Explorer Geophysical Corner

Geophysicists define gas reservoirs as Class 1, 2, 3 or 4, depending on their P-P amplitude-versus-angle (AVA) response.

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

Spring has been a busy time for DEG with the AAPG Annual Convention in Long Beach, Calif., and the Southwest Section meeting in Wichita Falls, Texas.

American Association of Petroleum Geologists (AAPG)
Explorer Emphasis Article

After years of successful exploration with 2-D seismic coverage, low-fold 3-D seismic programs are helping to cut costs in the search for overlooked gas traps in some areas in Montana.

American Association of Petroleum Geologists (AAPG)
Explorer Emphasis Article

Cattle actually have been known to chew up any unburied or exposed cable left on the ground. It’s a real and serious problem for the seismic acquisition sector.

American Association of Petroleum Geologists (AAPG)
Explorer Emphasis Article

Geophysical contractors sometimes find themselves in the darndest situations. Uganda was faced with the challenge to acquire a seismic survey across a large part of a water body for its Canada-based client Heritage Oil Corp.

American Association of Petroleum Geologists (AAPG)
Explorer Emphasis Article

Over the past few years there’s been copious buzz about new gee-whiz gizmos in the geophysical industry -- recording systems advances, new imaging techniques, etc.

American Association of Petroleum Geologists (AAPG)
Explorer Emphasis Article

Imagine your comfort level when drilling a well if you knew with absolute certainty there were hydrocarbons in the target reservoir. This is not a pipe dream.

American Association of Petroleum Geologists (AAPG)
Explorer Emphasis Article

If you want a quick read of the current state of the geophysical industry, take a look at the goings-on at Houston-headquartered OYO Geospace, which manufactures instruments and equipment for use in the seismic business.

American Association of Petroleum Geologists (AAPG)
Explorer Geophysical Corner

Theoretical models have been developed at the Bureau of Economic Geology that relate formation velocity and resistivity to hydrate concentration (Cgh) in deepwater, near-seafloor sediments.

American Association of Petroleum Geologists (AAPG)
Explorer Emphasis Article

The southwest Wyoming region has almost everything you could want in a Rocky Mountain hydrocarbon province.

American Association of Petroleum Geologists (AAPG)
DL Abstract

Three-dimensional (3D) seismic-reflection surveys provide one of the most important data types for understanding subsurface depositional systems. Quantitative analysis is commonly restricted to geophysical interpretation of elastic properties of rocks in the subsurface. Wide availability of 3D seismic-reflection data and integration provide opportunities for quantitative analysis of subsurface stratigraphic sequences. Here, we integrate traditional seismic-stratigraphic interpretation with quantitative geomorphologic analysis and numerical modeling to explore new insights into submarine-channel evolution.

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Request a visit from Jacob Covault!

American Association of Petroleum Geologists (AAPG)
DL Abstract

Around 170 million years ago, the Gulf of Mexico basin flooded catastrophically, and the pre-existing landscape, which had been a very rugged, arid, semi-desert world, was drowned beneath an inland sea of salt water. The drowned landscape was then buried under kilometers of salt, perfectly preserving the older topography. Now, with high-quality 3D seismic data, the salt appears as a transparent layer, and the details of the drowned world can be seen in exquisite detail, providing a unique snapshot of the world on the eve of the flooding event. We can map out hills and valleys, and a system of river gullies and a large, meandering river system. These rivers in turn fed into a deep central lake, whose surface was about 750m below global sea level. This new knowledge also reveals how the Louann Salt was deposited. In contrast to published models, the salt was deposited in a deep water, hypersaline sea. We can estimate the rate of deposition, and it was very fast; we believe that the entire thickness of several kilometers of salt was laid down in a few tens of thousands of years, making it possibly the fastest sustained deposition seen so far in the geological record.

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Request a visit from Frank Peel!

American Association of Petroleum Geologists (AAPG)
VG Abstract

In comparison with the known boundary conditions that promote salt deformation and flow in sedimentary basins, the processes involved with the mobilization of clay-rich detrital sediments are far less well established. This talk will use seismic examples in different tectonic settings to document the variety of shale geometries that can be formed under brittle and ductile deformations.

Request a visit from Juan I. Soto!

American Association of Petroleum Geologists (AAPG)

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