Study On High-precision Seismic Acquisition Method For The Slope Belt Of Chezhen Depression

After the 1980 s,with the deepening of the reservoir exploration,the exploration and development in Jiyang depression of the eastern part of China has changed from the structure exploration to the micro structure exploration,complex lithology exploration and stratigraphic reservoir exploration as the target,there has become the main battlefield of the second development seismic exploration.The study area is located at the edge belt of the Che Town sag in the northwest of Jiyang depression,which is the main research block of the present oil field.In the 1990 s,due to the limitation of seismic instruments and equipment,the main target layer showed weak reflection or vacancy in the seismic profile,the seismic data was low S/N ratio and poor continuity.In order to improve the S/N ratio and resolution of exploration data,the topic utilize the demonstration of geometry parameters based on the geological model,attribute analysis and forward lighting analysis method to find best geometry which meet the Geological target and high price ratio,also to optimize the acquisition method from the selection of geophone model,the optimization of explosion conditions and quality guarantee measures and other aspects,and through analyses and effects of the acquired data to discusses how to improve S/N ratio and resolution.In recent years,due to the advantages of the Bin-divisible geometry method with low risk and high flexibility,the flexible bin geometry and method has been widely used in adjacent exploration areas,and the remarkable results have been achieved.Base on the demand of high-precision exploration,the research subject will still base on the Bin-divisible geometry method to further optimize geometry methods in the research area.In addition,the topic also optimize the geophone model,we select super geophone with the excellent performance and Land piezoelectric geophone with the large dynamic range and high fidelity to compare with each other,it would finally select geophone model which can meet exploration demand.Because of the complex surface conditions in the area,To ensure the attributes of the geometry,we conduct optimization design of shot points.In addition,We also use a combination of sources including dynamite,small vibrator and electric spark to effectively compensate data gaps caused by the large obstacles,and to ensure the integrity of data.The project has taken various measures to improve the effect of explosion and receiver,and also use a professional quality real-time monitoring system to escort high-quality data.Obtaining single shot data with wide frequency band and high S/N can laying a good foundation for the data processing and interpretation.