Publication Rights Reserved Publication Rights Reserved This paper is included in the Proceedings of the 1976Appalachian Petroleum Geology Symposium on Devonian Shales. It is reprinted here with Petroleum Geology Symposium on Devonian Shales. It is reprinted here with permission of the Geological and Economic Survey of the State of West permission of the Geological and Economic Survey of the State of West Virginia. Publication elsewhere is hereby restricted to an abstract of not more than 300 words, without illustrations, unless the paper is specifically released for publication by the copyright holder. Such abstract should contain appropriate conspicuous acknowledgment.
Conventional well logs and interpretation methods do not provide sufficient information to evaluate the productive gas zones of the Devonian productive gas zones of the Devonian shale in the Appalachian area. The major gas accumulations are believed to occur in fracture systems in close proximity to the source beds. With proximity to the source beds. With this premise in mind, an approach to locating and evaluating the fractures and showing evidence of the source beds has been formulated.
The approaches to evaluating the fractures in the shale are discussed as follows:
Empty Borehole Logging Program and Computer Data Presentation
Seisviewer Survey
Applications of the 3-DVelocity Log
The empty borehole logging program to evaluate the shale formation program to evaluate the shale formation is extremely important since most operators are concerned about washouts and caving caused by filling the borehole with fluid. The Devonian shale is particularly sensitive to voter. The following should be considered an essential empty borehole logging program with currently available logs:
Gamma-Ray Log Formation Density Log Induction Log Temperature Log Sibilation Survey
Since conventional interpretation techniques using the above combination of logs do not provide a conclusive result in identifying potential pay zones in shale, a new potential pay zones in shale, a new concept and technique directed toward evaluating potential productive zones has been employed.
