THE STUDY OF VIBROSEIS CHARACTERISTIC AND ITS ROLE IN COMPLETING THE 3D SEISMIC SURVEY DATA USING DYNAMITE SOURCE

• Main Author: ZAKI (NIM: 22315312), MUHAMMAD
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/29379
• Institution: Institut Teknologi Bandung

<p align="justify">Recently seismic survey for oil and gas exploration were also done in populated environments. Since dynamite will cause negative impact to the sorrounding, it could not be used as seismic source in that area. Hence vibroseis was used because its energy can be controlled and adjusted to the surface condition. This research studied the data merging which combined data from dynamite and vibroseis. By handling the characteristics different between them, a complete and good quality image wil be obtained. <br /> <br /> Vibroseis and dynamite were used simultaneously in the research area after doing parameter test which determined the signal reference of vibroseis. The parameter was based on signal penetration evaluation, reflector quality and s/n ratio to shotgather and stack result. The result recommended that 3 units vibroseis can work optimal for subsurface target research area in 70% force level, 6-96 Hz bandwith frequency, and 4 times sweep with 24 second length. Phase equalization was done by cross-correlation between shotgather and stack vibroseis with dynamite that will produces shifting phase value. The vibroseis data were rotated by 150 degree shifting phase value until its phase fitted with more abundant data from dynamite.The amplitude different was handled by using surface consistent method. By data merging, vibroseis could fill the empty slot data that previously only using dynamite as a source.<p align="justify"> <br />