Multi-Azimuth
Offset Vertical
Seismic Profiles (VSPs) to Enhance Surface Seismic Images of
Reservoirs
Zhao, Xiaomin1, Yingping, Li1, James Jackson1, Shuangxi Wang2, Guiqing Yao2, Danli Zhang2, Wenxue Zhang2, Zhiren Yang2, Yugui Wang2, Xiangjie Dong2 (1) VSFusion, A Baker Hughes-CGG Company, Houston, TX (2) Daqing Geophysical Exploration Company, Daqing, China
Although three-dimension (3D) surface seismic can provide images
of subsurface structures with certain accuracy borehole seismic survey is
critical important to improve the images in a reservoir region with high
resolution
using three-component (3C) geophones placed in a well bore. In this
paper, we applied 3C VSP processing techniques to one zero offset and 6 offset
VSP (
Vertical
Seismic Profiling) data at different azimuths to enhance the
subsurface structure images from 3D surface seismic.
This VSP survey
was acquired from a vertical
well in an oilfield in northeastern
resolution
VSP imaging of the subsurface
structures. The zero offset VSP (ZVSP) was processing to obtain accurate
velocity measurements and then built a high
resolution
velocity model for
VSP-CDP transform and migration imaging. Offset VSP (OVSP) data were 3C rotated
and separated to enhance different modes of reflected waves. The reflected wave
fields were CDP transformed and migrated to generate high
resolution
images of
subsurface structures. Images from ZVSP and OVSP, logging data, and a 3D
surface seismic volume were visually integrated by a 3D visualization system
specially designed for VSP solutions. This study demonstrates the power of 3C
processing of multifarious VSPs to enhance images of subsurface images in a
reservoir region.