Abstract

There has been a diameter increase in the use of JD seismic surveys in the last three years. Geophysicists are beginning to exploit the advantages of JD surveys, which include the higher resolution capability of JD migration. This leads to an improved picture of the position magnitude, and areal scent of seismic events, all the benefits of JD acquisition and processing are directly transferable to JD modeling techniques.

A JD seismic survey in the Shekilie area of northwest Alberta was subjected to detailed modeling. With interpreted time picks from an interactive workstation and all available well control, a time model consisting of 15 horizons was derived. Using well log information for interval variety and depth control, the time model techniques were use to produce an entire synthetic JD data volume.

Several iterations were performed until the picks from the real data gave the closest approximation to one the synthetic data. At this point a final depth model was established. With this depth model value metric calculation over an existing reservoir in place made. These were compared to results derived from reservoir engineering techniques.

Introduction

This paper presents the results of a computerized dimensional modeling study of a 2 sq, km oil producing area within the Shekilie basin. We will discuss the geology of this area, the goals, which we have tried to achieve by the modeling and our methods of accomplishment these goals.

The geophysical data used in this project is owned by Canterra Energy Ltd. Interpretation and modeling were performed at Western Geophysical Company of Canada, Ltd. Using the CRYSTAL workstation and the SIERA modeling system. Projector slides used for the presentation form an integral part our paper. These sliding were taken directly from the color monitor screen and could not be reproduced as page size illustrations.

SCOPE AND OBJECTIVES OF THE MODELING PROJECT

In the northwest corner of Alberta has an area of the site of the city of Calgary, called Shekilie. Geologically Shekilie is a sedimentary basin. The Shekilie basin has been very intensity studied by explorationists for the last 17 years. Over 7000 km of selsale Lines have been shot In Shekilie, and about 250 wells have been derailed.

The reason for which this small area has been given such importance. Ia because since 1970, when the Shekilie basin was discovered, more than 60 million bbl of oil have been found there, and the findings are still concluding. In fact the success rate in Shekilie is high about 40m.

Our study deals with a small past of the Shekilie basin, an area of approximately 20 sq. km. Seven wells have been drilled within this area are oil wells, 1 is an oil and gas well, and 2 ate dry.

We have attempted to create a geological model of this area and to model its response to the passing of seismic waves. These were our goals when we started the modeling project.

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