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陡构造在四川油气地震勘探中占有重要地位。陡构造地形复杂,出露地层岩性变化大,反射界面陡曲,层状结构被断层切割,表层和深处地震地质条件复杂;记录剖面多变,图象奇异,资料处理和解释有若干特殊性。文中介绍了陡构造山区动静校正的做法,在各种偏移方法中,肯定了变范围等效速度二维绕射扫描偏移的效果,指出各种偏移的局限性;比较了影象追踪法;提出以变范围偏移做初始模型结合正演,逐次逼近求得相对准确的地质解释剖面,以及应用变范围等效速度偏移使复杂的深部断块基本归位,影象射线追踪将构造高点归位。通过实例说明对陡构造山地区地震资料的处理、解释技术已有显著进展和成效。
Steep structures occupy an important position in Sichuan oil and gas exploration. The steep terrain is complex, the lithology of exposed strata varies greatly, the reflection interface is steeply curved, the stratiform structure is cut by faults, and the geological and geological conditions of the surface layer and the deep are complex. The recording profiles are varied and the images are singular. There are some special data processing and interpretation Sex. In this paper, the method of dynamic and static correction in steep tectonic mountainous area is introduced. In all kinds of offset methods, the effect of two-dimensional diffraction scan with variable-range equivalent velocity is confirmed, and the limitations of various offsets are pointed out. This paper proposes a method to initialize the initial model with a variable range offset and forward approximation to obtain a relatively accurate geological interpretation profile by successive approximation and the application of a variable range equivalent velocity offset to make the complex deep fault block basic homing. Construction high point homing. An example is given to illustrate the processing of seismic data in steep tectonically-faulty mountains. Significant advances and achievements have been made in explaining the techniques.