Effective Integration of Core and Log Data

Paul F Worthington
BP Research, Sunbury-on-Thames, UK

Abstract:
The primary purpose of core-to-log data integration is to reduce the uncertainty associated with formation evaluation. In so doing, we take advantage of both the higher precision of core data and the larger scale of investigation of log data. It is particularly important that when tying logs back to core, the calibration algorithm is as well defined as possible.

This paper examines ways of optimising the calibration process. A basic requirement is the definition of a common reference depth scale. A second requirement is to reconcile the different vertical resolutions by the depth-averaging of core data, the signal-enhancement of log data, or both. Essential to this process is the adoption of "key intervals" as control zones for data integration. These procedures can result in a reduced uncertainty which transmits through to reservoir appraisal.

Important new developments will facilitate the integration of core and log data where core recovery is incomplete. These include the ultrasonic monitoring of core entry into the core barrel, the multi-sensor scanning of whole core, and the interactive display of both core and log data in interrogative work-station mode.

Implementation of the optimal data-integration strategy, and of the new upcoming developments, will require cross-discipline collaboration between those responsible for core acquisition, core analysis and wireline log interpretation. A key factor will be the ability to develop interpretative algorithms for cross-scale application.

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About the Society of Core Analysts

Objectives
The name of this organization is the Society of Core Analysts (SCA) and was founded in 1986. This organization is a Chapter-at-Large of The Society of Petrophysicists and Well Log Analysts (SPWLA) and is established with two objectives:

• To promote the aims, purposes, and membership of the SPWLA which is a non-profit scientific organization.
• To serve the interests of all persons who use or obtain reservoir evaluation information from rock and core samples.

As a guide for fulfilment of the first objective, this Chapter stands responsible to, and subject to, the rules and regulations of the SPWLA.

As a means toward the second objective this Chapter will sponsor technical speakers, projects, and presentation of papers dealing with formation evaluation. This Chapter will hold membership open to all core analysts, log analysts, geologists, geophysicists engineers, service company personnel and all others interested in the study of rocks and their interstitial fluids. This Chapter will also actively encourage membership and participation in the activities of the SPWLA.

Website: www.scaweb.org