CAJ | 학술논문

可控震源进行地震勘探时，可以利用基于接收阵列的时域地震波束形成方法（TSBBRA）来提高信噪比。如果背景噪声很强，需要增大TSBBRA方法控制参数N来提高信噪比，但伴随的问题是波束会变窄，当主波束不能覆盖整个接收排列时，会造成单炮记录上有效波束范围较窄，仍难以满足数据处理过程要求。针对上述问题，提出一种基于接收阵列的余弦振幅加权定向地震波束形成方法（SDBCAD）。SDBCAD方法通过在接收端对各单炮记录进行余弦振幅加权，然后进行时域延时叠加形成定向地震波。论文合成了TSBBRA方法与SDBCAD方法下的地震数据，结果表明在TSBBRA方法的主波束无法覆盖整个观测系统时，合理利用SDBCAD方法可令地震波束展宽，更好覆盖接收排列。可见，SDBCAD方法在控制波束形态上具有适当展宽定向地震波束的能力，合理利用可改善数据质量。
가공진원진행지진감탐시，가이이용기우접수진렬적시역지진파속형성방법（TSBBRA）래제고신조비。여과배경조성흔강，수요증대TSBBRA방법공제삼수N래제고신조비，단반수적문제시파속회변착，당주파속불능복개정개접수배렬시，회조성단포기록상유효파속범위교착，잉난이만족수거처리과정요구。침대상술문제，제출일충기우접수진렬적여현진폭가권정향지진파속형성방법（SDBCAD）。SDBCAD방법통과재접수단대각단포기록진행여현진폭가권，연후진행시역연시첩가형성정향지진파。논문합성료TSBBRA방법여SDBCAD방법하적지진수거，결과표명재TSBBRA방법적주파속무법복개정개관측계통시，합리이용SDBCAD방법가령지진파속전관，경호복개접수배렬。가견，SDBCAD방법재공제파속형태상구유괄당전관정향지진파속적능력，합리이용가개선수거질량。
We can use “time domain seismic beam-forming based on receiver array”(TSBBRA)to improve signal-to-noise ratio (SNR)when controlled source is used in seismic exploration.If the background-noise is very strong,SNR can be improved by enlarging the parameter N of TSBBRA.With the N increasing,the seismic beam will become narrower.When the beam does not cover the receiver array,the SNR of receiver array will not great enough to meet the requirements of seismic data processing.In order to improve the SNR of single shot record,we propose“Seismic Directional Beam-forming with the Cosine Amplitude Distribution”(SDBCAD),which is also based on beam-forming theory.SDBCAD generates directional seismic records by introducing cosine amplitude distribution in beam-form-ing processing.We simulate the seismic data of TSBBRA and SDBCAD,and the results show that when the beam of TSBBRA can’t cov-er the receiver array,the beam of SDBCAD can be broadened to cover the receiver array.These demonstrate that SDBCAD is better on beam shape control than TSBBRA.Rational use of SDBCAD can improve the quality of seismic data.