罗家单点高密度三维地震与效果

Single-point high-density 3D seismic and its application in Luojia area

罗家地区位于济阳坳陷沾化凹陷西部,该区三维地震勘探始于20世纪90年代,先后实施了常规三维地震、二次采集三维地震、高精度三维地震,发现了中生界-东营组6套含油层系,属于中等勘探程度地区.现有地震资料虽然发现了多个构造为主的油气藏,但是难以满足勘探开发中后期红层、滩坝、浊积岩等储层描述和圈闭刻画的需求.2017年,在罗家地区部署实施了高密度地震,使用陆用压电单点检波器接收,采用小面元、宽方位、高覆盖的观测方式,炮道密度达到了357万道/km^2.单点接收地震资料具有保真度高、波场信息丰富、宽频带、宽方位的特点,针对单点高密度地震资料特点,应用相对保真的宽频宽方位处理技术,成像地震剖面纵、横向分辨率和保真度有了较大提高,对推动中国东部老油田开展三次地震具有积极的借鉴意义.

Luojia area is a medium exploration block,located in the west of Zhanhua sag in Jiyang depression.Since the 90 s of the 20 th century,seismic exploration in this area began has developed from the conventional 3 D seismic and the secondary 3 D seismic to the high-precision seismic.Although a number of structural reservoirs have been discovered based on the acquired seismic data,such as 6 sets of oil-bearing strata of the Mesozoic-Dongying Formation,it is difficult to meet the requirements of reservoir description and trap characterization in the middle and later stage of exploration and development,such as red beds,beach-bar deposits and turbidities.In 2017,high-density seismic data acquisition was deployed in Luojia area by single-point receiving technique with land piezoelectric detectors.This 3 D seismic used small-bin-size,wide-azimuth,and high-coverage observations,with a density of 3570000 traces per km^2 and the new seismic data has characteristics of high fidelity,rich wave field information,wide frequency range and wide azimuth.According to the characteristics of single-point high-density seismic data,the vertical and horizontal resolution and fidelity of the imaging seismic section have been greatly improved by using the wide-bandwidth azimuth processing technology of relative fidelity.Single-point high-density seismic has promising effect on the third 3 D seismic of oil fields in the eastern China.