Techlog Acoustics

Sonic data measurements are vital for well evaluation and interpretation tasks in domains such as geophysics, petrophysics, geomechanics, and drilling. Data quality control and validation are critical for these applications.

The Acoustics module for the Techlog platform provides all the functionalities required to load, analyze, and quality control data from all the major service companies, for both wireline and logging-while-drilling tools. With the Delta-T and Anisotropy workflows in the Techlog platform, processing of the sonic waveforms produces results you can rely on.

Process datasets in a single platform

Without appropriate software, processing raw sonic data is challenging due to its large size and the complexity of its structure (e.g., multidimensional arrays). The Techlog platform can load waveforms from all the major sonic tools in the industry, enabling you to process datasets in a single platform.

Prepare your sonic data for processing

The workflow starts with the preparation of acquired sonic data for all subsequent processing. This step ensures that all tool-specific pre-processing (e.g., gain normalization, DC-offset filtering, and start-time channels) is conducted and that the depth reference for each tool is honored before starting the quality control of the data.

The Techlog platform offers different ways to display and interact with acoustic data, such as waveforms and slowness time projection, along with other relevant data such as gamma rays, calipers, and wellbore images. Specialized tools for quality control investigation of sonic arrays such as waveform plots, spectrum plots, and dispersion analysis plots are available. The caliper data can also be viewed in borehole section plots to help analyze the borehole shape and the tool eccentricity inside it.

Fully benefit from your sonic data

The Slowness Time Coherence (STC) module comprehensively extracts formation slownesses from sonic waveforms. The processing can be conducted efficiently with default parameters adapted to each tool and environment when possible. For more challenging sonic data, advanced features are available for receiver disabling, transmitter mode, and interactive parameters in single depth for different formation types. For some Schlumberger tools, dispersive STC can be conducted for dipole data, Stoneley and Leaky-P.

The Delta-T wizard provides guided workflows, allowing users to build the full workflow and adapt their parameters interactively depending on their inputs and on the environment that has been logged (slow formation, fast formation, etc).

Perform anisotropy analysis from sonic data

Anisotropy analysis from cross-dipole array waveforms can be performed efficiently using the Four-Component Rotation module in Techlog 2013.1. This module is based on the generalized four-component rotation (Alford rotation) technique to determine