The Investigation Of Exploration Technology About Gas-Hydrate Semi-three Dimension Seismic Datum

This article starting with the method of navigational fixing, developments a set of practical and feasible methods for gas-hydrate offshore seismic investigation. In order to meet the three dimensional hydrate image requirements, the navigational fixing is the most important technical difficulty for gas-hydrate semi-three dimensional seismic exploration. The following aspects are the main study works on fixing technology: semi-three dimensional fixer network disposition, navigation data processing, binning monitoring technology, fixing accuracy experiment and analysis and so on.After successfully study on navigational fixing method, the fixing accuracy completely achieves the request of natural gas-hydrate seismic survey. The main purpose of data acquisition is supplies rich seismic information for data processing and explanation. Thus we can selects the goal target area with high degree concentrate gas-hydrate and reservoir conditions, where we can conduct more in-depth investigations, unfolds"the three-dimensional shape characteristic of the gas-hydrate"well, understood"hydrate body's thickness, the bottom boundary and concentrates degree", and provide the advantageous technical support for finally optimizing well position. Therefore seismic acquisition methods need to be studied. By the method study and the synthesis experiment, starting with the harmonious combination parameter, the binning parameter optimizes, cable spread length aspect and so on, according to the massive field data and the related achievements in scientific research, this article summarized the natural gas-hydrate characteristic and the corresponding seismic survey technology, studies the corresponding acquisition software, and succeeds applies in the gas-hydrate exploration, and formed the reasonable parameter choice and application method for gas-hydrate semi-three dimensional seismic acquisition.The successfully study on gas-hydrates in the semi-3D navigation method and seismic data acquisition methods were generalized to a set of systematic field construction operations guidance, which put forward higher requirements for efficiency and quality of the semi-3D field acquisition ,and provide a strong basis for follow-up of gas-hydrate semi-three-dimensional seismic data acquisition.