− | The age of minibasin formation is determined by looking for relationships between sedimentation and deformation, like faulting or folding. [[:file:sedimentary-basin-analysis_fig4-44.png|Figure 2]] is a schematic diagram of the seismic reflection profile along the west side of the East Breaks 160-161 field ([[:file:Sedimentary-basin-analysis_fig4-42.png|Figure 1]]). That reflection profile is nearly coincident with the boundary between the Galveston and High Island exploration areas ([[:file:Sedimentary-basin-analysis fig4-17.png|Figure 3]]). The diagram depicts salt-cored anticlines and growth faults separating the progradational basin-filling cycles into distinct minibasins. The stratigraphic pattern shows composite depositional sequences, numbered 1 through 4, prograding into and across progressively younger growth-fault and salt-withdrawal basins. The stratigraphic boundaries outline seismic-stratigraphically defined depositional cycles calibrated by bioevents from several wells along the section.<ref name=ch04r10>Armentrout, J. M., and Clement, J., F., 1990, Biostratigraphic calibration of depositional cycles: a case study in High Island–Galveston–East Breaks areas, offshore Texas: Proceedings, Gulf Coast Section SEPM 11th Annual Research Conference, p. 21–51.</ref> Scales are approximate. | + | The age of minibasin formation is determined by looking for relationships between sedimentation and deformation, like faulting or folding. [[:file:sedimentary-basin-analysis_fig4-44.png|Figure 2]] is a schematic diagram of the seismic reflection profile along the west side of the East Breaks 160-161 field ([[:file:Sedimentary-basin-analysis_fig4-42.png|Figure 1]]). That reflection profile is nearly coincident with the boundary between the Galveston and High Island exploration areas ([[:file:Sedimentary-basin-analysis fig4-17.png|Figure 3]]). The diagram depicts salt-cored anticlines and [[growth fault]]s separating the progradational basin-filling cycles into distinct minibasins. The stratigraphic pattern shows composite depositional sequences, numbered 1 through 4, prograding into and across progressively younger growth-fault and salt-withdrawal basins. The stratigraphic boundaries outline seismic-stratigraphically defined depositional cycles calibrated by bioevents from several wells along the section.<ref name=ch04r10>Armentrout, J. M., and Clement, J., F., 1990, Biostratigraphic calibration of depositional cycles: a case study in High Island–Galveston–East Breaks areas, offshore Texas: Proceedings, Gulf Coast Section SEPM 11th Annual Research Conference, p. 21–51.</ref> Scales are approximate. |
| The age of formation of each minibasin can be interpreted from the relative age of expanded sedimentary section downthrown to each major growth fault or salt high. Along the [[cross section]], the expanded section occurs in progressively younger strata. In the northernmost diagrammed minibasin, the expanded section occurs in cycles 1 and 2. In the middle minibasin, the expanded section is in cycles 2 and 3. In the southernmost minibasin (the East Breaks 160-161), the expanded section formed during cycles 3 and 4. Anew minibasin has begun to form in cycle 4 sediments basinward of the steep salt-cored upper slope. | | The age of formation of each minibasin can be interpreted from the relative age of expanded sedimentary section downthrown to each major growth fault or salt high. Along the [[cross section]], the expanded section occurs in progressively younger strata. In the northernmost diagrammed minibasin, the expanded section occurs in cycles 1 and 2. In the middle minibasin, the expanded section is in cycles 2 and 3. In the southernmost minibasin (the East Breaks 160-161), the expanded section formed during cycles 3 and 4. Anew minibasin has begun to form in cycle 4 sediments basinward of the steep salt-cored upper slope. |