Abstract：In view of issue in the structural position of Sebei gas field in Sanhu area of the east of Qaidam Basin that the natural gas leaking resulted in P-wave events push-down,weakening the amplitude and lowering the frequency,making the imaging result obvious deterioration and incapable to accurately describe the structural attitude,it is necessary to improve the imaging precision in gas chimney area and distinguish between true and false gas-bearing anomaly. For that reason,the multi-component exploration experience with explosive source for shooting and 3-C digital receiver for receiving was carried out in that region,which gained a complete record of various wavefields. Ii is seen from the correlation between various records that the feature of PS-wave reflections is obvious,among which there are PS-wave reflections in plane wave area of horizontal component. The paper analyzed in detail the wavefield by using VSP and 3-C land seismic data,carried out predictive deconvelution for the data of horizontal component in multi-component seismic data,better compressing seismic wavelet and eliminating ringing; based on near-surface model created by 3-C uphole survey and in the aid of computation of statics of PS converted wave at receiver,the accurate S-wave statics at shot and receiver points ware finally obtained,making the PS converted wave better imaging that greatly improved the imaging precision in gas chimney area.
李彦鹏, 孙鹏远, 魏庚雨, 唐东磊, 何永清. 利用陆上三分量数据改善气云区构造成像[J]. 石油地球物理勘探, 2009, 44(4): 417-424.
Li Yan-peng, Sun Peng-yuan, Wei Geng-yu, Tang Dong-lei, He Yong-qing. Using 3-C land seismic data to improve structural imaging in gas chimney area. OGP, 2009, 44(4): 417-424.
