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Well Log Analysis of Volcanic Rocks: Examples from the Nevada Test Site, Nye County, Nevada
As the exploration for hydrocarbon resources continues to move into non-traditional areas, and as the search for additional energy resources such as geothermal continues, subsurface geologists will encounter rocks not usually found in typical sedimentary-basin settings. One such group of rocks rarely encountered by most subsurface geologists is volcanic rocks. Volcanic rocks, however, are common at and near the surface in many parts of the world.
Volcanic rocks have a variety of litho-facies with significantly different fluid-flow properties. The accurate characterization of volcanic litho-facies is critical in evaluating the potential of volcanic deposits for energy resource exploitation. As with sedimentary rocks, well logs provide valuable data for analyzing the various volcanic litho-facies encountered in drill holes. However, unique aspects of the composition, deposition, and alteration of volcanic rocks require a certain amount of special knowledge about volcanic rocks and their responses to various well logs in order to accurately evaluate and characterize volcanic litho-facies.
At the Nevada Test Site (NTS) in southern Nye County, Nevada, more than 4,000 holes have been drilled as part of the underground nuclear weapons testing program and subsequent environmental restoration and groundwater modeling activities. Because the NTS lies within the southwestern Nevada volcanic field, many of the holes have encountered volcanic rocks, resulting in a large amount of well log data from volcanic rocks, and extensive experience in the subsurface characterization of volcanic litho-facies. Presented here are examples of well logs from a variety of volcanic litho-facies.
Successful Case Study:
What Makes Our Process More
Accurate
LogDigi technology completely adopts relative concepts and
rebuilds a strict lithologic conductive equation. LogDigi technology
is significantly improved well log analysis technology and different
from current well-logging interpretation methods that use absolute
concepts.
Traditional technologies are all based on an approximate value in
the designing of well-logging equipment, result measurements, data
collection and data processing. When facing extremely complex
lithology, it is necessary to design models in each area based on
changes in objective conditions. Traditional technology does not
adapt based on changes of objective conditions. Traditional
technology is often affected by different lithological, regional,
and well conditions. Traditional technology cannot accurately locate
oil and gas zones with complex lithology.
LogDigi technology has changed the current technology model of
evaluating quantitative oil/gas formations. This technology is a
breakthrough in well-logging technology, and an innovative method
for the discovery of new oil and gas zones. LogDigi technology can
automatically remove the influences of lithology variations in
different areas and different depths. It can also compensate complex
conditions, such as influences of deep intrusion of mud filtrate in
drilling with saline mud. LogDigi method also evaluates the
influences of oil layer flood out and automatically finds out
whether or not the parameters are accordant with actual situations.
This allows us to locate oil and gas zones 90% and greater. log
evalution for porosity, saturation, effective thickness of reservoir
beds. This plot is one of the successful samples. Contact us
for detail.
Our
successful case study 2
1) presentation
(ppt)
2) well log
analysis plot
Our
successful case study 3
1) report
2) result
3) well log analysis plot 1,
plot
2, plot
3
90%
old oil wells do not have Nuclear and Sonic logging. For many oil
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We determine the fluid and pressure distributions throughout the
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We analyze data to locate drilling sites where oil and gas may
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