LOCATION DETERMINATION AND QUALITY CONTROL MICROSEISMIC HYPOCENTER CASE: SINGLE VERTICAL BOREHOLE ARRAY SENSOR

• Main Author: NIM: 12314019, ARDIANTO
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/25726
• Institution: Institut Teknologi Bandung

<p align="justify">Microseismic monitoring can provide an overview of the distribution and geometry of fracture formed during hydraulic fracturing. Most fundamental thing in microseicmic monitoring is the accuracy of the hypocenter location. Insufficient survey configuration coverage, in which case is single vertical borehole array can provide great uncertainty in hypocenter location determination. Several step of data processing is conduct for optimization of microseismic hypocenter location to overcome this problem. First, signal analysis is done by short time Fourier transform (STFT) to know the characteristic of microseismic, so it can be used for designing the most optimal filter. Then, we improve the arrival time picked using waveform cross correlation (WCC) technique. Hypocenter location determined using equal distance time (EDT) dan systematic search method. EDT gives preliminary hypocenter solution and origin time of microseismic event. The result is used in systematic search, with the model space is limited to the back azimuth direction of microseismic. Back azimuth is obtained through particle motion analysis or hodogram. Hodogram can give 1800 ambigous result, the apriori information of treatment well position to overcome this problem. Quality control that used in this study not only from RMS error but also take advantage of doblets and multiplets event obtained from waveform clustering algorithm. By doing this procedure the location of hypocenter solution can be well determined and give another way to quality control the solution.<p align="justify">