Environmental Geosciences Article

 
Upward migration of brine because of pressurization resulting from injection is a risk of disposal of water produced with oil and geologic carbon storage. Analysis of the net production in each zone associated with oil production activities in the southern San Joaquin Valley, California, determined that net injection caused by disposal of water produced with oil occurred in zones above the shallowest zone with net production in several oil fields.
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Explorer Article

 

AAPG’s Memoir 111 “3-D Structural Interpretation: Earth, Mind, and Machine” will be released this month. The volume is one of the first to compare perspectives of geologic interpretation from industry and academic practitioners, with consideration of how 3-D cognitive skills impact what geologists think and do.

American Association of Petroleum Geologists (AAPG)
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Ongoing drought conditions in the Pacific Section affect everybody, especially the oil industry.

American Association of Petroleum Geologists (AAPG)
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Explorer Division Column DPA

 

In the past eight months, our industry has continued to be challenged by low commodity prices resulting in difficult times for many geoscientists in our industry. To everyone who has been affected and to those of you who are concerned that you will be, remember to stay focused and be optimistic about your future.

American Association of Petroleum Geologists (AAPG)
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Explorer Emphasis

 

Oil companies and environmentalists are popularly – albeit inaccurately – perceived as natural enemies by the general public. But, the marine life dwelling offshore California and other oil-producing locales knows nothing of this supposed antagonism. All they know are the drilling rigs where they thrive.

American Association of Petroleum Geologists (AAPG)
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Explorer Historical Highlight

 

When Occidental Petroleum Corporation was reorganized in 1959, its total oil production was some 100 barrels per day. By the time Moammar Gaddaffi nationalized the industry in 1969, Oxy Libya, the wholly owned subsidiary, was producing 800,000 barrels per day. Such an amount made Oxy Libya the eighth largest producer in the world.

American Association of Petroleum Geologists (AAPG)
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Explorer ProTracks

 

The Pacific Section’s Young Professionals Special Interest Group is working to be more involved and active in the wake of the current industry environment.

American Association of Petroleum Geologists (AAPG)
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VG Abstract

 

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.

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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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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.

American Association of Petroleum Geologists (AAPG)
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