METHOD OF ANALYZING A SUBTERRANEAN FORMATION AND METHOD OF PRODUCING A MINERAL HYDROCARBON FLUID FROM THE FORMATION
First Claim
1. A method of analyzing a subterranean formation traversed by a wellbore, using a tool comprising a transmitter antenna and a receiver antenna, the subterranean formation comprising one or more formation layers and the method comprising:
- suspending the tool inside the wellbore;
inducing one or more electromagnetic fields in the formation;
detecting one or more time-dependent transient response signals;
analyzing the one or more time-dependent transient response signals taking into account electromagnetic anisotropy of at least one of the formation layers.
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Abstract
Method of analyzing a subterranean formation traversed by a wellbore. The method uses a tool comprising a transmitter antenna and a receiver antenna, the subterranean formation comprising one or more formation layers. The tool is suspended inside the wellbore, and one or more electromagnetic fields are induced in the formation. One or more time-dependent transient response signals are detected and analyzed. Electromagnetic anisotropy of at least one of the formation layers is detectable. Geosteering cues may be derived from the time-dependent transient response signals, for continued drilling of the well bore until a hydrocarbon reservoir is reached. The hydrocarbon may then be produced.
82 Citations
22 Claims
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1. A method of analyzing a subterranean formation traversed by a wellbore, using a tool comprising a transmitter antenna and a receiver antenna, the subterranean formation comprising one or more formation layers and the method comprising:
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suspending the tool inside the wellbore; inducing one or more electromagnetic fields in the formation; detecting one or more time-dependent transient response signals; analyzing the one or more time-dependent transient response signals taking into account electromagnetic anisotropy of at least one of the formation layers. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of producing a mineral hydrocarbon fluid from an earth formation, the method comprising steps of:
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suspending a drill string in the earth formation, the drill string comprising at least a drill bit and measurement sub comprising a transmitter antenna and a receiver antenna; drilling a well bore in the earth formation; inducing an electromagnetic field in the earth formation employing the transmitter antenna; detecting one or more time-dependent transient electromagnetic response signals from the electromagnetic field, employing the receiver antenna; deriving a geosteering cue from the electromagnetic response; continue drilling the well bore in accordance with the geosteering cue until a reservoir containing the hydrocarbon fluid is reached; producing the hydrocarbon fluid. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A computer readable medium storing computer readable instructions that analyze one or more detected time-dependent transient electromagnetic response signals that have been detected by a tool suspended inside a wellbore traversing a subterranean formation after inducing one or more electromagnetic fields in the formation, wherein the computer readable instructions take into account electromagnetic anisotropy of at least one formation layer in the subterranean formation.
Specification