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| | In MX area, Tarim basin,there are serious static mis ties between the seismic data collected in the early period of exploration and that in recent years because of the complex near surface conditions of desert. During data processing, we examined the refracted first break carefully and tried to use the EGRM 2D refraction static to compute the datum static value of shots and receivers. The practical processing results show that the serious mis tie problem has been solved satisfactorily. | | 塔里木盆地MX地区 ,地表为沙漠 ,复杂的近地表条件造成有些早期采集的老测线和新测线之间存在着严重的静校正闭合差。在处理中我们应用扩展广义互换折射波静校正方法 ,通过对该地区折射初至波、低速层速度等参数的详细分析和合理选择 ,重新连片计算了基准面静校正量 ,实际处理后较好地解决了MX地区资料的静校正闭合差问题 ,取得了很好的效果 | | 文摘来源 | | The small scale structure of deep layers in the central area of Tarim basin have good future in petroleum accumulation. But because the structure have lower reality, so geologist is difficult in deciding a well location. If 2 D seismic data is used for doing structure map, this make small scale structure have lower reliable. For added the reliance of small scale structure in 2 D seismic data, we give out processing idea: In time domain, static mistie and the S/N ratio of 2 D seismic data are resolved; in... | | 塔里木盆地塔中地区深层低幅度构造是有利的含油气区 ,但因构造探明程度低 ,很难准确确定钻探井位 ,再加上一些地区利用二维地震资料做构造图 ,使得小幅度构造的可靠性进一步降低。为了在利用二维地震资料条件下提高深层小幅度构造的可靠性 ,进一步提高构造成像的真实性 ,提出了如下研究思路 :在时间域解决近地表静校正闭合差和提高资料信噪比 ;在深度域消除相交测线的速度闭合差 ;进行二维叠前深度偏移连片处理。基于这种思路 ,在时间域首先对每条二维测线做初至折射静校正 ,以便消除由近地表引起的剖面闭合差。然后利用二维测线按照三维叠前深度偏移方法建立全区统一的速度场 ,并从该速度场中抽取每条二维测线的叠前深度偏移速度场 ,使每条二维测线准确成像。从最终结果来看 ,新剖面较老剖面在信噪比和成像精度上有较大的提高 ,新落实的小幅度构造与井分层数据吻合较好。因此认为 ,依据所提思路和方法进行连片处理较好地解决了中深层低幅度构造的成像问题。 | | 文摘来源 | |   |
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