The Borehole Acoustic Reflection Survey developed by Schlumberger employs monopole acoustic sources that radiate acoustic energy evenly in the circumferential direction.
Gaeta Bay, located on the Campania margin, was investigated through the interpretation of seismic reflection and borehole data together with a stratigraphic correlation of dated outcropping units.
When acoustic energy is radiated to the formations around a borehole during azimuthal acoustic reflection logging, the vertical deflection angle of the main acoustic beam radiated by the transmitter is generally smaller than the first critical angle of the incident acoustic wave on the borehole wall from the borehole fluid.
It was also observed that the micro-fractures do not have a considerable effect on Stoneley wave reflection, while the borehole washouts and shale layers have a great impact on this.
Based on the regional cross sections constrained by deep seismic-reflection data and borehole logs (Heck, 1998; Tennyson and Kropp, 1998; Forman and Redin, 2005; Redin, 2005) and high-resolution seismic-reflection data coupled with proprietary oil industry dartcore data (Ashley, 1977), these outer-shelf outcrops consist of the Miocene Sisquoc Formation and the Pliocene Repetto and Pico Formations.
The interpretation of seismic reflection profiles off Vesuvius, borehole stratigraphies, onshore and geomorphological data allowed to recognise the relationships among debris avalanches, criptodomes and faulting.
Structural and stratigraphic data from the basin substratum and filling sediments, integrated with the interpretation of reflection seismic profiles and borehole logs, highlight that the Siena Basin consists of a tectonic depression with a complex internal architecture.
Although an obvious bottom-simulating reflection (BSR) was detected below borehole number SH5, no gas hydrates were found at this borehole.
Geological deformation in the northern New Madrid seismic zone, near Olmsted, Illinois (USA), is analyzed using integrated compressional-wave (P) and horizontally polarized-wave (SH) seismic reflection and regional and dedicated borehole information.
"From boreholes," says one learner.
