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Read the 2014 Newsletter - A tradition since 1950, the Newsletter highlights research, news and achievements by Jackson School faculty, students, scientists and alumni

Read the 2014 Newsletter

A tradition since 1950, the Newsletter highlights research, news and achievements by Jackson School faculty, students, scientists and alumni

Video: GeoFORCE - Changing lives since 2005

Video: GeoFORCE

Changing lives since 2005

Video: Unveiling Earth's Surface - Airborne lidar at the Jackson School's Bureau of Economic Geology

Video: Unveiling Earth's Surface

Airborne lidar at the Jackson School's Bureau of Economic Geology

Video: New Stash of Ice Age Fossils

Video: New Stash of Ice Age Fossils

Video: Fire, Ice & Huge Quantity of Potential Energy - Researchers at the Jackson School of Geosciences are leading a project to learn more about frozen methane under the Gulf of Mexico

Video: Fire, Ice & Huge Quantity of Potential Energy

Researchers at the Jackson School of Geosciences are leading a project to learn more about frozen methane under the Gulf of Mexico

The Miracle of Flight - A graduate student discovers the largest flying animal in history: the Texas Pterosaur

The Miracle of Flight

A graduate student discovers the largest flying animal in history: the Texas Pterosaur

Risk of Amazon Rainforest Dieback is Higher Than IPCC Projects

Risk of Amazon Rainforest Dieback is Higher Than IPCC Projects

  Scientists using ice-penetrating radar data collected by NASA’s Operation IceBridge and earlier airborne campaigns have built the first comprehensive map of layers deep inside the Greenland Ice Sheet, opening a window on past climate conditions and the ice sheet’s potentially...

JAN
26

Soft Rock Seminar - Dr. Jon Blundy, University of Bristol
12:00 PM

Soft Rock Seminar - Dr. Jon Blundy, University of Bristol

  Start: January 26, 2015 at 12:00 pm     End: January 26, 2015 at 1:00 pm
 Location:JGB 3.222

JAN
27

Tech Sessions Speaker Series: PhD Talk
4:00 PM

Soft Rock Seminar - Dr. Jon Blundy, University of Bristol

  Start: January 26, 2015 at 12:00 pm     End: January 26, 2015 at 1:00 pm
 Location:JGB 3.222

Tech Sessions Speaker Series: PhD Talk

  Start: January 27, 2015 at 4:00 pm     End: January 27, 2015 at 5:00 pm

JAN
29

Tech Sessions Speaker Series: Peter Flemings
4:00 PM

Soft Rock Seminar - Dr. Jon Blundy, University of Bristol

  Start: January 26, 2015 at 12:00 pm     End: January 26, 2015 at 1:00 pm
 Location:JGB 3.222

Tech Sessions Speaker Series: PhD Talk

  Start: January 27, 2015 at 4:00 pm     End: January 27, 2015 at 5:00 pm

Tech Sessions Speaker Series: Peter Flemings

  Start: January 29, 2015 at 4:00 pm     End: January 29, 2015 at 5:00 pm

JAN
30

BEG Friday Seminar Series
9:00 AM

Soft Rock Seminar - Dr. Jon Blundy, University of Bristol

  Start: January 26, 2015 at 12:00 pm     End: January 26, 2015 at 1:00 pm
 Location:JGB 3.222

Tech Sessions Speaker Series: PhD Talk

  Start: January 27, 2015 at 4:00 pm     End: January 27, 2015 at 5:00 pm

Tech Sessions Speaker Series: Peter Flemings

  Start: January 29, 2015 at 4:00 pm     End: January 29, 2015 at 5:00 pm

BEG Friday Seminar Series

  Start: January 30, 2015 at 9:00 am     End: January 30, 2015 at 10:00 am
 Location:BEG Main Conference Room; Building 130; PRC Campus
 Contact:Sophia Ortiz, sophia.ortiz@beg.utexas.edu, 512.475.9588
 URL:Event Link
Patrick J. Mickler
Research Associate
Bureau of Economic Geology

Abstract:
An important side effect of hydraulic fracturing (HF) in shale gas wells is the production of saline flow-back water. This water often contains total dissolved solid (TDS) concentrations ?100,000 ppm which requires expensive treatment and disposal of the produced water. Possible origins of the high TDS content include: 1) Mixing of fresh HF-fluids with highly saline pore fluids in the targeted shale. 2) Migration and mixing of saline brines by newly-formed fractures into the HF-water from neighboring formations. 3) Water rock interactions between the targeted shale and HF-water that include mineral dissolution, pyrite oxidation buffered by carbonate dissolution and cation exchange in newly hydrated clay minerals. These possibilities are not mutually exclusive and all may be operating to alter flow-back water chemistry. This study will examine geochemical reactions between shale and manufactured HF-waters using sealed bench top experiments and high temperature/high pressure autoclave experiments. The manufactured HF-waters were produced by mixing NaCl, KCl and CaCl2 salts with De-ionized water. During experiments, elements that show large increases in aqueous concentrations are Na, Cl, Ca and SO4. Simultaneous increases in Na and Cl, coupled with high Cl/Br ratios, suggest halite dissolution rather than pore space brine is responsible for Na and Cl concentrations. Simultaneous increase in Ca and SO4 suggest anhydrite dissolution. SEM imaging shows that anhydrite crystals are usually embedded with the framework mineral grains. Molar comparisons between Na-Cl and Ca-SO4 suggest Ca is preferentially removed from solution and Na is added to solution through interactions with clay minerals. Cation exchange and desorption during clay hydration likely has a secondary effect on the observed geochemical trend. Ca is sorbed and Na is released preferentially resulting in a Ca depletion seen on the Ca vs. SO4 plot and a Na excess seen in the Na vs. Cl plot. Although this study does not consider mixing of HF-water with formation brines, the identified water-rock reactions may provide insights into observed flow-back water chemistry. Overall the addition of friction reducers did not have a significant effect on elemental release amounts. The only exception is the polyacrylamide additive (PAM2) which has a high NH4+ blank that enhanced cation exchange in the clay minerals.


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Distinguished Postdoctoral Fellows Program - Deadline to apply is Dec. 1, 2014
Deadline to apply is Dec. 1, 2014
New Salt Tectonics Complex - Honoring Martin Jackson, raising funds towards a newly renovated Salt Tectonics Modeling Complex
Honoring Martin Jackson, raising funds towards a newly renovated Salt Tectonics Modeling Complex
Geoscience Education - Summit on Future of Undergraduate Geoscience Education: Summary Report & Survey
Summit on Future of Undergraduate Geoscience Education: Summary Report & Survey
GeoFORCE Challenge Match - This endowment has launched to ensure the continuation of this critical program
This endowment has launched to ensure the continuation of this critical program
Work at JSG - The Jackson School is hiring. Apply online.
The Jackson School is hiring. Apply online.
Find a Supervisor - Grad students work with over 70 scientists in 9 research disciplines
Grad students work with over 70 scientists in 9 research disciplines
 
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