Nur fatmawati
16611047
Temperatures in shallow marine sediments : influence of thermal properties , seasonal forcing, and man-made heat sources.
The thermal histories
of sedimentary basins and their effect on organic maturation. The focus of
large-scale thermal events, such as an initial rifting event, that affect
temperatures in a basin. Events of less global significance, however, are more important
to the internal temperatures of a sedimentary basin. Such effects as internal
thermal events (magma intrusion, diaparism), contrasts in heat production of U,
Th, and K in the sediments and underlying basement, large- and small-scale flow
of fluid, and thermal conductivity variations, both vertical and horizontal,
can raise or lower temperatures much more than lithospheric-scale events.
Temperature variations related to thermal conductivity variations are
illustrated using precision temperature-gradient logs from various sedimentary
basin settings. including laboratory measurements on cuttings and core samples,
in direct measurements, inference from well log measurements of travel time,
gamma-ray activity and so forth, conversion of seismic reflection travel time
to thermal resistance, and inversion of detailed temperature logs. Laboratory
measurements are in some cases unreliable, especially for shales, one of the
most abundant sedimentary lithologies.
No comments:
Post a Comment