Czy anizotropia elektryczna może być wywołana zmianami nasycenia wodą i gazem w mikro- i makroporach skał miocenu?

Abstract

Can electric anisotropy be caused by variations of water and gas saturation in micro- and macropores of Miocene rocks?A b s t r a c t. The paper presents the problem of evaluation of variation in the electrical anisotropy coefficientfor sandstone-shaly Miocene deposits depending on water and gas saturation of the pore space. A rock model built of alternating layers with varying micro- and macroporosity is discussed. This may correspond to a rock formation composed of parallel thin layers of sandstones or mudstones and claystones, which are dominatedby macro- and micropores, and are characterized by different grain size or grain sorting. The anisotropy coefficient is then affected by changes in electrical resistivity in individual layers that are a result of changes in saturation.