3D Seismic Acquisition Engineering Technology In Complex Area Case Study On Huhehu Area

With the development of petroleum exploration and development, the degree of oil and gas exploration and development continues to increase and the difficulty in increasing, the oil and gas exploration entered target exploration stage, the seismic demands more and more mainly embodied in two aspects:improve the resolution of seismic data and the increase of deep seismic data quality.The first part for excitation and receiving factors, observation system factors research, put forward the major method to improve the data resolution and imaging effects. The second part takes the Huhehu depression as an example, and studies the method of 3D seismic acquisition to improve the data resolution and the deep layer imaging effect of the complex area.The seismic geologic conditions in Huhehu area are complex and coal formation sandstone interaction deposition, lead to the difference of wave impedance between the strata, the seismic wave will be full or interlayer multiples in the stratum, making the mid deep seismic data signal-to-noise ratio is relatively low. With the establishment of geological model in the past data, volatility equation of the forward analysis, analyzes the main factors influencing the signal-to-noise ratio. Analysis of the current seismic data processing multiple wave pressing method found that most of the multiple attenuation methods were according to multiple wave attenuation method mainly relies on multiple wave speed and wave velocity difference, CMP gathers a wave and multiple wave time difference to suppress multiples, so the observation system design should ensure COSCO offset source-receiver to possess higher proportion.Through the study of Huhehu seismic geological condition, put forward by small dosage of single well excitation, on small area combined detector receiving way of improving data resolution, through a wide range, longer length arrange receiving, higher coverage number of observation system to suppress the multiples, enhances the deep imaging results. According to the data collected by this method after processing, improved resolution data, deep imaging effect is significantly improved.