Abstract: By 1930, the resistivity log was recorded commercially in several countries, and in 1931 the self‐potential (SP) measurement was added. An electromagnetic (EM) teleclinometer was introduced in 1932, a continuous temperature log in 1933, and an anisotropy dipmeter ca. 1935. The significance of the SP was an ongoing study until about 1962. The bases for the quantitative interpretation of resistivity for saturation were formulated by 1941. The years from about 1940 into the 1960s saw the development of other basic logs—dipmeter, gamma ray, neutron, induction, microresistivity, focused resistivity, density, and acoustic velocity—as well as other miscellaneous logs. Suites of resistivity logs were evolved to provide more accurate analysis. Much effort was expended on the interpretation of shaly sands. Neutron, density, and acoustic logs yielded information on porosity, lithology, gas saturation, and/or shaliness. Availability of porosity from these logs facilitated resistivity‐log interpretation. In the late 1950s, interest developed in the use of computers for log interpretation. By about 1961, dipmeter logs were being recorded on digital magnetic tape suitable for computer input, and other logs were available by about 1965. Digital recording has also facilitated transmission of logs via radio and telephone. Recently, digital systems for wellsite computations have been introduced.
Publication Year: 1980
Publication Date: 1980-11-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 24
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