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Abstract

AAPG Studies in Geology No. 48 / SEG Previous HitGeophysicalNext Hit References Series No. 11, Chapter 15: Numerical Identification of Microseeps in Surface Soil Gases of Western Venezuela, and Its Significance for Hydrocarbon Exploration, by Francisco Callejon and Hans H. von der Dick, Pages 381 - 392
from:
AAPG Studies in Geology No. 48 / SEG Previous HitGeophysicalTop References Series No. 11: Surface Exploration Case Histories: Applications of Geochemistry, Magnetics, and Remote Sensing, Edited by Dietmar Schumacher and Leonard A. LeSchack
Copyright © 2002 by The American Association of Petroleum Geologists and the Society of Exploration Geophysicists. All rights reserved.

Chapter 15
Numerical Identification of Microseeps in Surface Soil Gases of Western Venezuela, and Its Significance for Hydrocarbon Exploration1

Francisco Callej243_o.jpg (458 bytes)n
PDVSA Exploraci243_o.jpg (458 bytes)n y Producci243_o.jpg (458 bytes)n
Laboratorio Geol243_o.jpg (458 bytes)gico
Puerto La Cruz, Venezuela
Currently with Petroleum Systems and Geochemistry Institute, University of Houston, Houston, Texas, U.S.A.

Hans H. von der Dick
ChemTerra Exploration (CTE)
Roetgen, Germany

ABSTRACT

A soil-gas survey was conducted over a number of prospects in the plains ("llanos") and the Andean foothills regions in the Barinas-Apure Basin of western Venezuela. Initial attempts to numerically distinguish a seep-gas signal from background gases failed. Basic statistics allow only a tenuous differentiation between background gases and possible seep-gas populations having slightly anomalous hydrocarbon-gas concentrations. Further data processing on this specific population using advanced vector analysis facilitated the discrimination within a variety of soil-gas sources and distinguished suites of samples with weak, seepage-related surface-gas patterns that resemble normal condensate/wet-gas sources at depth.

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