Method for interpreting well log records to yield indications of gas/oil in an earth formation such as a sandstone, limestone, or dolostone
The present invention indicates that acoustic characteristics associated with a first well penetrating a gas/oilcontaining strata such as a sandstone, limestone or dolostone, can be normalized (and favorably compared) with similar characteristics of a second, contiguous well of known hydrocarbon potential, such characteristics being calculated and displayed by means of a machineimplemented data processing method in which well logging and geologic data are fed thereto to calculate such characteristics without the need for shear-wave velocities. In more detail, in accordance with the invention brinesaturated bulk and shear moduli, (i.e., Kw and Gw) of a sandstone, limestone or dolostone penetrated by the second well can be predicted as a function of, say, brinesaturated P-wave modulus (Pw) alone (independent of shear-wave velocity). In that way, resulting acoustic values including distinct velocity and amplitude values as a function of a saturation operator can ultimately be provided. Such values, when compared to actual, inwell, field-generated characteristics of the first well, are surprisingly accurate predictors of the amount of gas/oil saturation in and around the first well. The method has particular accuracy in designating gas zones within formations of interest due to use of the complete Benedict-Webb-Rubin non-ideal gas law in psuedo-reduced form.
- Assignee:
- Chevron Research Co.
- Patent Number(s):
- US 4393486
- OSTI ID:
- 5675692
- Resource Relation:
- Patent File Date: Filed date 27 Oct 1980; Other Information: PAT-APPL-200702
- Country of Publication:
- United States
- Language:
- English
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Method for interpreting seismic records to yield indications of gas/oil in an earth formation such as a sandstone, limestone, or dolostone
Method for interpreting seismic records to yield indications of gas/oil in an earth formation