塔中东部复杂区多域多方法联合去噪

MULTI-METHODS AND MULTI-FIELD JOINT DE-NOISING TECHNOLOGY IN THE COM⁃PLEX AREA OF EASTERN TAZHONG

塔中东部潜山区继承性古隆起发育,是油气运聚的有利指向区,研究发现了白云岩潜山、灰岩潜山、石炭系生屑灰岩岩性圈闭,具有巨大的勘探前景。但由于研究区地表和地下地质构造复杂,造成地震资料品质差,信噪比低,难以满足油气勘探的需要,为此,根据研究区原始资料噪音发育的特点,结合多年地震资料处理实践经验,提出了分类、分步、分域、分区、分频、分时的“六分法”为指导的去噪思路,使用分频面波压制技术、十字域非均匀采样的相干噪音压制技术、检波域沙丘鸣震压制技术、四维叠前随机噪声去噪技术、tau-p域多次波压制技术系列,提高了地震资料信噪比,为塔中主垒带油气预探评价、落实优质储量提供可靠资料。

As the favorable area for hydrocarbon migration and accumulation,the buried hill of eastern Tazhong is an inherited uplift,where dolomite buried-hill,limestone buried-hill and Carboniferous bioclast limestone lithological traps have been found with great exploration prospect.However,because of complex structures of surface and underground in the researched area,seismic data of the researched area are characterized by poor quality,low signal-to-noise ratio,which is hard to meet the requirements in oil/gas exploration.Therefore,according to the features of noise in the original data in the researched area and combining with many years of experience in seismic data processing,the“six step”de-noising method(by types,by steps,by fields,by blocks,by frequencies,and by times)have been proposed,where frequency-divided surface wave suppression tech⁃nology,cross-domain non-uniform sampling coherent noise elimination technique,tau-p field multiple suppression tech⁃nology have been applied to improve the signal-to-noise ratio,providing reliable data to proven reserve and to evaluate the oil/gas preparatory reconnaissance in the horst zone of Tazhong.