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From Previous HitSeismicNext Hit Stratigraphy to Previous HitSeismicNext Hit Sedimentology: A Sensible Transition

H. Zeng
Bureau of Economic Geology, The University of Texas at Austin, Austin, TX

The concept of Previous HitseismicNext Hit stratigraphy was developed during the 1970’s on the basis of  2-D Previous HitseismicNext Hit technology. Utilizing reflection terminations, configurations and external forms interpreted from multiple Previous HitseismicNext Hit profiles, geologists could analyze Previous HitseismicNext Hit facies within depositional sequence boundaries and infer regional-scale depositional environments and depositional history.

The introduction of 3-D Previous HitseismicNext Hit technology brought dramatic changes to Previous HitseismicNext Hit interpretation. In addition to more accurate positioning and geometry control, 3-D Previous HitseismicNext Hit data provide crucial information for improving Previous HitseismicNext Hit facies analysis: high-resolution horizontal reflection patterns. Previous HitSeismicNext Hit sedimentology is the study of depositional lithology, facies, and processes based on the relationships between texture, shape, and trend of horizontal reflection patterns and the morphology of depositional systems.

A major obstacle facing Previous HitseismicNext Hit sedimentologists used to be their inability to pick reservoir-scale depositional surfaces that were mostly unresolvable in vertical Previous HitseismicNext Hit profiles. This problem has been largely resolved in the stratal slicing technique. Stratal slices from two 3-D Previous HitseismicNext Hit volumes in Louisiana illustrate that Previous HitseismicNext Hit sedimentology can significantly improve Previous HitseismicNext Hit facies analysis by (1) reducing ambiguity in Previous HitseismicNext Hit facies mapping and interpretation in Previous HitseismicTop stratigraphy, (2) increasing the vertical resolution from the third-order sequence or 100-m level to the reservoir or 10-m level (if the depth is less than 3,000 m), and (3) increasing the vertical sampling for studying high-resolution depositional history, even in wedged and growth-faulted depositional sequences.

AAPG Search and Discovery Article #90901©2001 GCAGS, Annual Meeting, Shreveport, Louisiana