Determining the orientation of a seismic receiver, a seismic receiver, and a method or seismic surveying
First Claim
1. A method of determining the orientation of a seismic receiver, the method comprising:
- acquiring seismic or acoustic data at a receiver, the data including at least one of pressure and the particle displacement or a time-derivative of the particle displacement; and
determining the orientation of the receiver from at least one of the pressure measured at the receiver and the particle displacement or time-derivative of the particle displacement measured at the receiver;
wherein the step of determining the receiver orientation comprises;
determining the spatial derivatives in first and second horizontal directions of at least one of the pressure at the receiver, the particle displacement at the receiver or a time derivative of the particle displacement at the receiver, the first direction being different from the second direction.
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Accused Products
Abstract
The invention provides a method of determining the orientation of a seismic receiver (4, 6) from seismic data acquired at the receiver (4, 6). The determined orientation can be taken into account in subsequent analysis of the seismic data. This avoids inaccuracies that can occur if the receiver orientation is estimated. In a preferred embodiment the horizontal spatial derivatives of the pressure measured at the receiver are used in the determination of the orientation of the receiver. These may be calculated on either the source side or the receiver side. These are combined with horizontal components of the particle displacement, velocity or acceleration (or a higher time-derivative of the particle displacement). Alternatively, horizontal spatial derivatives of the particle displacement measured at the receiver may be used in place of the horizontal spatial derivatives of the pressure. The invention also provides a seismic receiver (6) having three or more closely-spaced, non-collinear pressure sensors (8, 9, 10). The provision of three or more pressure sensors enables the horizontal spatial derivatives of the pressure to be determined accurately.
52 Citations
28 Claims
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1. A method of determining the orientation of a seismic receiver, the method comprising:
- acquiring seismic or acoustic data at a receiver, the data including at least one of pressure and the particle displacement or a time-derivative of the particle displacement; and
determining the orientation of the receiver from at least one of the pressure measured at the receiver and the particle displacement or time-derivative of the particle displacement measured at the receiver;
wherein the step of determining the receiver orientation comprises;
determining the spatial derivatives in first and second horizontal directions of at least one of the pressure at the receiver, the particle displacement at the receiver or a time derivative of the particle displacement at the receiver, the first direction being different from the second direction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
- acquiring seismic or acoustic data at a receiver, the data including at least one of pressure and the particle displacement or a time-derivative of the particle displacement; and
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12. An apparatus for determining the orientation of a seismic receiver from seismic or acoustic data acquired at the receiver, the data including at least one of pressure and the particle displacement or a time-derivative of the particle displacement;
- the apparatus comprising means for determining the orientation of the receiver from at least one of the pressure measured at the receiver and the particle displacement or time-derivative of the particle displacement measured at the receiver, the apparatus comprising means for determining the spatial derivatives in first and second horizontal directions of at least one of the pressure at the receiver, the particle displacement at the receiver or a time derivative of the particle displacement at the receiver, the first direction being different from the second direction.
- View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
Specification