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US 12,692,778 B2Granted
Anticorrelation in propagation resistivity logs for geosteering
AssigneeSchlumberger Technology Corporation
InventorsXiaoyan Zhong, Yong Chang, Sepand Ossia, Shunfeng Zheng
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Abstract
Aspects of the disclosure provide for using anticorrelation in propagation resistivity logs to detect boundary approaching conditions. Geosteering may be performed based on the detected boundary approaching conditions. The boundary detection and geosteering may be for a high angle well. The anticorrelation may be between attenuation resistivity and phase shift resistivity.
Claims20
A method for geosteering, the method comprising:
- collecting logging while drilling (LWD) measurements during drilling of a well, wherein the LWD measurements include propagation resistivity response data;
- determining one or more attenuation resistivity values and one or more phase shift resistivity values from the propagation resistivity response data;
- identifying an anticorrelation between the one or more attenuation resistivity values and the one or more phase shift resistivity values;
- and
- making a geosteering decision for the drilling of the well in response to the identified anticorrelation.
2 more elements
A system comprising:
- one or more logging while drilling (LWD) tools configured to collect LWD measurements during drilling of a well, wherein the LWD measurements include propagation resistivity response data;
- and
- one or more processors configured to:
- determine one or more attenuation resistivity values and one or more phase shift resistivity values from the propagation resistivity response data;
- identify an anticorrelation between the one or more attenuation resistivity values and the one or more phase shift resistivity values;
- and
- make a geosteering decision for the drilling of the well in response to the identified anticorrelation.
4 more elements
A non-transitory computer readable medium storing computer executable code for geosteering, the computer executable code comprising:
- code for collecting logging while drilling (LWD) measurements during drilling of a well, wherein the LWD measurements include propagation resistivity response data;
- code for determining one or more attenuation resistivity values and one or more phase shift resistivity values from the propagation resistivity response data;
- code for identifying an anticorrelation between the one or more attenuation resistivity values and the one or more phase shift resistivity values;
- and
- code for making a geosteering decision for the drilling of the well in response to the identified anticorrelation.
2 more elements
Dependencies are inferred from the claim text.