断陷盆地陡坡带高精度地震勘探技术应用

本文以河南泌阳凹陷为例,从散射波波动方程正演着手,分析大断面地震波散射场的物理机制和特点,结合叠前偏移处理需要进行观测系统论证。采集上主要运用模型约束正演技术优选采集参数,并采取了主要解决山前激发能量问题的技术措施;资料处理上主要应用了基于精细速度建模的叠前深度偏移成像处理方法;解释上通过可视化构造成图分析陡坡砂砾岩体的分布规律和发育期次,并运用沟扇对应理论,结合地震相分析、层拉平水平切片分析、属性分析等方法,预测砂砾岩体分布区带和层位。部署探井并取得了成功,相继在凹陷南部陡坡带发现了两个富集含油区块。

High-precision Seismic Exploration Techniques and Application on the Abrupt Slope Belt of Faulted Basin

Taking Biyang Sag in Henan province as example,based on the need of the pre-stack migration processing and analysis of the physical mechanism and characteristics of seismic wave scattering field in large section,a scattering wave equation forward is used.The methods for acquisition are optimization parameters model forward technique,and some technical measures for solving the excitation energy in piedmont belt of the sag.For handling method,the applications of fine velocity modeling based on pre-stack depth migration imaging method is used.For interpretation,based on visual constructed map,the distribution of steep sand-conglomerate and developmental period are analyzed,and the distribution of a new sand-conglomerate horizon zone is predicted through the groove and fan corresponding theory,combined with seismic facies analysis,the layer equalize the level of slice analysis,attribute analysis and other methods etc.According to research result more wildcat are obtained successful through drilling,and two oil-rich block in the southern abrupt slope belt of the sag are found.