ANALISIS PENGARUH GEOMETRI AKUISISI TERHADAP PENGOLAHAN DATA SEISMIK LAUT 2D LINTASAN “EFHA” BARAT LAUT SUMATERA; ANALYSIS OF ACQUISITION GEOMETRY IMPACT ON 2D MARINE SEISMIC DATA PROCESSING OF LINE “EFHA” AT NORTHWEST SUMATERA

MUTTAQY, FA’IZ, Sismanto

2016 | Skripsi | FMIPA

In seismic data processing, the survey geometry should be matched with the recorded seismic data. Each recorded data represents a single point of reflection, then several points of reflection that are in the same position tied into a gather. However, the acquisition parameters and survey geometry that have been designed before usually does not matched with the field acquisition (missed point) due to several factors. The missed points of reflection affect the validity and quality of seismic data processing. The acquisition of “EFHA” line has done by 1845 shots with line distance about 38,8 km. Seismic data processing is done by using two different geometries, they are ideal geometry which is made by ideal parameters on the survey design and real geometry which is made by using real coordinates in survey. In the preprocessing steps such as bandpass filtering, trace editing, true amplitude recovery, F-K filter, and deconvolution, were used by same parameter values. Velocity analysis is done separately using each picked point of velocity, then the stacking and migration processes were performed to see the differences of seismic section results. Both seismic section of the seismic processing results indicate that the appearance quality of reflector is affected by the number of fold. The greater fold number will show a better quality of seismic section than seismic section with lower fold number. The velocity model that used a real geometry shows a smoother undulation than a velocity model that used an ideal geometry.

Kata Kunci : acquisition geometry, seismic processing, fold