--> 3-D Seismic Attributes and Lithofacies Analysis: The Morrison NE Field and Morrison Field, Clark County, KS

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3-D Seismic Attributes and Lithofacies Analysis: The Morrison NE Field and Morrison Field, Clark County, KS

Abstract

Abstract

Seismic reservoir characterization and prospect evaluation based 3D seismic attributes analysis in Kansas has been successful in contributing to the tasks of building static and dynamic reservoir models and in identifying commercial hydrocarbon prospects. In some areas, reservoir heterogeneities introduce challenges, resulting in some wells with poor economics. Analysis of seismic attributes along with an investigation into the distribution of the producing formation's lithofacies gives further insight into hydrocarbon presence, fluid movement, stratigraphic correlation, porosity and other factors used in evaluating reservoir potential. This study evaluates a producing lease using seismic attributes analysis of an area covered by a 2010 3D seismic survey in the Morrison Northeast field and Morrison field of Clark County, KS. Development of this lease has been hindered by the unpredictable production rates encountered in each of the twelve wells completed within the survey area. The target horizon is the Viola limestone, which continues to produce from seven of the twelve wells completed within the survey area. In order to understand reservoir heterogeneities, hydrocarbon entrapment settings and the implications for future development plans, a seismic attributes extraction and analysis, guided with geophysical well-logs, was conducted with emphasis on instantaneous attributes and amplitude anomalies. Investigations into tuning effects were conducted in light of amplitude anomalies to gain insight into the seismic results that led to the completion of the twelve wells in the area drilled based on the seismic survey. Further analysis was conducted using several other approaches to solve this question was implemented and utilized, including well-log analysis, petrographic inspection of well cuttings, and the application of the Cathodoluminescence microscope and SEM in order to determine if the unsuccessful wells completed could have been avoided. Finally, this study attempts to present a pre-drilling 3D seismic attribute workflow that correlates to the lithofacies of the Viola limestone. Comparing the lithofacies to the seismic facies will establish reservoir parameters associated with successful well production in the Morrison Northeast field. This enhanced pre-drilling workflow will then assist in placing new wells in other locations within the two fields, as well as promote a consistent understanding of entrapment controls in this field.