Well log depth zoning
First Claim
1. A well logging method comprising:
- generating a number of well logs for a common subsurface depth interval;
selecting mutually depth-matched portions of the logs and processing them to find subsurface depth zones within each of which the logs have a respective selected mutual consistency; and
producing a tangible record of selected parameters of said zones.
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Accused Products
Abstract
Disclosed is a well logging process of finding depth zones within each of which a number of logs are mutually consistent within a respective selected tolerance. Logs which have good vertical resolution, for example the porosity logs, are used to zone a depth interval, and thereafter logs which have poorer vertical resolution, such as basic resistivity logs, are divided into the same zones. The zones can be used, as non-limiting examples, to rectangularize the logs and thus reduce probable noise components thereof; to crossplot by zone rather than by depth level, and thus again reduce probable noise in crossplots; to speed up procedures which utilize large vertical segments of logs by using therein zones of constant measurement level rather than measurements for each individual depth levels; and for studies of sedimentary depositions and inter well fitting and recalibration.
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Citations
25 Claims
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1. A well logging method comprising:
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generating a number of well logs for a common subsurface depth interval; selecting mutually depth-matched portions of the logs and processing them to find subsurface depth zones within each of which the logs have a respective selected mutual consistency; and producing a tangible record of selected parameters of said zones. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 22, 23)
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15. A well logging method comprising:
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generating a number of first well logs and one or more second well logs for a common subsurface depth interval, wherein the vertical resolution of the first logs is as good as or better than that of the second logs; combining the first logs with each other to find subsurface depth zones within each of which the first logs have a respective selected mutual consistency; converting said first and second logs to rectangularized logs which have a respective constant measurement level within each respective one of said depth zones and producing a tangible representation of selected parameters of the rectangularized first and second logs. - View Dependent Claims (16, 17, 18, 19, 20)
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21. A well logging method comprising:
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passing one or more well logging tools through a borehole traversing earth formations to generate a number of well logs for a common subsurface depth interval; selecting mutually depth-matched portions of the logs and processing them to find subsurface depth zones within each of which the logs have a respective selected mutual consistency; and utilizing the zones in further processing of logs for at least a portion of said common subsurface depth interval.
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24. A well logging system comprising:
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means for generating a number of well logs for a common subsurface depth interval; and means for combining mutually depth-matched portions of the logs with each other to find subsurface depth zones within each of which the logs have a respective selected mutual consistency and for producing a tangible representation of selected parameters of said zones. - View Dependent Claims (25)
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Specification