Test of National Uranium Resource Evaluation gamma‐ray spectral data in petroleum reconnaissance

Abstract

Advances in interpretation techniques have made possible effective use of aerial high-sensitivity gammaray spectral data to explore for petroleum in selected environments. These data were collected by the u.s. Department of Energy during the National Uranium Resource Evaluation (NURE) program throughout the conterminous U.s. and most of Alaska between 1974 and 1981. The tests reported here were limited to portions of the following I degree by 2 degree National Topographic Map Series (NTMS) quadrangles: the west half of the Palestine quadrangle, the east half of the San Angelo quadrangle, and the southeast quarter of the Big Spring quadrangle, all of which are in Texas.The radiometric uranium and potassium data were normalized for surface lithology (including soil differences), as well as for variations in counting geometry and hydrologic conditions, using a new technique based on thorium measurements and geochemical relationships between thorium and potassium and between tho-

Levantamentos Gamaespectrométricos em Granitos Diferenciados. II: O Exemplo do Granito Joaquim Murtinho, Complexo Granítico Cunhaporanga, Paraná

“…Pode-se normalizar K e U pelo Th, como proposto por Saunders et al (1987Saunders et al ( , 1993Saunders et al ( , 1994ver também Pires, 1995), através das fórmulas: …”

“…Segundo Saunders et al (1987), a dependência da concentração de potássio com relação ao tório é representada por uma função linear que passa pela origem (ver também Fornazzari Neto e Ferreira, 2003).…”

Gamaespectrometria Integrada a Dados Exploratórios Multifonte Em Ambiente Sig Aplicada À Prospecção De Ouro Na Folha Botuverá, Sc

“…Segundo Saunders et al (1987), o tório, que apresenta menor mobilidade geoquímica, pode ser usado como controle litológico para definir valores ideais de potássio e urânio de cada amostra, para posteriormente suprimir tais efeitos. Assim, propuseram uma Pires (1995) empregou pela primeira vez este método na prospecção mineral, identificando com sucesso zonas de alteração hidrotermal em Crixás-Guarinos no estado de Goiás, através do potássio anômalo (K d ).…”

Investigations on the Structure Tectonics, Geophysics, Geochemistry, and Hydrocarbon Potential of the Black Mesa Basin, Northeastern Arizona

“…Contractors charged with collecting these data also measured residual magnetism and the geologic unit. These data were collected between 1974 and 1981 over most of the lower 48 states, Alaska and parts of Canada in an effort to locate domestic uranium deposits, and has more recently found use in petroleum exploration in Texas (Saunders et al 1987). Helicopter-mounted gamma-ray spectrometers collected the radiometric data along east-west flight lines spaced nominally three mi apart with north-south tie lines flown at 12 mile intervals.…”

“…One of the more successful and publicized models was put forth by Saunders et al in 1987. One basic assumption is that whatever changes the concentration of one radioisotope similarly modifies the other two, if no hydrocarbon is present.…”