ELECTRICAL RESISTIVITY OF MODERN MARINE SEDIMENTS FROM THE BERING SEA.

摘要

A study of the relationships between electrical resistivity and the bulk physical properties of sea-floor sediments. Electrical resistivity was measured in gravity-cored,unconsolidated sediments from the Bering Sea. Resistivity ranged from 29.1to 71.0ohm-cm at 25C and irregularly increased 11ohm-cm in the first meter below the sediment surface,principally because of porosity changes. In situ resistivity may be greater than these laboratory values by a factor of 2. The formation factor, F,which is the ratio of sediment resistivity to interstitial water resistivity,ranged from 1.57to 3.70and was related to porosity,phi,and wet bulk density,rho,respectively,by: F = 1.30phi to the minus 1.45power and F = 1.12rho to the 1.72power of plus or minus 15percent and plus or minus 10percent. Within certain limits resistivity may be used to estimate other physical properties of sediment. (Author)