地震反演中的三维复杂约束模型

Research of 3-D complex constrained model in seismic inversion

地震反演中约束信息模型的建立,特别是多井、断裂发育区的三维复杂约束模型的建立,是地震波阻抗约束反演中的关键技术环节,对反演质量有着重要影响。运用地震、地质综合分析方法,系统地研究了测井资料垂向井孔轨迹约束、地质层位横向控制约束、断块约束、地层沉积模式和接触关系约束等三维约束模型的关键要素。在三维复杂构造和沉积框架关系建立、约束信息三维空间内插外推以及二次修正方法研究的基础上,建立了包括逆断层在内的复杂断裂约束模型以及河道、盐丘(或礁体)和地层缺失等地层沉积模型。通过对胜利油田牛庄地区三维复杂区块实际约束模型的建立和反演,证明了该方法行之有效,大大提高了反演结果的精度,取得了良好的应用效果。

The construction of constrained information model in seismic constrained inversion, especially the 3-D complex constraint model construction in the zone with multiple well and fault developing, is the vital step of seismic constrained impedance inversion and has an important effect on inversion. Some key factors of 3-D constrained model were systematically researched with the combination of seismic and geological method. The factors include trajectory constrain by vertical borehole, laterally controlling constrain by geological horizon, faulting block constrain, stratigraphic sedimentary pattern and contact correlation. On the basis of 3-D complex structure, construction of sedimentary framework correlation and interpolation and extrapolation in 3-D space and secondary modification of the constraining data, 3-D complex constrained model of faulting including reverse fault and the stratigraphic sedimentary model of channel, salt dome or reef and sequence missing were established. The construction of actual constrained model and inversion application in the 3-D complex area of Shengli Oilfield verify the validation of the method. The accuracy of seismic impedance constrained inversion was significantly improved, and a good geologic application effect was achieved.