Abstract:
The Ordovician carbonate fractured-cavern reservoir, as the main oil pay zone in Tahe Oilfield, is characterized by strong heterogeneity, deep-buried, low-precision 3D seismic data, which cannot meet the needs for the further exploration and development.Aiming at the characteristics of the fractured-cavern reservoirs in the area, combining with the field tests and application of seismic acquisition techniques in the past years, a high-precision seismic acquisition technique facing oilfield development was proposed by analysis and optimization on three key steps including geometry design, geophone receiving and noise suppression, seismic wave shooting.Firstly, the orthogonal three-dimensional slow-rolling geometry consisting of small grid, high fold, long arrangement, wide-azimuth and big trace number is utilized.Secondly, "品" shape array is applied to receive records, meanwhile, the specific noise in old oil area is suppressed by some measures such as reducing motor speed.Thirdly, we shoot at the optimal shooting depth below water table and ignore the impact of "low-frequency section".The application of high-precision 3D seismic acquisition in East10 area and West10 area in Tahe Oilfield proves the effectiveness of the technique.