Characterization of the San Miguel Sandstone by A Coordinated Logging and Coring Program
- C.F. Knutson (Continental Oil Co.) | F.R. Conley (Continental Oil Co.) | B.F. Bohor (Continental Oil Co.) | D.J. Timko (Continental Oil Co.)
- Document ID
- Society of Petroleum Engineers
- Journal of Petroleum Technology
- Publication Date
- May 1961
- Document Type
- Journal Paper
- 425 - 432
- 1961. Original copyright American Institute of Mining, Metallurgical, and Petroleum Engineers, Inc. Copyright has expired.
- 4.3.4 Scale, 1.2.3 Rock properties, 1.14 Casing and Cementing, 5.6.2 Core Analysis, 4.1.5 Processing Equipment, 4.1.2 Separation and Treating, 5.1.1 Exploration, Development, Structural Geology, 5.6.1 Open hole/cased hole log analysis, 2.4.3 Sand/Solids Control, 5.2 Reservoir Fluid Dynamics, 1.6 Drilling Operations, 2.2.2 Perforating, 1.6.9 Coring, Fishing, 5.5.2 Core Analysis
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Analyses of the cores and logs from 12 core test wells randomly spaced about a producing well showed that the average producing-zone rock properties are rather uniform within a single well's drainage area.
The dense zones have a limited horizontal continuity. They form barriers to vertical fluid migration which generally are not effective areally over distances greater than 50 ft.
The petroleum engineer is frequently faced with the problem of characterizing a reservoir to aid in development or production operations. In general, two approaches are used - (1) all the available data may be lumped and one specific "average" value obtained for each parameter, or (2) the datum points may be assigned coordinates and the system characterized by an array of values throughout a space frame. In following this second course, the variation in the parameters is a critical factor.
Everyone is aware of the very small fraction of the reservoir which can be sampled. In this characterization of the San Miguel-1 sand, Sacatosa field, Maverick County, Tex. (see Fig. 1) with data obtained from a coordinated coring and logging program, this small sample limitation has been handled by dividing the apparent formation variation into four components: (1) inherent measuring variations, (2) wellbore variations, (3) well drainage area variations, and ( 4) field-wide variations in rock properties.
Data on each of these components are presented in the following sections.
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