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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 Article By Barry Friedman

Another Cal Teacher Gets Award

For the third time in six years, AAPG's Teacher of the Year hails from Southern California.

Added on 01 March, 2005

Explorer Article

Levorsen Awardees Announced

Levorsen Award winners, honored for presenting the best paper at an AAPG Section meeting, have been announced by various Sections.

Added on 01 January, 2005

Explorer Foundation Update

Reid Funds to Assist Scouts, Dibblee Maps

Two new AAPG Foundation funds have been established by and in honor of former AAPG president and Foundation trustee Eugene F. Reid.

Added on 01 July, 2004

Explorer Emphasis Article By Kathy Shirley

Storing and Harvesting Massive Data Sets

Three-D seismic and the explosion of processing techniques that have continually made the data more useful are a vital part of today’s exploration and production projects — but this proliferation has created a problem for oil companies: What to do with all that data?

Added on 01 June, 2004

Explorer Director’s Corner By Rick Fritz

Opportunities Are Knocking in '04

We are starting our busy time of year for AAPG

Added on 01 February, 2004

Explorer Emphasis Article By Kathy Shirley

Ocean 'Layer Zero' Valued

You know all that water that makes offshore seismic operations so ... inconvenient? A new application is allowing scientists to use that same seismic to study the 'layers' of that same water -- and the benefits could go far beyond the world of oil.

Added on 01 October, 2003

Explorer Article

Lecture Program Ready to Roll

A world at war, a deadly epidemic of global proportions and other catastrophic events teamed up to disrupt in part AAPG’s Distinguished Lecture program last year -- but the train is back on track.

Added on 01 September, 2003

Explorer Article By Larry Nation

Another Day That Lives in Infamy

December 7, 1941 is a day that lives in infamy. But January 29, 1969 is another date that was made infamous, due to the Santa Barbara Channel oil spill that changed the course of exploration history.

Added on 01 June, 2003

Explorer Article By Jim Hendon

Friendly Geology, Tough Crowd

Fighting the 'good fight' ... this geologist helps the environmentally conscious understand her job.

Added on 01 June, 2003

Explorer Article By Larry Nation

Winning Minds by Winning Hearts

Is it possible for an oil company to survive — and even thrive — in a place where people don't like the oil industry? Before answering, consider the case of California-based Venoco.

Added on 01 June, 2003

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

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

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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