物探化探计算技术
物探化探計算技術
물탐화탐계산기술
COMPUTING TECHNIQUES FOR GEOPHYSICAL AND GEOCHEMICAL EXPLORATION
2015年
2期
242-248
,共7页
中值滤波%最小速度差和最小厚度原理%声波曲线方波化%尺度匹配
中值濾波%最小速度差和最小厚度原理%聲波麯線方波化%呎度匹配
중치려파%최소속도차화최소후도원리%성파곡선방파화%척도필배
median filtering%the principle of minimum speed deviation and minimum thickness%square wave of acoustic log curve%scale matching
声测井资料和地震资料在纵向上尺度差异较大，因此实现二者的尺度匹配是声测井资料标定地震资料的前提。针对常规井震资料尺度匹配过程中可能会丢失声测井数据局部信息的缺点，在深时转换前采用最小速度差以及最小厚度原理对声测井数据进行精细分层处理：首先采用变时窗的中值滤波对声测井资料进行预处理，降低噪声的影响；然后根据最小速度差以及最小厚度原理对声测井资料进行分层，分层参数最小速度差由目的层的具体情况决定，最小厚度则由地震采样间隔以及最小单层双程旅行时决定；最后把分层后的声测井曲线进行深时转换，并按地震采样间隔进行重采样。对实际的声测井资料处理表明，该方法在保留声测井数据的局部信息上具有一定优势，为提高井震标定精度奠定了基础。
聲測井資料和地震資料在縱嚮上呎度差異較大，因此實現二者的呎度匹配是聲測井資料標定地震資料的前提。針對常規井震資料呎度匹配過程中可能會丟失聲測井數據跼部信息的缺點，在深時轉換前採用最小速度差以及最小厚度原理對聲測井數據進行精細分層處理：首先採用變時窗的中值濾波對聲測井資料進行預處理，降低譟聲的影響；然後根據最小速度差以及最小厚度原理對聲測井資料進行分層，分層參數最小速度差由目的層的具體情況決定，最小厚度則由地震採樣間隔以及最小單層雙程旅行時決定；最後把分層後的聲測井麯線進行深時轉換，併按地震採樣間隔進行重採樣。對實際的聲測井資料處理錶明，該方法在保留聲測井數據的跼部信息上具有一定優勢，為提高井震標定精度奠定瞭基礎。
성측정자료화지진자료재종향상척도차이교대，인차실현이자적척도필배시성측정자료표정지진자료적전제。침대상규정진자료척도필배과정중가능회주실성측정수거국부신식적결점，재심시전환전채용최소속도차이급최소후도원리대성측정수거진행정세분층처리：수선채용변시창적중치려파대성측정자료진행예처리，강저조성적영향；연후근거최소속도차이급최소후도원리대성측정자료진행분층，분층삼수최소속도차유목적층적구체정황결정，최소후도칙유지진채양간격이급최소단층쌍정여행시결정；최후파분층후적성측정곡선진행심시전환，병안지진채양간격진행중채양。대실제적성측정자료처리표명，해방법재보류성측정수거적국부신식상구유일정우세，위제고정진표정정도전정료기출。
There is a big scale difference between acoustic log data and seismic data in vertical,therefore,the comparison of synthetic seismogram and seismic data at well is on the premise of achieving scale matching.The conventional method for scale matching between acoustic log data and seismic data may result in losing the local information of acoustic log data.Aiming at the deficiencies of the conventional method,we employ the principle of minimum speed deviation and minimum thickness to stratify acoustic log data before depth-time conversion.Firstly,we employ the median filtering with variable scales windows to preprocess acoustic log data,which can reduce the effect of noise.Secondly,we stratify the acoustic log curve according to the principle of minimum speed deviation and minimum thickness;stratified parameters are determined by the specific objective layer,seismic sampling interval and minimum two-way travel time,respectively.Finally,we transform the stratified acoustic log curve from depth domain to time domain and resample the acoustic log data in time domain according to seismic sampling in-terval.The model test shows that the method in this paper can remain more thin-layer information than conventional method, and laying the foundation of improving the accuracy of well-seismic calibration.
