Application of Pre-Stack Time Migration (PSTM) Using Kirchoff Method on Marine Seismic Data 2D in Sulawesi Sea Waters

Abstract

To see the potential of weak zones, subduction zones and geological structures below sea level, research phases are needed based on geological and geophysical approaches. Geological approaches include regional geology and stratigraphy studies, while geophysical approaches include the depiction of underground structures using reflection seismic. The purpose of this study was to process 2D marine seismic data until the Pre-Stack Time Migration stage of the Kirchoff method and to interpret the underground surface structure of the Sulawesi Sea waters based on the Pre-Stack Time Migration using Kirchoff method in the Sulawesi Sea Water. This process can move the position of the reflector to the actual position, which is conducted by adding up the amplitude of a reflector point as long as a position is estimated at the actual location. The results of the interpretation of Pre-Stack Time Migration in the Line 22 crossing of the Sulawesi Sea waters have the presence of reflectors, Sulawesi ditch, faults and horizon layers of sedimentation. While the existence of low velocity zones can be analyzed by reading Root Mean Square (RMS) velocity in the cross section of this track, the lowest velocity zone distribution is found in CDP 7,350.8 with a depth of 11,860 ms to TWT depth of 10,967 ms having a constant velocity amounting to 2,291 m/s, and the estimated presence of weak rock structures.