interpretation of stratigraphic data (seismic profiles, well-logs, cores and outcrops) across scales (from local to regional and global) and depositional environments (from continental to deep marine). This book in an 11 x 17 format is designed to be easily used for teaching or self-learning experiences. In the second edition of the "Atlas", the book was divided in 2 separately bound volumes-Exercises and Solutions-to make it easier to use the publication as text book for sequence stratigraphy courses in universities. Also, a new exercise was added and several of the existing exercises went through major updating and editing.

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“…Throughout the study area and the basin, the top-Buda unconformity records a surface of exposure and hiatus but exhibits no clear evidence of erosional truncation on well logs. However, locally in the Austin, Texas, area the uppermost Buda interval is highly brecciated and is interpreted by Fairbanks (2012) to record karsting. The Maness interval consistently comprises a lower, upward-fining (retrogradational) section and an upper, upward-coarsening (progradational) unit (Figure 7) throughout the East Texas basin.…”

Section: Maness Shale Of Washita Groupmentioning

confidence: 99%

Eaglebine play of the southwestern East Texas basin: Stratigraphic and depositional framework of the Upper Cretaceous (Cenomanian—Turonian) Woodbine and Eagle Ford Groups

Hentz¹,

Ambrose²,

Smith³

2014

Bulletin

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High-resolution stratigraphy and facies architecture of the Upper Cretaceous (Cenomanian–Turonian) Eagle Ford Group, Central Texas

Cited by 47 publications

References 39 publications

Experimental Investigation on Permeability and Porosity Hysteresis in Low-Permeability Formations

Experimental Investigation on Permeability and Porosity Hysteresis in Low-Permeability Formations

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Eaglebine play of the southwestern East Texas basin: Stratigraphic and depositional framework of the Upper Cretaceous (Cenomanian—Turonian) Woodbine and Eagle Ford Groups

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