A Re-Analysis of The Cotton Valley Hydraulic Fracture Imaging Project: Imaged Geometry of the Taylor Sand Hydraulic Fractures.

., . (1997) A Re-Analysis of The Cotton Valley Hydraulic Fracture Imaging Project: Imaged Geometry of the Taylor Sand Hydraulic Fractures. Technical Report. Gas Research Institute.

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Abstract

The objective of this re-analysis was to examine the microseismic data from the Taylor sand hydraulic fracture injections 1 using a different methodology than that provided by ARCO.2 The ARCO approach typically uses two-well data so that only arrival time information are needed to locate microseismic origins. In the Taylor sand injections (perforated interval: 9620-9640), data were obtained in only one well (CGU-22-09). To locate the points, ARCO assumed a fracture azimuth and located microseisms near that azimuth line. This is a reasonable approach, given the good azimuth information from the two higher injections where two-well data were available, but there is a small possibility that some unusual behavior might have occurred which would not be observed if the azimuth were assumed. This re-analysis uses a single-well approach where p-wave particle motion is used to determine the azimuthal direction to the microseismic origin and p-wave and s-wave arrivals are used to determine the distance and the elevation of the microseism. The drawback of this method is that high quality p-waves must be obtained to get good azimuthal information. As a result, this approach cannot “see” as far as the ARCO approach, but should at least confirm the behavior on the near wing. It was originally intended that data be extracted to produce an equivalent 5-level system (e.g., analogous to that used in the GRI M-Site project) that would mimic the measured response if a 5- level wireline array were employed in a single well. As will be seen, the data quality (at least in the Taylor sand) are not sufficient to allow a suitable 5-level system to be extracted, and all usable levels were ultimately examined to provide an adequate analysis.

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Item Type: Reports (Technical Report)
Subjects: Methodology > Other-additional study
Region > USA > Texas > Cotton Valley
Inducing technology > Unconventional hydrocarbon extraction
Project: SERA > COTTON VALLEY: uconventional hydrocarbon extraction