Three Dimensional Interpretation Of Borehole To Surface Electromagnetic Data

Author : M. Karrenbach
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (316 download)

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Download or read book An Integrated Multi-component Processing and Interpretation Framework for 3D Borehole Seismic Data written by M. Karrenbach and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This report covers the October 2003 until March 2004 time period. Work has continued successfully on several tasks 1 through 7. Most of these tasks have been executed independently. Due to availability of manpower during that time period we progressed steadily and completed some of the tasks, while others are still on going. We achieved the goals that we had set up in the task schedule. Reviewing the results of this work period indicates that our plan is on schedule and we did not encounter any unforeseen problems. The work plan will continue as projected. Several independent tasks pursuant the statement of project objectives have been executed simultaneously and are still on-going. This report summarizes the selection, test processing and test flow generation of a relevant 3D borehole seismic high-resolution test dataset. This multi-component data set is suitable for future use in this project due to data quality and unique acquisition characteristics. This report shows initial processing results that supported the data selection scheduled for Task 1. Use of real data is augmented by the creating a 3D layered synthetic geologic model in which multi-component 3D borehole seismic data were generated using 3D ray tracing. A gridded surface representation of the reflection interfaces as well as fully populated velocity grids were generated and archived. The model consists of a moderately dipping geologic setting with horizon undulations. A realistic velocity variation is used in between the three layers. Acquisition was simulated from a set of equidistant source locations at the surface of the model, while a close to vertical VSP well was used to capture the wave field data. The source pattern was close to a staggered grid pattern. Multi-component particle displacements were recorded every 50 ft down with an array length of 4,000 ft. P-P as well as P-S reflections were specified in the resulting wave field. We ensured a large enough aperture with enough fine sampling to perform advanced processing, imaging and analysis tests in the future during this project. Preparation of our software libraries for interfacing 3C display classes and mechanisms were carried out. We extensively tested the OIV and QT software library for usefulness in displaying 3C data and we thoroughly tested 3D scene graph communication between QT, OpenInventor and our existing software classes, which lead to optimizing the interface between them. We assembled an application skeleton which serves as a basis for future high level software tools. Based on this skeleton we implemented a 3C Work Bench tool as the primary prototyping tool for all future developments within this project. This work bench allows to load, manipulate and display data items. We demonstrated its basic functionality by loading source maps, horizons, seismic and velocity volumes, well logs into the tool, performing basic QC steps as is necessary in normal processing. All tasks were performed successfully, ensuring the continued progress of this project as outlined in the original proposal. Deliverables generated during this time period consist of reporting details and synthetically modeled seismic data for a 3D layered geological model. The numerically modeled SEGY data, as well as the model representation data, are ready to be sent out to DOE facilities for archiving. Based on the successful conclusion of work performed during this six month period we continue to generate synthetically modeled 3D borehole seismic data, according to Tasks 2 and 3. At the same time we proceed to design, implement and test according to the original plan the basic data classes and the basic framework outlined in Tasks 5 through 8.