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Geological Data Interpretation: Computer Modeling and 3D Visualization, Slides of Geology

An overview of direct (forward) interpretation techniques using computer modelling and 3d visualization in data interpretation. Various methods such as 2d, 2.5d, and 3d computer modelling, and their applications to interpreting geological features like rift valleys, ore bodies, oil fields, salt domes, and volcanic structures. Specific examples are given for the owens valley in california, pine point lead-zinc ore body in canada, altus pool oil field in oklahoma, and long valley caldera in california. The document also discusses the challenges and problems in modelling and interpretation.

Typology: Slides

2012/2013

Uploaded on 07/19/2013

saen.chumi
saen.chumi 🇮🇳

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133
Data interpretation
2. Direct (forward) interpretation: Computer m odelling
2D
2.5D
2.75D methods available
134
Data interpretation
2. Direct (forward) interpretation: 3D computer
modelling
Define body by series
of contours and layer
thicknesses
Computer calculates
gravity anomaly of
each and adds
135
Data interpretation
2. Direct (forward) interpretation: Computer m odelling
Estimate basin
shape
Automatically
adjust thickness
to match gravity
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133 Data interpretation

  1. Direct (forward) interpretation: Computer modelling
    • 2D
    • 2.5D
    • 2.75D methods available 134 Data interpretation
  2. Direct (forward) interpretation: 3D computer modelling
  • Define body by series of contours and layer thicknesses
  • Computer calculates gravity anomaly of each and adds 135 Data interpretation
  1. Direct (forward) interpretation: Computer modelling
    • Estimate basin shape
    • Automatically adjust thickness to match gravity

136 END 137 LECTURE 5 138

Lecture 5: Examples

  • A rift valley: The Owens Valley, California
  • An ore body, Canada
  • An oil field, Oklahoma
  • A salt dome, Gulf of Mexico
  • An active volcano: Long Valley caldera, California - Tectonic background - The gravity field - Pre-processing and display of data - Problems in modelling & interpretation

142 Examples

  1. Altus Pool oil field, Oklahoma 143 Examples
  2. Salt dome in the Gulf of Mexico - gravity map 144 Examples
  3. Salt dome in the Gulf of Mexico - model

145

Long Valley Caldera, California

  • Regional context
    • M > 3 earthquakes in California: 1990 - 1999 146

Long Valley Caldera, California

Tectonic map

147

Long Valley Caldera, California

  • Volcanic

history

151

Long Valley Caldera, California

Current earthquake activity: M > 3 earthquakes:1978- 152

Long Valley Caldera, California

Earthquake seismometer network, 1997 153

Long Valley Caldera, California

Improving earthquake locations

154

Long Valley Caldera, California

Three-dimensional tomography images the present-day seismic structure 155

Long Valley Caldera, California

Gas emissions: COSPEC SO 2 monitoring at Pu’u O’o, Hawaii 156

Long Valley Caldera, California

Tree kill from CO 2

160

Long Valley Caldera, California

Complete

Bouguer

anomaly map,

including terrain

corrections

161

Long Valley Caldera, California

Low-pass

filtered Bouguer

anomaly map,

retaining

wavelengths >

50 km

162

Long Valley Caldera, California

High-pass

filtered Bouguer

anomaly map

163

Long Valley Caldera, California

2nd vertical

derivative of

Bouguer

anomaly map

164

Long Valley Caldera, California

Free-Air

anomaly map

165

Long Valley Caldera, California

Application of

directional filter

to Free-Air

anomaly