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This repository holds the data and code used in the reanalysis of the full waveform sonic log data obtained in the DFDP-2B borehole drilled in the Whataroa Valley, South Island, New Zealand to study the structure of the Alpine Fault.&nbsp; The borehole transits primarily through the hanging wall damage zone of the fault.&nbsp;&nbsp; The logging was accomplished by the logging team from Montpelier University, France.&nbsp; These data are supplemental to Dr. Oumeng Zhang&#39;s PhD thesis: THEORY MEETS TERRAIN: ADVANCING THE ALPINE FAULT INSIGHTS WITH SEISMIC ANISOTROPY INVERSION [PhD, Purdue University ]. West Lafayette, 2024. &nbsp;https://doi.org/10.25394/PGS.25569297.v1 &nbsp; The zipped archive contains the following files or folders: <ul> <li>README_Sonic_PURR.docx:&nbsp; This document provides a detailed explanation of all of the files and the programs developed to analyze the full waveform records as listed below. This includes a link to the original data repository at the International Continental Drilling Program.&nbsp; Briefly, the folder contains:</li> <li>A SLB VISTATM seismic data processing project Alpine_Fault_Sonic.vwn and associated files within the larger folder Vista Project.&nbsp; This contains the original and processed sonic log data, and the time picks were made using modules in this program.&nbsp; Note that the VISTA software package is commercial and readers will need access to it to work with the data in this format.&nbsp; However, the main raw and processed data are put in the readily accessible SEGY 1.0 format in *.sgy files mentioned next.&nbsp;</li> <li>The full waveform log data provided in SEGY v1.0 format of:</li> </ul> <ol> <li>FWScR49d.sgy: the raw 4-channel full waveform data.&nbsp;</li> <li>FWS_PredDecon_PStimes.sgy : the data corrected for polarity on Channel 3 and after application of predictive deconvolution to eliminate reverberations.</li> <li>Picked_PS_April_11_2024.asc : the manually picked P and S wave arrival times (in ms) from the analysis of FWS_PredDecon_PStimes.sgy from the SLB VISTA project. &nbsp; </li> </ol> <ul> <li>Matlab *.m programs include:</li> </ul> <ol> <li>quickLASread.m (function): This is a short script that allows one to ready a standard well log LAS file simply.</li> <li>Run_velocity_find.m: Program to convert the picked transit times from Picked_PS_April_11_2024.asc converting them to P and S wave velocities that are saved in the matlab data file Sorted.mat.</li> <li>Picks2Vel_Figure.m:&nbsp; using input Sorted.mat this program also calculates the P and S wave speeds and their statistics various ways then saves these to text files Pwave_vels.txt and Swave_vels.txt and then plots them.&nbsp; The program also reads in the LAS format file&nbsp; Tilt_Az_Run47.LAS that contains the borehole tilt and azimuth (as obtained from the systems on the acoustic borehole televiewer) and uses this to calculate for purposes of comparison the anisotropic P and S wave speeds for the intact rock without any fractures.&nbsp; This program finally produces and outputs the figure Velocity_Figure.png that reproduced in the thesis.</li> <li>sgyread.m can be used to read the raw *.sgy files into Matlab if so desired.&nbsp; Note that there are many other such matlab and python based codes readily available on the internet that can also do this job.</li> </ol> <ul> <li>Figures for the thesis and paper are archived also in the CorelDrawTM file Sonic_Log_Figures.cdr</li> </ul>

应用场景：

Alpine Fault Drilling DFDP-2B, South Island, New Zealand: Updated analysis of full waveform sonic log data