Abstract：In the light of the near surface condition and subsurfacegeologic structure,in middle一south Erlian Depression a geologic model is established;and a series of corresponding mathematic models are derived.According to the requirement of depth,velocity and highest frequency,we plot a set of curves,which are spatial sampling interval versus signal wavelength,maximum offset vs reflector depth and velocity, array length vs frequency and dip,shot depth vs ghost，and so on,Taese curves make the acquisition parameters more reasonable.Tn order to ascertain the lower Cretaceous reservoir bed at thedepth of 580m,we must get clear reflection at 0.3 seconds, keep 50 Hz high frequency content,and have the ability to distinguish a geologic body whose thickness is 40 m,and length 300 m.Therefore,in field data acquisition,high multiplicity,end-on spread with 50m array length,low instrument sensit ivity and resonable shot factors must be used so that high S/N ratio in shallow bed is obtained,and over modulation eliminated, It is shown from the practice that the optimum acquisition parameters determined by quantitative analysis can keep 50 Hz effect ive seismic wave, improve shallow data and the resolution of special geologic bodies, and enhance high dip reflections.
收稿日期: 1984-09-11
引用本文:
蔡为方, 阎万朝. 二连盆地中南部最佳采集因素设计及效果分析[J]. 石油地球物理勘探, 1985, 20(3): 265-278.
Cai Weifang, Yan Wanchao. The design of optimum acquisition parameters for middle-south. OGP, 1985, 20(3): 265-278.
