Basic elements of three dimensional geologic model and logical model of geologic structures

We have evaluated results from a study combining airborne z-axis tipper electromagnetic (ZTEM) and ground-based magnetotelluric (MT) data to image an epithermal system in British Columbia. The spatially coincident use of these two methods allowed for a direct comparison of both data sets in the overlapping frequency band and showed that both measurements were consistent. Inversion of just the ZTEM data suffered from the lack of electric field amplitude information, which could be provided by the MT data. Three-dimensional inversion modeling of the two individual data sets was performed. Models of electrical resistivity derived from both data sets were consistent and could be correlated with the geological and structural setting of the mineralization. Gold is associated with disseminated pyrite and marcasite in quartz-sericite-altered felsic volcanic rocks and intrusions, especially near the contact with mafic volcanic rocks and a late diorite intrusion. The quartz-sericite alteration yields a conductivity anomaly, relative to the more resistive mafic country rocks. Although ZTEM and MT do not possess the resolution of the geologic model derived from borehole data, our model agrees well with a regional assessment of the deposit.

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Three-dimensional geologic model of the northern Nevada rift and the Beowawe geothermal system, north-central Nevada

Geosphere ◽

10.1130/ges00100.1 ◽

2007 ◽

Vol 3 (6) ◽

pp. 667 ◽

Cited By ~ 8

Author(s):

Janet T. Watt ◽

Jonathan M.G. Glen ◽

David A. John ◽

David A. Ponce

Keyword(s):

Three Dimensional ◽

Geothermal System ◽

North Central ◽

Northern Nevada ◽

Geologic Model

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Construction and Visualization of a Three Dimensional Geologic Model Using GRASS GIS

Transactions in GIS ◽

10.1111/j.1467-9671.2004.00176.x ◽

2004 ◽

Vol 8 (2) ◽

pp. 211-223 ◽

Cited By ~ 20

Author(s):

Shinji Masumoto ◽

Venkatesh Raghavan ◽

Go Yonezawa ◽

Tatsuya Nemoto ◽

Kiyoji Shiono

Keyword(s):

Three Dimensional ◽

Grass Gis ◽

Geologic Model

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Three-Dimensional Geologic Model of Complex Fault Structures in the Upper Seco Creek Area, Medina and Uvalde Counties, South-Central Texas

Scientific Investigations Report ◽

10.3133/sir20085131 ◽

2008 ◽

Author(s):

Michael P. Pantea ◽

J.C. Cole ◽

Bruce D. Smith ◽

Jason R. Faith ◽

Charles D. Blome ◽

...

Keyword(s):

Three Dimensional ◽

South Central ◽

Complex Fault ◽

Central Texas ◽

Fault Structures ◽

Geologic Model

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Inversion for magnetic anomalies of arbitrary three‐dimensional bodies

Geophysics ◽

10.1190/1.1442779 ◽

1990 ◽

Vol 55 (10) ◽

pp. 1321-1326 ◽

Cited By ~ 30

Author(s):

X. Wang ◽

R. O. Hansen

Keyword(s):

Three Dimensional ◽

Large Data ◽

Magnetic Anomalies ◽

Large Data Sets ◽

Data Sets ◽

Inversion Algorithm ◽

Geologic Model ◽

Profile Inversion ◽

Inversion Techniques ◽

Medicine Lake

Two‐dimensional (profile) inversion techniques for magnetic anomalies are widely used in exploration geophysics: but, until now, the three‐dimensional (3-D) methods available have been restricted in their geologic applicability, dependent upon good initial values or limited by the capabilities of existing computers. We have developed a fully 3-D inversion algorithm intended for routine application to large data sets. The algorithm based on a Fourier transform expression for the magnetic field of homogeneous polyhedral bodies (Hansen and Wang, 1998), is a 3-D generalization of CompuDepth (O’Brien, 1972). Like CompuDepth, the new inversion algorithm employs thespatial equivalent of frequency‐domain autoregression to determine a series of coefficients from which the depths and locations of polyhedral vertices are calculated by solving complex polynomials. These vertices are used to build a 3-D geologic model. Application to the Medicine Lake Volcano aeromagnetic anomaly resulted in a geologically reasonable model of the source.

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IMPROVING THE EFFICIENCY OF FIELD DEVELOPMENT IN APPLYINGHIGH-RESOLUTION VOLUMETRIC SEISMIC AND GEOLOGICAL SUPPORT DRILLING IN THE STRUCTURAL UNCERTAINTY THREE-DIMENSIONAL GEOLOGICAL MODEL

Oil and Gas Studies ◽

10.31660/0445-0108-2015-4-11-19 ◽

2015 ◽

pp. 11-19

Author(s):

R. M. Bembel ◽

I. A. Schetinin

Keyword(s):

High Resolution ◽

Three Dimensional ◽

Maximum Efficiency ◽

Geological Model ◽

Structural Uncertainty ◽

Test Results ◽

Maximum Increase ◽

Field Development ◽

Use Of Technology ◽

Geologic Model

We consider a method of increasing the efficiency of field development through the use of high-resolution seismic building bulk maps at a scale of 1: 10,000 to isolate destruction subvertical zones that are potentially capable of producing a maximum increase in production when placing wells in these areas. Control test results showed high-resolution volumetric seismic confirmation of the results in 76% of cases. For maximum efficiency, the wiring holes at localized areas recommend the use of technology drilling geological support aimed at the most efficient collectors of penetration of the best quality. Control of the position of the barrel during drilling using the 3D geologic model allows tunneling in subvertical zones degradation.

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