--> Using Strike Resolved by Neural-Optic Processing to Determine Dip in Complex Structures Penetrated by Deviated Wells, by M. B. Enderlin and D. Lenzer; #90986 (1994).
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Abstract: Using Previous HitStrikeNext Hit Resolved by Neural-Optic Processing to Determine Previous HitDipNext Hit in Complex Structures Penetrated by Deviated Wells

Milton B. Enderlin, Dick Lenzer

True Previous HitdipNext Hit (magnitude and direction) is important for structure and reserves determination. In many exploration and development programs, the combination of complex structure and highly deviated borehole is often encountered. In such cases, the thickness of a particular interval measured along the borehole axis (measured thickness) can be many times larger than the thickness measured normal to the interval's bed boundaries (true stratigraphic thickness). The amount by which the measured thickness is larger than the true stratigraphic thickness can be expressed as a stretch ratio, which is equal to the quotient of measured thickness by the true stratigraphic thickness. In intervals where the stretch ratio is greater than five, the depth offsets of the dipmeter-pad responses become large nd the likeness of the pad responses becomes poor. Under such conditions the true Previous HitdipNext Hit cannot be accurately calculated from digital data using standard dipmeter programs requiring three or more correlatable pad responses to resolve a Previous HitdipNext Hit. However, in most cases, neural optic processing of the same data in a non-digital format can resolve the Previous HitstrikeNext Hit direction of the interval in the coordinates of the borehole ("in-hole" Previous HitstrikeNext Hit) by using only two correlatable pad responses. The key element in neural-optic processing is the identification of which pad response pair has virtually no depth offset. Such zero depth offset pad pair are by definition positioned along the "in-hole" Previous HitstrikeNext Hit. Using stretch ratio, "in-hole" Previous HitstrikeNext Hit, and basic structural stereographic principles, true Previous HitdipTop of an interval an be determined.

AAPG Search and Discovery Article #90986©1994 AAPG Annual Convention, Denver, Colorado, June 12-15, 1994