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Coast Guard: Crude Oil Spilled in California Leak is Only a Fraction of Original Believed - 15 October, 2021 07:31 AM

Jane Fonda to Push for End to Offshore Oil Drilling in California - 14 October, 2021 07:32 AM

California's Justice Department Now Investigating Oil Spill Cause - 13 October, 2021 07:31 AM

Southern California Beach Set to Reopen After Oil Spill - 11 October, 2021 07:33 AM

Huntington Beach and Oil Were Synonymous for Decades. Those Days Are Long Gone. - 11 October, 2021 07:32 AM

News in Review ...

Explorer Emphasis Article By Louise Durham

Polish Your Workstation Skills

Technical training center offers a place for geoscientists to brush up their computer skills.

Added on 01 June, 2003

Explorer Emphasis Article By Kathy Shirley

Spain Outcrops Hold Deep Secrets

Outcrops in Spain that may hold secrets to understanding deepwater reservoirs are providing new clues to scientists, thanks largely to new 3-D laser technologies.

Added on 01 June, 2003

Explorer Article By Larry Nation

Petrol Course Gets Ovations

Rock Star? Norm Hyne's teaching gives a new meaning to the phrase.

Added on 23 April, 2003

Explorer Article

New Book Takes Reservoir Focus

While the technology to drill a horizontal well has been with us a long time, asset teams now have the background to consider the geology in planning to maximize the reservoir.

Added on 01 March, 2003

Explorer Emphasis Article By Kathy Shirley

New Madrid Study Sheds New Light

A recent geologic study may shed light on the New Madrid, a mid-western U.S. seismic zone that is much discussed but little understood.

Added on 01 March, 2003

Explorer Article By Louise Durham

Sanchez Has 'To-Do' List for Government

'This country faces an ongoing threat of an energy crisis that will only get worse if we don't take steps soon to shore up the domestic energy inventory.'

Added on 01 October, 2002

Explorer Emphasis Article By Louise Durham

Gulf Holds a Whale of a Difficulty

A whale of a tale: New federal edicts regarding seismic acquisition in the Gulf of Mexico, intended to protect marine life, could limit where and when data is collected.

Added on 01 September, 2002

Explorer Article By Larry Nation

Preservation Pitch Hits the Mark

A report calling for immediate action to preserve and make available U.S. geoscience collections and data gets a 'positive reception' in Washington.

Added on 01 July, 2002

Explorer Article By Susan Eaton

'I Felt Like a Geology Ambassador'

What would compel a geologist to give up a well-earned university sabbatical or dust off a rock hammer and come out of retirement to spend three months alone mapping the geology of some of America's most remote and rugged national parks and national forests?

Added on 01 June, 2002

Explorer Geophysical Corner By Kathy Shirley

Gas Faces Unconventional Future

What was once unconventional can become commonplace. Remember when fixing a lunch in a microwave oven was rare?

Added on 01 May, 2002

VG Abstract By Sherilyn Williams-Stroud

Fracture Mechanics Interpreted from Stress Inversion Analysis on Microseismic Event Source Mechanisms in the Marcellus Shale

Analysis of microseismicity induced by hydraulic fracture stimulation in the Marcellus Shale shows changes in stress state for different zones of failure. During the treatment, shear failure occurs on both the J1 and J2 fracture orientations in response to different maximum stress orientations, indicating localized changes in the orientation during the treatment. Reactivation of a fault near the wellbore is associated with failure mechanisms with a higher volumetric component, indicating possible inflation of faults and fractures by the introduction of the slurry. Quantification of the stress conditions that are associated with inflation could potentially be used to optimize the stimulation by identifying which fractures will preferentially take on slurry volume.

Request a visit from Sherilyn Williams-Stroud!

Added on 16 November, 2016

VG Abstract By Sherilyn Williams-Stroud

A Brief History of Hydraulic Fracturing and Induced Seismicity

Hydraulic fracturing has been around for decades. This talk describes some of the first applications of the technology, how it developed over time, and our current understanding of its impacts with some discussion of both water and earthquake hazards.

Request a visit from Sherilyn Williams-Stroud!

Added on 16 November, 2016

VG Abstract By Sherilyn Williams-Stroud

Induced Hydraulic Fractures or Reactivated Natural Fractures?

Microseismicity induced by hydraulic fracture stimulation of a horizontal well was mapped with a near-surface buried array. Distinct linear trends of events were not parallel to the direction of fast shear wave polarization measured in the reservoir with a crossed-dipole anisotropy tool. Analysis of core from a nearby well revealed numerous calcite-filled fractures that did not induce shear wave polarization, but did significantly impact the failure behavior of the reservoir rock during the stimulation treatment. Hydraulic fracture simulation with DFN modeling and source mechanism analysis supports the interpretation of reactivated existing fractures rather than the formation of hydraulically-induced tensile fractures.

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