P rocurar que sea el medio más eficaz y eficiente para alcanzar los objetivos y metas que se pr etenden

There is no fault identified on the Paleozoic section of the processed seismic data with no evidence of either displacement of reflectors or associated diffractions. WSU-2015 line location area is flat and stable shelf. Paleozoic reflectors show no dipping. Between shot points 97 and 98 of seismic line 6 surveyed by Dr. Mayhew and his associates, there was a fault identified which is here being reviewed in this dissertation. The dip of the fault was not specified while the throw of the fault was mentioned as 100 feet approximately at the top of Pre-Mount Simon. The eastern side of the fault block was suggested as down thrown (Mayhew, 1969). No strong geologic data were provided to substantiate the presence of the fault other than the analog seismic reflection data. Within Conasauga lithology, there was a diffraction recorded on line 6 by Mayhew (1969) from the fault location. Except the Conasauga formation, at the other two lithology (Trenton and Precambrian Unconformity Surface), the fault was identified based on the regional gradient (Mayhew, 1969). So, the fault was justified primarily based on the diffraction seen within the Conasauga. Line 6 (Mayhew, 1969) is approximately quarter km north to WSU-2015 line while assuming Conasauga lithology doesn’t change distinctly at N-S strike direction. Shot points 97 and 98 between which the fault was detected by Mayhew (1969), were spaced by 1.4 km approximately and fall into the similar zone parallel to the WSU-2015 line (Figure 10, 11); thus, referring that those shot points (97, 98) should belong to different facies. Thereby, a diffraction seen on the recording data of line 6 (Mayhew, 1969) could be due to the response from two different facies.

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Conclusion

In this study, seismic line WSU-2015 was collected to explore the presence and nature of a fault previously interpreted by Mayhew (1969. His interpretation was based on single-fold analog seismic data in Madison County, Ohio. This new seismic line is parallel to and only 0.25 km south of Mayhew’s line 6. Even so, these data did not reveal such a fault. The previous interpretation was primarily based on an interpreted diffraction within the Conasauga Formation on the single-fold seismogram having a large station spacing. Analysis of the new seismic data suggests that facies vary laterally within the Conasauga Formation. This variation likely confused the interpretation of the earlier single-fold data.

The Paleozoic stratigraphy (formation tops) of the new seismic line was determined using a synthetic seismogram produced from the Madison #7 (API: 34097200070000) well. Using the synthetic seismogram, the well log data were tied to the new seismic data. The cross-correlation coefficient was increased from 0.060 to 0.550 by introducing a time shift of 0.27 ms. This result is satisfactory for identifying the Paleozoic reflections on the seismic section.

This new seismic line lies within the area of the Grenville Province east of the trace of the Grenville Front as defined by the regional potential field data and scattered bore holes. However, only weak, discontinuous and variably dipping reflections are seen at travel times greater than the base of the Mt. Simon (~0.5s TWT). Therefore, the seismic line reveals little about Grenville structures and these were not discussed.

The results of this study indicate that the other four faults (5 total) interpreted in the previous study (Mayhew, 1969) should also be reexamined.

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