Bulletin Article

 

Analog outcrops are commonly used to develop predictive reservoir models and provide quantitative parameters that describe the architecture and facies distribution of sedimentary deposits at a subseismic scale, all of which aids exploration and production strategies. The focus of this study is to create a detailed geological model that contains realistic reservoir parameters and to apply nonlinear acoustic full-waveform prestack seismic inversion to this model to investigate whether this information can be recovered and to examine which geological features can be resolved by this process.

Outcrop data from the fluviodeltaic sequence of the Book Cliffs (Utah) are used for the geological and petrophysical two-dimensional model. Eight depositional environments are populated with average petrophysical reservoir properties adopted from a North Sea field. These units are termed lithotypes here. Synthetic acoustic prestack seismic data are then generated with the help of an algorithm that includes all internal multiples and transmission effects. A nonlinear acoustic full-waveform inversion is then applied to the synthetic data, and two media parameters, compressibility (inversely related to the square of the compressional wave velocity vP) and bulk density, ρ, are recovered at a resolution higher than the shortest wavelength in the data. This is possible because the inversion exploits the nonlinear nature of the relationship between the recorded data and the medium contrast properties. In conventional linear inversion, these details remain masked by the noise caused by the nonlinear effects in the data. Random noise added to the data is rejected by the nonlinear inversion, contributing to improved spatial resolution. The results show that the eight lithotypes can be successfully recovered at a subseismic scale and with a low degree of processing artifacts. This technique can provide a useful basis for more accurate reservoir modeling and field development planning, allowing targeting of smaller reservoir units such as distributary channels and lower shoreface sands.

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Explorer Article

 
It’s good to be reminded of this one simple industry fact: “As a rule, geologists love to get out in the field to see classic and interesting outcrops that provide a better understanding of depositional facies, hydrocarbon reservoir systems, and anything related to geology.” That’s AAPG member Mark Longman, this year’s field trip chair for the upcoming AAPG Annual Convention and Exhibition, set May 31-June 3 in Denver.
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Recent debates have flared in the western United States over federal versus state ownership of public lands. Bills concerning the transfer of some public lands to states have been introduced in the U.S. Congress and many western state legislatures, though none have become law.

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Explorer Division Column EMD

 

Every six months, chairs of the Energy Minerals Division committees convene and report on developments in the areas they cover. In this column, we highlight important observations from these recent reports.

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Explorer Emphasis

 
Feisty. Funny. Determined. Competitive. Brilliant. Generous. The words used to describe Harris in advance of her posthumously receiving the AAPG Harrison Schmitt Award at the upcoming ACE in Denver.
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MOOSE – Multiphysics Object-Oriented Simulation Environment – is a software platform designed to make predictive modeling and simulation faster and easier.

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“These days, shows like The Big Bang Theory seem to pass for science content.” That’s Scott Sampson, one of this year’s AAPG Geosciences in the Media Award winners.
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As the Bakken, Eagle Ford, Marcellus and other shale plays make national news, the Cane Creek reservoir might be the dark horse poised to emerge as another major shale play. 

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Explorer Policy Watch

 
Over the course of four months the House Natural Resources Committee, chaired by Doc Hastings (R-Wash.), or its Energy and Mineral Resources Subcommittee, chaired by Doug Lamborn (R-Colo.), hosted seven hearings celebrating energy education and employment.
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Field Seminar

Grand Junction Colorado United States 23 September, 2015 30 September, 2015 86
 
Grand Junction, Colorado, United States
23-30 September 2015

Participants will learn through the use of spectacular outcrops, subsurface datasets, and stratigraphic modeling how these systems tracts and key surfaces (flooding surfaces and sequence boundaries) may be recognized.

Salt Lake City Utah United States 20 September, 2015 27 September, 2015 151
 
Salt Lake City, Utah, United States
20-27 September 2015

Participants will learn a specific and comprehensive methodology for finding and developing conventional and unconventional oil and gas resources associated with lake deposits. The seminar will start with the Quaternary Bonneville basin in Utah, to build familiarity with lacustrine depositional processes. Participants then examine world-famous exposures of organic-rich mudstone, fluvial sandstone, and carbonate microbialite facies in Wyoming.

Salt Lake City Utah United States 02 October, 2015 09 October, 2015 49
 
Salt Lake City, Utah, United States
2-9 October 2015

The seminar focuses on the lithologic variations that characterize clastic reservoir facies and on development of models that can be used to predict these variations in the subsurface.

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