基于差分算子的薄层弱信号检测方法  

A Weak Signal Identification of Thin Interbedded Based on Difference Operator

作　　者：沈伟正[1] 齐志洋 徐振旺 彭仁艳 陈伟 

机构地区：[1]长江大学石油工程学院,武汉430100 [2]长庆油田第五采油厂,西安718600 [3]辽河油田勘探开发研究院,盘锦124010 [4]中石化石油工程地球物理公司华东分公司,南京210000 [5]油气资源与勘探技术教育部重点实验室(长江大学) [6]非常规油气湖北省协同创新中心,武汉430100

出　　处：《科学技术与工程》2016年第26期1-7,共7页Science Technology and Engineering

基　　金：国家自然科学基金(41304108)资助

摘　　要：随着石油勘探程度的提高,新勘探的目标更加隐蔽,表现出圈闭规模小,储层厚度薄等特点,特别是砂泥岩薄互储层,地震反射信号微弱,常规地震资料难以准确识别,制约了精细构造解释、精细储层预测及圈闭落实程度。为了解决实际地震资料中的薄层弱信号检测问题,发展了一种能增强弱信号能量且不会抬高高频噪音的差分算子技术。该方法利用原始地震道的高斯平滑衍变地震道抬升薄层弱信号的低频段能量,利用原始地震道的偶数阶衍变地震道抬升薄层弱信号的高频段能量,并将输出地震道经过完全总体经验模态分解(CEEMD)算法处理以压制高频的衍生干扰信息。数值模拟以及实际资料均验证了该方法的高效性。With the improvement of oil exploration,the good exploration block is becoming increasingly hidden,such as the small size and thin interbedded reservoirs. Especially for the thin sand-shale reservoirs,seismic reflection signal is weak,and the conventional seismic data processing technology is difficult to accurately identify the seismic response,which lead to structure interpretation and reservoir prediction mistakes. In order to solve the weak signal detection problem in the thin layer seismic data,a difference operator technique was propased to enhance the weak signal energy,while suppress the high frequency noise. The method using the Gaussian smoothing evolvement of initial trace to enhance the low frequency band energy of thin layer,and using the even order development seismic trace from original seismic trace to enhance the high frequency band energy,and using the empirical mode decomposition（ CEEMD） algorithm to suppress the high frequency interference derived processing. Numerical simulation and real data validate the efficiency of the proposed method.

关 键 词：差分算子 薄层 弱信号 经验模态分解 

分 类 号：P631.443[天文地球—地质矿产勘探]