由于“气云区”逸散气体分布的不均衡,造成了平面范围内地震资料受浅层气影响的程度存在很大差异,使得“气云区”的时间构造图不能精确地转换为深度构造图,进而增大了构造误差带来的油气藏开发风险.通过把受浅层气影响程度与地震方差数据体的平面属性结合起来,运用实际油田资料建立了目的层之上方差体振幅之和属性与“气云区”浅层气的总体影响程度之间的数学关系式.渤中29-4油气田应用效果表明,运用该数学关系式可以得到较为准确的砂体深度构造图,为油气田开发提供可信的构造信息,从而成功规避因构造误差而带来的开发风险.%Within a "gas cloud area", there are great differences in the shallow gas influence on areal seismic data, because of an uneven distribution of escaping gas, and the time maps can not be accuratelly transformed into the depth maps, thus increasing the reservoir development risk from structural errors. By combining the shallow gas influence with the areal attribute of seismic variance cube, some actual oilfield data were used to establish a relational expression between the sum of variance cube amplitude over a target formation and the total shallow gas influence whith a "gas cloud area". Its application in BZ29-4 oilfield has shown that this relational expression can generate more accurate depth maps, provide reliable structure information for field development, and avoid the development risk from structural errors.
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