Study Of 3D Seismic Data Acquisition In Transitional Zone Of Nanpu Oilfield

The shallow coastal transition zone of the Nanpu Sag is rich in oil and gas resources,with a large area and huge exploration potential.However,the complex surface conditions and surface structure of the area seriously affect the excitation and reception effects of seismic waves.The original seismic data is difficult to meet the needs of fine interpretation of geological structures.Therefore,it is of great significance to carry out research on high-precision 3D seismic exploration acquisition methods under complex surface conditions in shallow sea areas.In this paper,Nanpu No.1 is the research target,and the techniques of excitation,reception and observation system deployment in 3D seismic acquisition in the sea-land transition zone are studied.The paper analyzes the impact of complex natural environment on seismic acquisition in the beach area.In this paper,the previous collection methods,single shot and section quality and seismic geological conditions of the area were comprehensively studied to analyze the reasons affecting the quality of the beach sea data.Based on the seismic geological conditions of the study area,the targeted surface was carried out.Classification,further based on the classification of the surface,carried out research on the excitation and reception technologies of different land surface conditions in the transition zone,and formed effective excitation and reception methods in different regions of the transition zone.In the aspect of observing system design,the seismic geological model of the area is established based on the original seismic data.By selecting representative argument points,using forward modeling,illumination analysis and other techniques for parameter demonstration,comprehensive study of seismic exploration in the transition zone The water and land observation system and its docking method determine the corresponding observing system parameters.Drawing on the collection situation of similar work areas in recent years,reasonable technical countermeasures and measures are taken for technical difficulties,and combined with the results of parameter demonstration,a three-dimensional seismic exploration acquisition method capable of accomplishing geological tasks in this area with high efficiency and high quality is obtained.Under the reasonable design and strict field construction guarantee,the three-dimensional acquisition of Nanbao No.1 work area has achieved good exploration results,from single-shot data and initial superposition profile analysis,the signal-to-noise ratio and resolution of the shallow,medium and deep layers of new data.The rate is much improved compared with the old data,and the reflection information of the target layer is also rich.Through the collection of this area,it not only lays a good foundation for the subsequent indoor fine processing,but also provides further guiding significance for 3D seismic exploration in shallow sea areas.