--> Abstract: A Different Seismic Interpretation Approach to Define Stratigraphic Sequences and Predict Facies Distributions in Continental Strata: an Example from the Middle Magdalena Basin, Colombia, by I. D. Olaya; #90933 (1998).
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Abstract: A Different Previous HitSeismicNext Hit Interpretation Approach to Define Stratigraphic Sequences and Predict Facies Distributions in Continental Strata: an Example from the Middle Magdalena Basin, Colombia

Olaya, Ivan D. - Ecopetrol

Conventional methods of Previous HitseismicNext Hit stratigraphic analysis, which depend on angular discordance and terminations of Previous HitseismicNext Hit reflections, are not very dependable or accurate in continental strata due to the dominance of nearly horizontal and parallel and/or discontinuous and incoherent Previous HitseismicNext Hit rejections.

We have developed a philosophically different, robust approach to analysis of Previous HitseismicNext Hit reflections from continental strata. This approach relies on prediction of Previous HitseismicNext Hit reflection and wave-form attributes from stratigraphic analysis of well-log data; comparison of the predicted with the observed reflection attributes; adjustment, if necessary; and prediction of well-log attributes from observed Previous HitseismicNext Hit reflection attributes at other locations.

This method acquires robustness for the following reasons. (1) Our stratigraphic analysis of well logs identifies chronostratigraphic units which are correlated across facies tracts. Since Previous HitseismicNext Hit reflections are generated from chronostratigraphic units, observations from the two data sets are comparable. (2) Stratigraphic cycles and their facies components (which are laterally variable within cycles) are identified at high Previous HitverticalNext Hit resolution in well logs. This high-resolution information is transferred to the Previous HitseismicNext Hit domain in the form of a prediction, using the relation that the magnitude of the impedance contrast multiplied by the continuity of the stratigraphic unit under consideration generates reflections. Well-log predictions of continuity, amplitude and wave-form character of the Previous HitseismicNext Hit response are compared with the observed, and the observed Previous HitseismicNext Hit character acquires geologic meaning. (3) Since the two data types generate the same types of stratigraphic information, but at different Previous HitverticalTop and lateral resolution, the approach of hypothesis formulation and hypothesis testing using alternating data types is a powerful means to evaluate the accuracy of stratigraphic predictions.

AAPG Search and Discovery Article #90933©1998 ABGP/AAPG International Conference and Exhibition, Rio de Janeiro, Brazil