Application of seismic fusion processing technology in Weixi complex fault area
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摘要:
涠西探区经历了始新世到渐新世应力的转变，工区内断裂复杂。受断层和地层破碎等因素的影响，现有的地震资料普遍存在同相轴的接触关系模糊、断层不够清晰等问题。为了进一步提高断层成像精度，明确断层组合关系，精细落实构造圈闭，对2套不同年代采集的2个方位的地震数据进行融合处理，实现多方位地震信息的有效融合，增加地震照明方向，改善拓宽频带范围、道集覆盖次数及速度分析精度及多次波压制及陡倾角成像效果。通过方位融合处理重点解决小断层准确归位问题，信噪比、分辨率、频带宽度以及保幅性得到提高；断面清晰、断层组合关系清楚，断裂成像质量明显改善。通过不同方位资料的融合处理，为涠西地区的下部勘探部署提供了坚实的数据基础。
Abstract:The Weixi exploration area has experienced the stress transformation during the Eocene to Oligocene, thus featuring complex fault systems in the work area. Due to the influence of faults and strata fragmentation, many problems occurred in the seismic data, such as the blurry contact of seismic event, unclear fault, and so on. To further improve the accuracy of fault imaging, clarify the relationship among fault assemblages, and precisely implement structural traps, two sets of seismic data in two directions and different ages were used to realize the effective fusion of multi-directional seismic information, increase the seismic illumination from different directions, improve the extension of frequency band, and improve the accuracy of track coverage times and velocity. The effect of multiple suppression and steep dip imaging was improved. Through fusion process from different directions, the issue of accurate homing of small faults was solved, and the signal-to-noise ratio, resolution, bandwidth and amplitude preservation were enhanced. The fault section and the fault combination relationship became clear, and the fault imaging quality was largely improved. Via the fusion of data in different directions, a rich and solid database for the future exploration in the Weixi area was established.
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Key words:
- Weixi exploration area /
- fusion processing /
- tomography /
- seismic event
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表 1 不同年度采集参数对比
Table 1. Comparison of acquisition parameters in different years
采集时间 2005年 2016年 电缆长度/m 4 050 6 000 记录道数 324*2 480*8 电缆沉放深度/m 7 6 道间距/m 12.5 12.5 采样间隔/ms 2 1 记录长度/ms 5 000 5 120 采集方向 150.5°/330.5° 0°/180° 震源容量/cuin 2 250 4 350 震源压力/psi 2 000 psi 2 000 炮间距/m 25 25 （双源） 覆盖次数 40.5 80 
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