TIME-TO-DEPTH CONVERSION OF SEISMIC HORIZON BY MULTILAYER ANALYTICAL MODELING METHOD

• Main Author: Sarifu, Ahmad
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/68660
• Institution: Institut Teknologi Bandung

The seismic horizon is a collection of time data that represents the boundary between the subsurface layers of the Earth. The seismic horizon can be used as data to explore and produce hydrocarbon natural resources. Such exploration and production require a depth map to determine the position and depth of the exploration drilled well, as well as estimate the amount of hydrocarbon natural resource reserves. That depth map can be obtained by converting seismic horizons into a collection of depth data. One of the methods that can be used to perform such conversions is the multilayered analytical modeling method. The purpose of this study was to perform time-to-depth conversions on the seismic horizon of X field using a multilayered linear analytical velocity model to obtain a depth map and calculate the average thickness of each layer. The conversion result is obtained by assuming the X field consists of two horizons and calculating the relative error of the conversion result to the marker depth of each well. In the A well, the conversion result depth (seismic depth) on horizon 1 was 4409.35 ft with an error of 2.36% and the seismic depth on horizon 2 was 6908.94 ft with an error of 8.39%. In the B well, the seismic depth on horizon 1 was 3987.97 ft with an error of 2.79% and the seismic depth on horizon 2 was 6718.47 ft with an error of 4.98%. The conversion results obtained that the minimum depth, maximum depth, and average thickness of the first layer were 4095.86 ft, 7090.71 ft, and 4838.46 ft, respectively. In the second layer, its minimum depth, maximum depth, and average thickness were 6262.31 ft, 8488.95 ft, and 2348.33 ft, respectively.