Abstract：The design of 3-D VSP geometry depends on number of shots on surface, number of geophones available in well, offset, depth of receiver point, distribution of shots and receiver points. Designing reasonable geometry can improve 3-D imaging results around borehole. Generally, we can evaluate the reasonability of 3-D VSP geometry design by such bin attributes as folds and offsets. The paper studied the influences of offsets,folds and distribution of shots and receiver points on surveying scope and folds of P-wave and converted wave, and got following knowledge by computation and analysis: (1)the shallower the depth of receiver points and the larger the off sets, the larger the surveyed area; (2)the surveyed area of PS-wave is less than that of PP-wave; (3)in a condition fixing number of receivers and distribution of shot points, increasing adequately the interval of receiver points is advantageous to the uniform folds; (4)in a condition of ring-like or bunch-like distribution of shot points, the folds are uniform and uniformity of PP-wave and PS-wave is basically equivalent when the shot-point spacing is equivalent to shot line interval.
王建民, 刘洋, 魏修成. 三维VSP观测系统设计研究[J]. 石油地球物理勘探, 2007, 42(5): 489-494.
Wang Jian-min, Lin Yang, Wei Xin-cheng. Study on design of 3-D VSP geometry. OGP, 2007, 42(5): 489-494.
