Figure 4. Interpretation of a high-frequency sequence in the Miocene Starfak Field, offshore Louisiana. (a) Amplitude stratal slice SS. (b) Instantaneous frequency stratal slice SS. (c) Higher-frequency, instantaneous frequency stratal slice in the selected box in (a). (Figure 10a from

Figure 5. (a) A well-site AVF from offshore Louisiana Starfak field, and (b) its instantaneous frequency equivalent. Wireline log (spontaneous potential) lithology ties to the 90°-phase seismic trace quite well. An FFT algorithm was applied to generate the AVF using a single well-site field data

Figure 10. Interpretation of a high-frequency sequence in the Miocene Starfak field, offshore Louisiana. (a) Amplitude stratal slice (SS labeled in Figure 9a ). (b) Instantaneous frequency stratal slice (SS in Figure 9b ). (c) Higher frequency, instantaneous frequency stratal slice

Figure 9. A well seismic section in the Miocene Starfak field, offshore Louisiana (see location in Figure 10 ). (a) The 90°-phase, poststack seismic data with faults and bed surfaces interpreted. (b) Instantaneous frequency section. A deflection of the SP log to the left indicates sandstone

Figure 5 Cross section across the study area of Starfak field, showing well-to-seismic correlation in two-way travel time. Numerous lenticular sandstones occur throughout the data volume (modified from Zeng 2001 ). Proportional slices used for this study are shown as numbered on the right hand

Figure 2. Well seismic cross section of upper Miocene sediments in Starfak field. Displayed well logs are C clay . Ranging from 1 (right) to 0 (left), C clay indicates log lithology (clean sandstone on left to pure shale on right). (a) Standard zero-phase seismic data

Figure 3. Cross section A-A' of Starfak Field showing well-to-seismic correlation in two-way traveltime. Stratal slices are numerically ordered according to increasing geologic time (no scale). Texaco-designated reservoir (lithostratigraphic) units are identified by letters in parentheses

Figure 8. Time structure map (contour interval = 25 ms) of the Robulus 4 sand with associated second-order fault swarms in Starfak Field.

Figure 19 Dip cross section of proximal third-order sequence 4 (upper Miocene), Starfak field. Biozone “box” records vertical variance for the top of the zone among the wells with fossil data. Paleobathymetric interpretations are based on benthic fossil assemblages: inner shelf = middle neritic

Figure 7. Relationship between BRs and IRs of Sequence 2 sandstone, Miocene Starfak Field, offshore Louisiana. It is assumed that sandstone in all locations has exactly the same AI profile as in the well in Figure 5 , except for sandstone thickness. BRs do better than IRs, with an apparent

Figure 20 Dip cross section of proximal third-order sequence 3 (upper Miocene), Starfak field. Biozone “boxes” record vertical variance for the top of each zone among the wells with fossil data. Paleobathymetric interpretations are based on benthic fossil assemblages: inner shelf = middle neritic

Figure 22 Dip cross section of proximal third-order sequence 1 (upper Miocene), Starfak field. Biozone “boxes” record vertical variance for the top of each zone among the wells with fossil data. Paleobathymetric interpretations are based on benthic fossil assemblages: inner shelf = middle neritic

Figure 21 Dip cross section of proximal third-order sequence 2 (upper Miocene), Starfak field. Biozone “boxes” record vertical variance for the top of each zone among the wells with fossil data. Paleobathymetric interpretations are based on benthic fossil assemblages: inner shelf = middle neritic

Figure 8. Relationship between BRs and IRs of Sequence 2 sandstone in 27 wells, Miocene Starfak Field, offshore Louisiana. BRs and IRs show linear trends in sandstone thickness similar to those in Figure 7 , although with significantly more scatter. BRs do consistently better than IRs

Figure 12 Dip cross section of medial third-order sequence 6 (middle Miocene), Starfak field. Biozone “box” records vertical variance for the top of the zone among the wells with fossil data. Paleobathymetric interpretations are based on benthic fossil assemblages: outer shelf = outer neritic

Figure 5. Field seismic section and wireline logs (GR/RES), well-site seismic trace, and AVF in Miocene Starfak Field, offshore Louisiana. The seismic trace is 90° phased, with troughs (red) indicating low-AI sandstones. Seismic data are relatively low in predominant frequency (30 Hz

Figure 1. Relationship between acoustic impedance (AI) and clay content ( C clay ) of Miocene low-AI sandstones and high-AI shales in two wells, Starfak field, offshore Louisiana. The C clay was calculated from baseline-shifted spontaneous potential/gamma-ray logs. The AI

Figure 13 Dip cross section of medial third-order sequence 5 (middle and upper Miocene), Starfak field. The lower two incised valleys in the third-order lowstand systems tract are parts of the most extensive valley systems in the study area. Biozone “boxes” record vertical variance for the top

Figure 6 Acoustic impedance histograms of upper and middle Miocene sandstones and shale in well 30-2, Starfak field. Sandstones and shale are classified on the basis of shale content ( V sh ) calculated from SP/GR logs, with V sh less than 0.2 counted as sandstones and V sh greater than

Figure 8 Dip cross section of distal third-order sequence 9 (lower and middle Miocene), Starfak field. Producing zones occur in fourth-order prograding-wedge and incised-valley-fill sandstones of the third-order lowstand systems tract. Biozone “boxes” record vertical variance for the top of each