This paper was prepared for the Deep Drilling and Production Symposium of the Society of Petroleum Engineers of AIME, to be held in Amarillo, Tex., Sept. 11–12, 1972. Permission to copy is restricted to an abstract of not more than 300 words. Illustrations may not be copied. The abstract should contain conspicuous acknowledgment of where and by whom the paper is presented. Publication elsewhere after publication in the JOURNAL OF PETROLEUM TECHNOLOGY or the SOCIETY OF publication in the JOURNAL OF PETROLEUM TECHNOLOGY or the SOCIETY OF PETROLEUM ENGINEERS JOURNAL is usually granted upon requested to the Editor PETROLEUM ENGINEERS JOURNAL is usually granted upon requested to the Editor of the appropriate journal, provided agreement to give proper credit is made.

Discussion of this paper is invited. Three copies of any discussion should be sent to the Society of Petroleum Engineers Office. Such discussions may be presented at the above meeting and, with the paper, may be considered for publication in one of the two SPE magazines.

Abstract

The complex lithology and the nature of the "measurement environment" make the "Deep -Anadarko Basin" one of the more difficult log evaluation problems facing the industry anywhere today. The paper describes methods for solving this problem.

The measurement environment is discussed in terms of perturbing effects on log readings. This includes a statement of what measurements are possible under various conditions of hole size, temperature, pressure, salinity, and gasified mud. The particular case of salt saturated drilling fluid, high temperatures and deep invasion is given special attention.

Application of the evaluation systems in use today to the Deep Anadarko Basin is discussed. This includes Quick-Look interpretation techniques employing the Dual Laterolog and/or the Compensated Neutron/Formation Density (Compensated) as well as the Advanced Computation System - CORIBAND.

The paper concludes that the evaluation systems available are capable of a highly consistent and reliable evaluation of this complex reservoir. However, as pointed out, cases exist where the measurements required for the evaluation system are sometimes deficient due to the harshness of the "measurement environment."

Introduction

Evaluation of the deep Anadarko Basin offers a difficult challenge: The Basin includes complex lithologies, high resistivities, variable shaliness, and both primary and secondary porosity. To find true porosity and determine lithology, both the porosity and determine lithology, both the Compensated Neutron and Formation Density logs are needed. If secondary porosity is to be identified, a Sonic log is also required. The use of these logs also offers avenues to gas identification, estimation of shaliness and advanced computer processing.

A variety of drilling fluids are in use, including fresh mud, salt muds, salt brines, and inverted emulsion muds.

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