Figure 7. Structure map, Prospect Posy, EI 330 Field, contoured on “J” sand, which, at approximately 1.7 seconds, has a good “Bright Spot” that conforms to structural closure. Interpretation by Mike Forrest. Primary crest of structure (in Block 330) and secondary crest (in Block 331) are part of a large closure extending through several blocks. Location of northeast-southwest seismic lines (Figures 8 and 9), as well as the locations of Shell 331 #3, Shell 331 #1, and Pennzoil 330 #1 wells and cross-section through them.