A shooting time generation method for blended acquisition
GAN Zhiqiang1,2, SUN Xiang'e1, WEI Jian1
1. School of Electronic Information and Electrical Engineering, Yangtze University, Jingzhou, Hubei 434023, China; 2. Xi'an Geophysical Prospecting Equipment Company of BGP, CNPC, Xi'an, Shaanxi 710061, China
Abstract：The design of excitation source start-up time is one of the key technologies for efficient aliasing acquisition.The high-efficiency aliasing acquisition is a new acquisition mode produced by high-density seismic exploration, which can significantly shorten the seismic exploration period and reduce the acquisition cost, but the random degree of excitation source start-up time directly affects the quality of the acquired data.Therefore, this paper proposes an innovative algorithm for generating random excitation time in seismic exploration.Firstly, the local clock calibration and satellite time synchronization in a fixed time interval is carried out with using the satellite timing technology and the voltage-frequency linear relationship of a voltage-controlled crystal oscillator in a shorter period of time.Then the expected excitation time with a deviation of less than 10 μs is calculated based on the information of the source location, ready shot point excitation order, and time-distance rule parameters.Lastly, based on the predicted excitation time, the vibration sensor data collected in real time are used as the seed to randomly generate a random number of small jitter in a specified window as the source start-up time in millisecond to ensure the randomness of the production excitation time.The test solution shows that the dithered value of the random excitation time by the proposed algorithm has the characteristics of numerical size, controllable range, and strong randomness, which is closer to the actual needs of industrial applications.
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