Julia Gale

Bureau of Economic Analysis

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Stephen E. Laubach

The University of Texas at Austin

Randall Marrett

The University of Texas at Austin

Leonel Gomez

The University of Texas at Austin

Jon E. Olson

The University of Texas at Austin

Peter Eichhubl

Bureau of Economic Analysis

Robert M. Reed

University of Maryland, Baltimore

N. F. C. Hudson

University of Derby

Michael J. Pyrcz

The University of Texas at Austin

Igor Fernandes Gomes

Universidade Federal da Paraíba

Tiago Siqueira de Miranda

Hospital Sírio-Libanês

Cooperative Institutions

The University of Texas at Austin

Bureau of Economic Analysis

Bureau of Economic Geology

Universidade Federal de Pernambuco

Lamont-Doherty Earth Observatory

Columbia University

Stanford University

Hillenbrand (United States)

University of Derby

Queens College, CUNY

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Aperture-size scaling variations in a low-strain opening-mode fracture set, Cozzette Sandstone, Colorado

Journal of Structural Geology (2009)

John N. Hooker Julia Gale Leonel Gomez Stephen E. Laubach Randall Marrett

Cathodoluminescence

Aperture (computer memory)

10.1016/j.jsg.2009.04.001

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Citations (115)

A CD-based courseware package for the teaching and consolidating of geological field skills

Planet (2002)

Mike Smith N. F. C. Hudson Adrian P. Watson Don Mackenzie Julia Gale

This article explores a CD-based courseware package for the teaching and consolidating of geological field skills used for the interpretation of folding sequences in deformed rocks, focussing on examples from Anglesey in North Wales. The article briefly considers the advantages and disadvantages of virtual fieldwork and then discusses the rationale, structure, development and production of the CD courseware package.

Folding (DSP implementation)

10.11120/plan.2002.00070010

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Citations (3)

Earthquakes in Northwest Louisiana and the Texas–Louisiana Border Possibly Induced by Energy Resource Activities within the Haynesville Shale Play

Seismological Research Letters (2016)

J. I. Walter Peter J. Dotray Cliff Frohlich Julia Gale

Research Article| February 10, 2016 Earthquakes in Northwest Louisiana and the Texas–Louisiana Border Possibly Induced by Energy Resource Activities within the Haynesville Shale Play Jacob I. Walter; Jacob I. Walter aInstitute for Geophysics, University of Texas at Austin, 10100 Burnet Road (R2200), Austin, Texas 78758‐4445 U.S.A.jwalter@ig.utexas.edu Search for other works by this author on: GSW Google Scholar Peter J. Dotray; Peter J. Dotray aInstitute for Geophysics, University of Texas at Austin, 10100 Burnet Road (R2200), Austin, Texas 78758‐4445 U.S.A.jwalter@ig.utexas.edu Search for other works by this author on: GSW Google Scholar Cliff Frohlich; Cliff Frohlich aInstitute for Geophysics, University of Texas at Austin, 10100 Burnet Road (R2200), Austin, Texas 78758‐4445 U.S.A.jwalter@ig.utexas.edu Search for other works by this author on: GSW Google Scholar Julia F. W. Gale Julia F. W. Gale bBureau of Economic Geology, University of Texas at Austin, Austin, Texas 78758‐4445 U.S.A. Search for other works by this author on: GSW Google Scholar Author and Article Information Jacob I. Walter aInstitute for Geophysics, University of Texas at Austin, 10100 Burnet Road (R2200), Austin, Texas 78758‐4445 U.S.A.jwalter@ig.utexas.edu Peter J. Dotray aInstitute for Geophysics, University of Texas at Austin, 10100 Burnet Road (R2200), Austin, Texas 78758‐4445 U.S.A.jwalter@ig.utexas.edu Cliff Frohlich aInstitute for Geophysics, University of Texas at Austin, 10100 Burnet Road (R2200), Austin, Texas 78758‐4445 U.S.A.jwalter@ig.utexas.edu Julia F. W. Gale bBureau of Economic Geology, University of Texas at Austin, Austin, Texas 78758‐4445 U.S.A. Publisher: Seismological Society of America First Online: 14 Jul 2017 Online Issn: 1938-2057 Print Issn: 0895-0695 © 2016 by the Seismological Society of America Seismological Research Letters (2016) 87 (2A): 285–294. https://doi.org/10.1785/0220150193 Article history First Online: 14 Jul 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Jacob I. Walter, Peter J. Dotray, Cliff Frohlich, Julia F. W. Gale; Earthquakes in Northwest Louisiana and the Texas–Louisiana Border Possibly Induced by Energy Resource Activities within the Haynesville Shale Play. Seismological Research Letters 2016;; 87 (2A): 285–294. doi: https://doi.org/10.1785/0220150193 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietySeismological Research Letters Search Advanced Search ABSTRACT We utilize Transportable Array data to survey regional seismicity in east Texas and northwest Louisiana. Through analyst review and a waveform‐matching technique, we identify 58 earthquakes occurring between April 2010 and July 2012. The earthquakes spatially cluster within two main zones, near Timpson, Texas, and within Bienville Parish, Louisiana; minor clusters occur in the Texas–Louisiana border region. Although the Timpson earthquakes have been studied previously, we identify many undetected earthquakes that occurred in 2010, about two years prior to the 17 May 2012 Mw 4.8 earthquake, which has been linked to wastewater injection. The Bienville Parish sequence, which consists of magnitude 0.5–1.9 earthquakes in mid‐ to late‐2011, occurred about 10 km from wells that began injecting at relatively modest rates (∼40,000 barrels (bbl) per month) in late 2010 but within a few kilometers of production wells that were being hydraulically fractured around the same time period. An additional cluster of seismicity was observed, near Center, Texas, with some seismicity occurring in the months prior to the start of wastewater injection and the largest earthquake in that sequence occurring when injection exceeded 200,000 bbl/month; this may be a case in which injection into a seismically active area promoted a larger earthquake. Finally, there was also seismicity observed near the Toledo Bend Reservoir in Louisiana. The evidence concerning some of the sequences indicates they might be associated with either hydraulic fracturing or recent increases in wastewater injection at wells within the unconventional Haynesville shale gas play. The results of this study highlight the need for more extensive seismic monitoring in the central and eastern regions of the United States of America. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.

