Rebecca Latimer
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| MSc | Geology/Geophysics |
|---|---|
| BSc university | Framingham State University |
| MSc university | Boston College |
Rebecca Latimer is currently retired. She has been in the oil industry for more than 35 years. Rebecca started her career with Amoco in New Orleans, LA in 1980. In 1986 she moved to Houston with Amoco and worked as an interpreter and sequence stratigrapher in a series of basin modeling groups. In 1989 she moved to Stavanger Norway where she worked as a sequence stratigrapher for Enterprise Oil. After leaving Amoco in 1995, she worked for five years as an inversion/geostatistics specialist and Chief Geoscientist with Jason Geosystems in Houston. In 2000 she joined Texaco's Upstream Technology Group working in inversion and geostatistics. After the Chevron merger, Rebecca held a number of positions including Team Leader for Deep Water Stratigraphy, Geostatistics and Business Development Manager for worldwide technology in the Strategic Planning Unit. Her last assignment with Chevron was on the Exploration and New Ventures Team where she spent time training and developing new hires as well as working international prospects and development. Rebecca received her Bachelor's degree at Framingham State University and Master's degree in Geology/Geophysics from Boston College in 1980, specializing in sedimentology and coastal processes.
She served on the Editorial Board of SEG's The Leading Edge as an editor for the Interpreter's Corner for six years. She has been co-chair of technical meetings at SEG and AAPG, judge for oral sessions, and has helped chair and organize an annual GCSSEPM Research Conference. She enjoyed serving as Managing Editor for books program because the work could be completed anywhere in the world, including aboard her 50 ft. trawler named "Wavelet."
Rebecca Latimer received the SEG Presidential Award for outstanding service to the Society of Exploration Geophysicists and was the Fall 2005 SEG Distinguished Lecturer.
Fall 2005 SEG Distinguished Lecturer
Uses, abuses, and examples of seismic-derived acoustic impedance data: What does the interpreter need to know?
Throughout the years there has been a concerted effort to integrate the geoscience disciplines to become more adept at understanding the potential of an area. In the 1980s, geophysicists interpreted 2D seismic data by overlaying log data on paper seismic sections and using generalized depth-to-time curves to determine which events represented markers on the logs. Geologists interpreted cross-sections by drawing straight lines between wells to represent their correlations. Because technology advances have changed the process, many people today have become "interpreters" of 2D or 3D data on workstations where the log data, seismic data, and many derivations of the seismic data (attributes, coherence, P impedance, inversions, elastic impedance, lambda rho, etc.) are available to fine-tune the analysis process. The question, however, still remains: Are we integrating the data yet?
Inversion of seismic data into acoustic impedance provides a natural tie to the log impedance data and forces the geoscientist, in analyzing seismic data, to extract appropriate wavelets, determine the phase and amplitude of the data, determine whether or not the phase is stable throughout the volume, and very intimately tie the well log impedance data to the seismic data. Utilizing inverted data at the beginning of the interpretation process requires that the geoscientist understand the rock properties in their target area before embarking on an "attribute" interpretation. Even when the P impedance data do not clearly distinguish between fluids or lithologies, value is added by using these data as the first interpretation tool. The simplicity in knowing that the change of values represents a change in rock properties without the complexity of wavelet variability is a distinct advantage to the interpreter. This initial process is critical to undertaking any interpretation of seismic data. Seismic data, being an interface property, contain tuning, side lobe effects, and phase and frequency variability, making it difficult to directly determine the geology. Inverted data, a layer property, are a more intuitive geologic tool that allows interpreters to utilize their natural ability to "see" the geology in the seismic data.
Today, advanced impedance tools use angle stack data and shear log components that can aid in distinguishing between lithologies and hydrocarbon properties. These data combine the benefits of angle data, AVO, and rock properties which—when analyzed together with the understanding of the depositional environments, stratigraphic concepts and the myriad of seismic attributes—can greatly increase the interpretative ability of the geoscientist.
This presentation will demonstrate the necessity for inversion and explain why it is beneficial in an interpretation workflow. It will examine both the strengths and drawbacks of using inverted data as compared with the seismic data and the original rock data. It will also show:
- how scale differences between various data types can effect the results,
- how the interpreter analyzes the rock properties and utilizes these with inverted data and
- how to spot pitfalls in the overuse of impedance data.
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