Borehole image techniques applied to identification of chert and dolomite layers in lacustrine sediments

Identifier:  imarina:9217447

Handle: https://hdl.handle.net/20.500.11797/imarina9217447

Authors:  J Miró; María José Jurado; Oriol Oms Llobet; Juan Diego Martín Martín; Jordi Ibáñez; Pere Anadón Monzón; J Crespo; B Gómez de Soler; G Campeny; Jordi Agustí i Ballester

Abstract:
Geophysical logging tools, particularlyultrasonic acoustic borehole image techniques, are applied on two different wells (CP1 and CP2) to identify and characterize the lacustrine interval (40m) of the Camp dels Ninots maar -diatreme infill (Pliocene, Catalan Coastal Ranges). The CP1 well was cored and also geophysical logs and oriented borehole images were acquired. CP2 hole was partially cored but logging (geophysics and borehole images) was fully undertaken. Continuous core recovery in CP1 is compared with oriented images and is further used to identify and characterize highly reflective signals in a section of CP2 borehole that was not cored. These signals are related to silicified zones and belong to discontinuous centimetric chert nodules, while indurated massive carbonates are characterized as intervals of continuous reflectance. Despite opal nodules (chert) can be relatively small, they have a distinctive response in the ultrasonic borehole images.