华南地震

珠江口盆地东部YP油区不同油田主力油藏均为断层圈闭油藏，断层引起的地层横向速度变化导致该区地震资料大量存在断层影响畸变成像区，给该区构造评价带来挑战。传统解决断层阴影一般采用多方位或宽方位地震资料重采集或针对断层成像的目标性处理等，其涉及采集费用高，处理周期长。本文提出利用地层倾角属性定量刻画断层阴影带范围，然后再结合YP油区海相地层横向分布稳定的地质特征，引入支持向量回归算法计算该区高精度非线性构造趋势面，在该趋势面的约束下完成对断层阴影带畸变区域构造进行重新恢复预测。理论模型试算和YP油区某油田实例均显示该方法有较大应用潜力。

The main reservoirs in different fields in the YP oil region of the eastern Pearl River Estuary Basin are all fault-locked reservoirs. A large amount of seismic data in this area has fault-influenced distortion imaging zones，which poses a challenge to the tectonic evaluation of the area. Traditional solutions to fault shadows generally use reacquisition of multi-directional seismic data or targeted processing for fault imaging，which involves the acquisition of high cost and long processing cycle. This paper proposed to quantitatively depict the shadow zone range of faults using 3D stratigraphic dip attributes，and then combired it with the lateral distribution of marine stratigraphy features in the YP oil region. the paper introduced a support vector regression algorithm to calculate a high-precision nonlinear tectonic trend surface in the area. Under the constraint of this trend surface，the paper completed the prediction of distortion area structure of the fault shadow zone. The theoretical model test calculations and the production application of an oil field in the YP oil region show that the method has a great potential for application.

引言
1 方法
2 实例
3 结论

图1 断层阴影带数值模拟<br/>Fig.1 Numerical simulation of fault shadow zone

图1 断层阴影带数值模拟
Fig.1 Numerical simulation of fault shadow zone

图2 断层阴影带刻画及恢复<br/>Fig.2 Delineation and restoration of fault shadow zone

图2 断层阴影带刻画及恢复
Fig.2 Delineation and restoration of fault shadow zone

图3 地震剖面
Fig.3 Seismic profile

图4 地层倾角属性剖面
Fig.4 Stratigraphic dip profile

图5 地层倾角属性与构造叠合图<br/>Fig.5 Overlay map of stratigraphic dip and structure

图5 地层倾角属性与构造叠合图
Fig.5 Overlay map of stratigraphic dip and structure

图6 去除畸变后构造<br/>Fig.6 Structure after removal of distortion

图6 去除畸变后构造
Fig.6 Structure after removal of distortion

图7 SVR趋势面
Fig.7 SVR trend surface

图8 SVR趋势面约束恢复构造<br/>Fig.8 Restored structure under the constraint of；SVR trend surface

图8 SVR趋势面约束恢复构造
Fig.8 Restored structure under the constraint of；SVR trend surface

图9 畸变构造恢复前后深度误差对比图<br/>Fig.9 Comparison of depth error before and after restoration of distorted structure

图9 畸变构造恢复前后深度误差对比图
Fig.9 Comparison of depth error before and after restoration of distorted structure

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备注

引言

1 方法

2 实例

3 结论

期刊信息