利用地震模拟技术研究逆断层的断点位置

Using Seismic Simulation Technology to Locate Reverse Fault Intersecting Points

在地震资料解释阶段,可根据解释结果进行正演模拟,以验证解释结果的可靠性,并通过模型正演方式了解地下波场的细微变化,提高解释精度。依据内蒙古鄂托克前旗沙章图矿区DF2逆断层的赋存形态,建立的地质模型,并围绕其逆断层的断点位置、埋深、地层速度等,对各种接收排列进行射线追踪实验。通过改变开动的道数、道距及偏移距,观察各种参数下射线追踪的分布情况及模拟时间剖面的面貌。正演结果表明利用射线模型追踪的模拟地震反射剖面与实际时间剖面完全吻合,其确定的逆断层断点位置及断面倾角合理。

During seismic data interpretation stage can carry out forward simulation based on interpreted result to validate reliability of interpretation;and through model forward mode find out minute variations of underground wave field to promote interpretation accura-cy. Based on geological model on the basis of occurrence morphology of reverse fault DF2 in Sazant mine area, Otog Front Banner, In-ner Mongolia, around issues of reverse fault intersecting point location, buried depth, seismic-wave velocity etc. carried out ray tracing experiment for various receiver arrangements. Through changing actuated trace number, trace intervals and offsets, observed distribu-tion of ray tracing and simulation time section features under different parameters. Forward results have shown that using ray model traced simulation seismic reflection sections are exact tally with actual time section, determined reverse fault intersecting point and fault plane dip angle are reasonable.