APLIKASI METODE LOW FREQUENCY PASSIVE SEISMIC (LFPS) UNTUK ANALISIS HIDROKARBON DI LAPANGAN

Abstract

The Low Frequency Passive Seismic (LFPS) method is a geophysical technique used to detect and analyze subsurface structures by utilizing low-frequency natural seismic waves. This study was conducted in the vicinity of area X to identify the presence of hydrocarbon reservoirs beneath the surface. The method involves analyzing potential fluid reservoirs by examining the maximum amplitude of the Power Spectral Density (PSD) and assessing parameters such as depth and the Vertical to Horizontal Spectral Ratio (VHSR). This approach helps to identify areas with exploration potential. The LFPS method uses natural seismic waves, in the form of microtremor measurements, as a data source. The fundamental principle of LFPS is to record and analyze ground vibrations, or microtremors, produced by various natural sources such as ocean waves and volcanic activity, using Fourier transform to process the data in V/H (Vertical/Horizontal) analysis. The results of this study indicate that by analyzing all obtained attribute parameters, such as the maximum spectrum PSD value patterns, particularly the depth parameter or PSD(Z), the V/H ratio curves, and the distribution maps of the maximum PSD(Z) values, along with reference well data and maximum V/H ratio values, there is potential for fluid reservoirs in two zones: Zone A and Zone B. Zone A exhibits higher Z and V/H amplitude values compared to Zone B. Zone A is located at points X-13, X-14, X-18, X-23, X-28, X-29, and X-33, while Zone B is at points X-39 and X-44.