Probabilistic evaluation model of an electromagnetic target with a given gravity anomaly

Autor:	M. St-Amant, E. Gaucher
Rok vydání:	1980
Předmět:	chemistry.chemical_classification Gravity (chemistry) Sulfide Probabilistic logic Mineralogy Magnetic dip Gravity anomaly Geophysics chemistry Geochemistry and Petrology Histogram Noise (radio) Geology Free-air gravity anomaly
Zdroj:	GEOPHYSICS. 45:1184-1196
ISSN:	1942-2156 0016-8033
DOI:	10.1190/1.1441116
Popis:	An exploration strategy for base metals (sulfides) frequently involves electromagnetic (EM) surveys followed by detailed gravity surveys over the areas of EM anomalies to define clearly drilling targets. Since drilling costs are high, an objective and accurate quantitative target evaluation is necessary. The expected sulfide content of a target is the only evaluation parameter available from geophysics which may have some correlation with the target economic value. The depth, dip angle, and strike‐length of a dipping lenticular electrically conductive body can be evaluated from EM data. Then, the expected sulfide content is evaluated from the gravity data by excess mass calculation. However, there is always some geologic noise in the gravity data which tends to cause an overestimation of the sulfide content. We find that statistical properties of the gravity noise and sulfide content statistical histograms of EM anomalies must be taken into account to make an accurate evaluation of the expected sulfide content of EM anomalies.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::a024f37d0b681b9a8d69db49c4b4d08a https://doi.org/10.1190/1.1441116 Zobrazit plný text záznamu