HIGH-PRECISION TIME SYNCHRONIZATION OF CONTROL PROCESSES IN OFFSHORE OIL EXPLORATION
M. S. Khairetdinov1, N. V. Yurkevich2
1Institute of Computational Mathematics and Mathematical Geophysics, pr. Akademika Lavrent’eva 6, Novosibirsk, 630090 Russia
marat@opg.sscc.ru
2Novosibirsk State Technical University, pr. Karla Marksa 20, Novosibirsk, 630092 Russia
nicolay 14283@mail.ru
Keywords: continuous seismic profiling method, GPS synchronization, CSP structure, test model, synchronization quality
Abstract
This paper considers the problem of improving the accuracy of time synchronization of sounding acoustic signals and recording of the pulses reflected from the seabed in offshore hydrocarbon exploration. The main method of exploration is continuous seismic profiling (CSP). The method is based on the analysis of the structure of an acoustic signal reflected from geological horizons. In this case, the possibility of resolving thin-layer structures is mainly determined by the accuracy of time synchronization. An instrumental method for increasing the required accuracy is proposed. A feature of this synchronization method is the use of dynamic autocorrection to add time corrections to the main devices of CPS systems, such as navigation, source control, and record control units, after each synchronization cycle with external GPS signals. This approach differs the proposed method from the traditional one. A test model created by this method showed that the guaranteed synchronization error is in the range ± 2 µs, while the technical requirements allow for errors not less than 1000 µs.
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