A地区地质地震特征分析及关键解释技术研究

Geological and seismic characterization of area A and key interpretation techniques

深地震反射探测是A地区深部三维结构探测项目的重要组成部分之一,在深反射地震采集与常规处理基础上,利用速度谱拟合时深曲线、井孔岩性分层资料、合成地震记录井震标定以及地震地质多信息融合多种方法综合标定该区各层序,然后在标准反射层已充分确定的基础上,根据波组特征识别地层间岩性差异特点进行层位和断层解释,探测到目标地质体的深部空间分布、结构及其属性信息,最后利用附近钻孔连井剖面进行验证和分析,在实际应用中取得了较好的效果,为初步建立深部三维空间地球物理模型框架提供了可靠的基础数据。

The detection of deep seismic reflections is an important task within the deep three-dimensional(3 D)structure exploration project in area A.Based on data acquisition and conventional processing,four methods were implemented to comprehensively calibrate the stratigraphic sequence:velocity spectrum to fit time depth curve,rock property data from boreholes,seismic calibration via synthetic seismic records,and seismic-geological data fusion.After full characterization of the reflection layer,the differences in lithology between strata were identified according to their wave group characteristics,and horizon and fault interpretation were carried out.Then,the spatial characteristics,structure,and attributes of the target deep geological body were detected.Finally,the results were verified using nearby borehole data,revealing a good agreement.This study provides a preliminary but reliable basis for a deep 3 D geophysical model of the study area.