Cliff

10.1785/0220150193

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Citations (19)

Quantifying opening-mode fracture spatial organization in horizontal wellbore image logs, core and outcrop: Application to Upper Cretaceous Frontier Formation tight gas sandstones, USA

Journal of Structural Geology (2017)

J.Z. Li Stephen E. Laubach Julia Gale Randall Marrett

The Upper Cretaceous Frontier Formation is a naturally fractured gas-producing sandstone in Wyoming. Regionally, random and statistically more clustered than random patterns exist in the same upper to lower shoreface depositional facies. East-west- and north-south-striking regional fractures sampled using image logs and cores from three horizontal wells exhibit clustered patterns, whereas data collected from east-west-striking fractures in outcrop have patterns that are indistinguishable from random. Image log data analyzed with the correlation count method shows clusters ∼35 m wide and spaced ∼50 to 90 m apart as well as clusters up to 12 m wide with periodic inter-cluster spacings. A hierarchy of cluster sizes exists; organization within clusters is likely fractal. These rocks have markedly different structural and burial histories, so regional differences in degree of clustering are unsurprising. Clustered patterns correspond to fractures having core quartz deposition contemporaneous with fracture opening, circumstances that some models suggest might affect spacing patterns by interfering with fracture growth. Our results show that quantifying and identifying patterns as statistically more or less clustered than random delineates differences in fracture patterns that are not otherwise apparent but that may influence gas and water production, and therefore may be economically important.

Outcrop

Tight gas

10.1016/j.jsg.2017.07.005

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Citations (54)

Quantifying aperture, spacing and fracture intensity in a carbonate reservoir analogue: Crato Formation, NE Brazil

Marine and Petroleum Geology (2018)

Tiago Siqueira de Miranda Rafael F. Santos José Antônio Barbosa Igor Fernandes Gomes Márcio Lima Alencar

Outcrop

Stylolite

Carbonate platform

10.1016/j.marpetgeo.2018.07.019

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Citations (59)

Correlation analysis of fracture arrangement in space

Journal of Structural Geology (2017)

