| 摘要 |
FIELD: geophysical studies of Earth's crust. SUBSTANCE: method can be used for deep probing during search and prospecting of oil and gas fields. Method is realized in the following way. Inhomogeneity parameters are exhibited by results of preliminary studies. Area Qof its projection on to day surface is calculated. Size of area on which observations are conducted are calculated by formula, where h is depth of lying of inhomogeneity. Maximal and minimal distances between field sources are calculated by formula, where α is measurement error. Geophones are positioned by system of profiles with spacing Dy between geophones. At least two field sources are arranged in parallel to inhomogeneity on different sides of it. Electric current identical in value and direction is passed. Derivative of vertical component of vector of magnetic induction and first horizontal components Uand U. of electromagnetic field are registered in points of observation. Taking into account parameters of holding medium one isolates electric components Uand Uof anomalous field. Then current similar in value is passed which direction remains original on one side of inhomogeneity and is changed for opposite one on the other side. Second horizontal components Uand Uof electromagnetic field are registered and magnetic components Uand Uare isolated. First and second horizontal components of electromagnetic field can be registered by installation of additional second system of field sources which number is not less than two. EFFECT: enhanced efficiency of geoelectric prospecting thanks to accounting for anomalous components of electric and magnetic fields. 1 cl, 8 dwg |
