Correlate Sequence Boundaries by Quantitative Stratigraphic Techniques
SCOTT, R. W., B. W. FOUKE, and S. A. NEDERBRAGT
The accurate dating and correlation of geological events represented by stratal surfaces such as sequence boundaries, transgressive contacts and maximum flooding intervals are crucial to the new level of precision required in the search for and production of hydrocarbons. However, traditional stratigraphic paradigms measure such events and episodes by interpolation techniques within broad biotic zones.
The graphic correlation technique was utilized to create a composite standard
data base from the Aptian through the Turonian using 30 geologic sections in the
Tethyan Realm. More than 800 bioevents of ammonites, inoceramids, planktic
foraminifers, selected benthic
forams, nannofossils, dinoflagellates, and
selected spores and pollen have been integrated with nearly 100 depositional and
geochemical datums. The stadial boundaries are defined by key taxa in reference
sections in France, Tunisia and Texas.
This data base was utilized to identify and correlate sequence stratigraphic contacts between several basins. Other sequence boundaries correlate with transgressive contacts in Upper Albian and Cenomanian reference section in Tunisia and Texas. The identification of contacts in cores and measured sections as sequence boundaries may be tested by graphic correlation.