The Estimation of Accuracy of the OBN’s Positions Calculation

The permissible minimum accuracy of OBN’s positions calculation is estimated by help of direct water wave’s first breaks (FB) from ordinary shots – based upon record parameters (sample rate – first of all) of reflection method.

The article contains the methods&soft of receiver positioning and list of record’s parameters, which are especially sensitive to receiver-coordinates errors by reflection method’s processing.

The position’s calculation criterion is formulated; relying on this the minimum necessary accuracy of OBN’s positions was estimated (Barents and Kara Seas shelf’s areas, typical records) – up to 8m.

The article contains the calculation’s method, man-hour and result’s accuracy.

The corrections necessity of “mirror” solutions by 2D seismic survey is considered expressly.

The basic conclusion: the seismic survey (reflection method) is all-sufficient instrument both for data acquisition and for bottom receiver’s positioning. Under this circumstance the purchase and use of hydro acoustic systems providing the seismic survey is not necessary.