苏里格气田地震资料叠前保幅去噪技术研究

为了满足岩性勘探的需要,苏里格地区开展了高密度地震采集方法.采集技术的进步极大的提高了地震记录的品质,同时对开展以岩性预测为目标的保幅处理提出了更高的要求.而叠前去噪作为室内去噪处理的主战场,在保幅处理中起到重要作用.本文针对苏里格地区地震资料干扰波类型多、背景噪音强的特点,采用多域多方法联合去噪思路,对叠前地震数据上的噪声采用分频压制线性及异常强能量干扰、自适应单频波衰减及高精度反假频去除多次波等保幅去噪方法.在提高信噪比的同时,达到保幅处理效果,提高了处理结果的可靠性,使钻井成功率大大提高,从而大幅度提高了苏里格气田的经济效益.该技术系列对国内其它低孔低渗致密砂岩油气藏研究同样具有借鉴意义.

Study of the amplitude preserved denoising techology for prestack seismic data in Sulige Gasfield

Acquistion of high density spatial sampling is conducted to meet the need of lithorlogy exploration in Sulige Gasfield.The progress of acquistion technology extremely improves the quality of seismic data,then amplitude preserved processing method which aimed to recognize lithologic reservoir is more required in seismic processing;As the main battleground of noise attunation in house,prestack denoising plays an important role in relative amplitude preserved processing.In the light of there are too many types of interference waves and strong background noises to be attenuated in Sulige Gasfield,the denoising method is applied according to the approach of multi domain integrated multi method;the amplitude preserved processing method such as attunation of linear and high amplitude noise based on frequency-divided,adaptively mono-frequency noise attenuation and high resolution,de-aliased multiple attunation are selected to the prestack seismic data;The S/N ratio is improved and the effect of amplitude preserved is acquired at the same time after denoising,the method enhanced the reliability of the processing result also,then the drilling success rate is raised,the economic benefit of gasfield development improves greatly also with the method.Domestic other low-porosity and low-permeability of close sand oil and gas reservoir research also has draw lessons from the technic series.