Bulletin Article

3253
 

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.

Explorer Article

8576
 

The technical program is now in place and registrations are being accepted for the second annual Unconventional Resources Technology (URTeC) Conference, which will be held Aug. 25-27 at the Colorado Convention Center in Denver.

8490
 

If you want to know about the Eagle Ford play in Texas, AAPG member Art Donovan is a man you want to be talking to.

8488
 

Orion Skinner, senior explorationist at Whiting Petroleum, is this year’s winner of AAPG’s Norman H. Foster Outstanding Explorer Award.

8049
 

Online registration is open for this year’s AAPG Annual Convention and Exhibition, which will be held April 6-9 at the George R. Brown Convention Center in Houston – and reduced registration fees are still available for those who act fast.

3785
 

Energy is required to secure, treat and distribute water; conversely, energy production depends on an abundant and reliable source of water.

Explorer Division Column EMD

3800
 

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.

Explorer Emphasis

8061
 

Denver’s 20-year-old 3-D Seismic Symposium has grown into an institution by fostering camaraderie and community and by launching careers.

8050
 

Seismic Outlook: After several years of plenty, 2014 is expected to be a comparatively lean year for the seismic industry, a few localized hot-spots around the world notwithstanding.

3169
 

New geosteering tools are helping to drive eye-raising crude oil production levels in the Bakken shale play.

Field Seminar

Great Falls Montana United States 14 July, 2014 19 July, 2014 108
 
Great Falls, Montana, United States
14-19 July 2014

Participants will explore a number of classic geological sites that affected the Lewis and Clark expedition in Montana on this six-day excursion.

Grand Junction Colorado United States 04 September, 2014 11 September, 2014 86
 
Grand Junction, Colorado, United States
4-11 September 2014

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 03 May, 2014 09 May, 2014 49
 
Salt Lake City, Utah, United States
3-9 May 2014

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.

Las Vegas Nevada United States 31 May, 2014 06 June, 2014 101
 
Las Vegas, Nevada, United States
31 May - 6 June 2014

For those who have not visited the region previously (or have not had the chance to tour it in depth), this field seminar will provide a comprehensive journey into the geological story of this fascinating landscape.

Short Course

Denver Colorado United States 03 June, 2014 05 June, 2014 1505
 
Denver, Colorado, United States
3-5 June 2014

Here is an introduction to the tools and techniques that geologists and geophysicists use to locate gas and oil, that drillers use to drill the wells and that petroleum engineers use to test and complete the wells and produce the gas and oil. Exercises throughout the course provide practical experience in well log correlation, contouring, interpretation of surface and subsurface, contoured maps, seismic interpretation, well log interpretation, and decline curve analysis.

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John William Robinson John William Robinson Advisory Counselor (2012-2015) North Ranch Resources (303) 204-7476
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Michael David Vanden Berg Michael David Vanden Berg Past President (2013-2014) Utah Geological Survey (801) 538-5419
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