3D high-precision seismic acquisition techniques in Wuhaozhuang beach and shallow sea area

Wuhaozhuang area is the key and old oil area of Shengli Oilfield for oil-gas exploration in beach and shallow sea. It has great potential on increase in oil reserve and production, but the energy in middle-deep layer of the existing seismic data is weak, and its signal-to-noise ratio is low, so it is hard to meet the requirements for further detailed structure interpretation and reservoir description. Aimed at the characteristics and difficulties of the complex surface and underground conditions, based on complex structure modeling and prestack imaging result analysis, we designed and proved high-precision geometries for seismic acquisition suitable for the beach and shallow sea in Wuhaozhuang area, which ensured seamless data acquisition in the land-beach-shallow-sea area. By studying high-efficient dynamite source and using the shooting techniques based on near-surface lithology layering and modeling, the shooting effect of intertidal zone was improved. By studying and testing air gun array parameters, we optimized airgun array mode and shooting depth with good wavelet characteristics and strong energy. The platelike long-tail cone geophone coupler was adopted to improve the seismic wave receiving effect in intertidal zone as well. Besides, the repositioning technology and counter measurements were utilized to improve the positioning accuracy of underwater hydrophone. By jointly using all the techniques and methods, we achieved high-quality seismic data and obvious geological effect in Wuhaozhuang area.