Randall Marrett Julia Gale Leonel Gomez Stephen E. Laubach

We present new techniques that overcome limitations of standard approaches to documenting spatial arrangement. The new techniques directly quantify spatial arrangement by normalizing to expected values for randomly arranged fractures. The techniques differ in terms of computational intensity, robustness of results, ability to detect anti-correlation, and use of fracture size data. Variation of spatial arrangement across a broad range of length scales facilitates distinguishing clustered and periodic arrangements—opposite forms of organization—from random arrangements. Moreover, self-organized arrangements can be distinguished from arrangements due to extrinsic organization. Traditional techniques for analysis of fracture spacing are hamstrung because they account neither for the sequence of fracture spacings nor for possible coordination between fracture size and position, attributes accounted for by our methods. All of the new techniques reveal fractal clustering in a test case of veins, or cement-filled opening-mode fractures, in Pennsylvanian Marble Falls Limestone. The observed arrangement is readily distinguishable from random and periodic arrangements. Comparison of results that account for fracture size with results that ignore fracture size demonstrates that spatial arrangement is dominated by the sequence of fracture spacings, rather than coordination of fracture size with position. Fracture size and position are not completely independent in this example, however, because large fractures are more clustered than small fractures. Both spatial and size organization of veins here probably emerged from fracture interaction during growth. The new approaches described here, along with freely available software to implement the techniques, can be applied with effect to a wide range of structures, or indeed many other phenomena such as drilling response, where spatial heterogeneity is an issue.

Position (finance)

Spatial correlation

10.1016/j.jsg.2017.06.012

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Citations (88)

Between Sunda subduction and Himalayan collision: fertility, people and earthquakes on the Ganges-Brahmaputra Delta

AGU Fall Meeting Abstracts (2014)

L. Seeber M. S. Steckler S. H. Akhter S. L. Goodbred Julia Gale

Source

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Natural Fracture Characterization in Aptian Carbonates, Araripe Basin, NE Brazil

Proceedings (2014)

Tiago Siqueira de Miranda José Antônio Barbosa Julia Gale Randall Marrett Igor Fernandes Gomes

Summary This paper addresses fracture characterization in an Aptian laminated limestone, the Crato Formation, cropping out in the Araripe Basin (NE, Brazil) using a scanline technique. This unit has been used as a geological analogue of buried naturally fractured carbonate reservoirs. In recent years, studies of fractured reservoirs have drawn considerable attention due to their significance for oil production and enhanced recovery. The study was based on the use of traditional scanline surveys, and the recording of fracture orientation, morphology, crosscutting relationships, composition, texture of fracture fill, fracture aperture-size distribution (frequency), spatial distribution (coefficient of variation), and strain for each fracture set. The main fractures identified in the Crato Formation were shear- and opening-mode fractures (veins) and with stylolites also present. In this study we focus on opening-mode fractures, which strike in two main directions, NNW-SSW (set 1) and NE-SW (set 2), and are filled by recrystallized calcite. Fractures of set 2 have a wider kinematic aperture and spacing range and are more likely to be clustered than are fractures of set 1 (NE). These results have been used to populate computational models that consider the widespread fracture system in the geomechanical modeling of carbonate reservoirs.

Aptian

Characterization

10.3997/2214-4609.20140622

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Citations (2)

Effects of diagenesis (cement precipitation) during fracture opening on fracture aperture-size scaling in carbonate rocks

Geological Society London Special Publications (2012)

John N. Hooker Leonel Gomez Stephen E. Laubach Julia Gale Randall Marrett

Abstract A correlation is demonstrated between the presence of crack-seal texture and power-law kinematic aperture-size (width) distributions among opening-mode fractures in rocks of dominantly carbonate mineralogy. Crack-seal opening increments (opening-displacement increment sizes or ‘gaps’) within individual fractures follow narrow normal or log-normal size distributions, suggesting that fracture widening accumulates in characteristic (usually micrometre-scale) size increments. The scale invariance in overall fracture width distributions present in some fracture sets most likely arises from grouping of these increments (localization) to form larger fractures (millimetre- to centimetre-scale widths). Such localization could be a consequence of the tendency for larger, less cemented fractures to break preferentially during subsequent deformation. Cement accumulation patterns thus provide a mechanism for positive feedback whereby large-fracture growth exceeds small-fracture growth. Using characteristically sized growth increments, a fracture growth model accurately simulates fracture arrays having power-law fracture-width distributions. Model parameters can be altered to produce characteristic-width fracture size distributions. The results have implications for how fracture porosity and permeability evolve in carbonate reservoirs.

10.1144/sp370.9

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Citations (56)

Aperture size distribution, length, and preferential location of bed-parallel veins in shale

Journal of Structural Geology (2023)

Qiqi Wang Julia Gale

Outcrop

10.1016/j.jsg.2023.104984

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Citations (0)