Wide azimuth,wide band and high density(referred to as"two widths and one heights")seismic acquisition technology has obvious technical advantages in solving exploration problems such as low signal-to-noise ratio area exploration and complex geologic body imaging.However,with the deepening of complex stratigraphic lithology exploration,unconventional oil and gas exploration and other hidden oil and gas reservoirs,the requirement of seismic data fidelity has been raised to an unprecedented level.To improve the fidelity,broadband ultra-high sensitivity sensors should be used in field seismic acquisition to improve the ability of weak signal recording.The second is to eliminate the effect of combination excitation and reception.The third is to solve the problem of formation absorption attenuation from near surface to target layer.For this reason,the concept of wide azimuth,wide band,high density and high fidelity(referred to as"two widths and two heights")seismic acquisition is put forward.After years of practice and development,a single point 3D seismic exploration technology of"two widths and two heights"is formed.The core of high fidelity is the use of high sensitivity detector in the field,improve the dynamic range of data recording,single point reception to eliminate the combination effect,improve the weak signal recording ability,and eliminate the combination caused by the geophone time difference,reduce the near surface fluctuation and speed difference caused by static correction,speed picking and other problems affecting the fidelity.After the"two widths and two heights"seismic exploration technology was put forward,it was first tested in Changqing oilfield,Liaohe oilfield,Sichuan oilfield and other exploration areas,and good application results were achieved.With the comprehensive promotion and application of nodal seismic acquisition system,"two heights"seismic processing,true surface seismic imaging and other technologies,the"two widths and two heights"seismic exploration technology has been fully promoted in PetroChina,and has become the main technology of onshore petroleum exploration and development of Petrochina.
exploration technologyseismictwo widths and two heightstwo heights processingtrue surface imagingapplication effect
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