辽河拗陷大民屯凹陷S281块高密度宽线二维地震采集实践  

HIGH DENSITY WIDE LINE 2D SEISMIC ACQUISITION PRACTICE IN S281 BLOCK OF DAMINTUN SAG,LIAOHE DEPRESSION

作　　者：赵超峰 田建涛 张伟 韩继伟 付昌 任丽莹 张晴[1] 刘志伟 ZHAO Chao-feng;TIAN Jian-tao;ZHANG Wei;HAN Ji-wei;FU Chang;REN Li-ying;ZHANG Qing;LIU Zhi-wei(Liaohe Geophysical Exploration Company,Bureau of Geophysical Prospecting INC.,CNPC,Panjin 124010,Liaoning Province,China)

机构地区：[1]中国石油集团东方地球物理勘探有限责任公司辽河物探处,辽宁盘锦124010

出　　处：《地质与资源》2024年第2期178-186,共9页Geology and Resources

基　　金：中国石油天然气股份有限公司科研项目“干热岩资源勘探开发关键技术研究”(2022DJ5503);东方地球物理勘探有限责任公司科研项目“地震采集方法基础研究”(03-01-2022).

摘　　要：辽河拗陷大民屯凹陷S281块X井钻井显示该块油气潜力较大,但以往地震资料采集时间早,覆盖次数较低,成像精度差,导致主体断裂位置和微断裂体系难以落实,制约区块成藏解释和后续开发.为此,开展了高密度宽线二维地震资料采集,并基于采集数据开展了观测系统退化分析.研究结果表明,新采集的高密度宽线二维地震成像剖面较以往三维地震成果剖面断点更清晰,断裂系统刻画更清楚,构造形态更自然,层间信息更丰富,信噪比更高,落实了的西部斜坡带的构造特征;超高密度、极小面元对高陡构造和断裂刻画更清楚,是提高复杂地质目标成像的有效方法;退化处理说明S281块的地震资料采集观测系统的面元边长不能大于12.5 m,最大炮检距不能小于3500 m,覆盖次数不能小于1200次.本研究可为大民屯凹陷西部斜坡带的下步地震资料采集和勘探开发提供借鉴.The drilling of well X in S281 block of Damintun sag,Liaohe depression,shows a great oil and gas potential.However,it is difficult to determine the main fault position and microfracture system due to the old acquisition time of previous seismic data,low coverage times and poor imaging precision,which restricts the interpretation of block accumulation and subsequent development.Therefore,the study carries out the high density wide line 2D seismic data acquisition and degradation analysis of the observation system based on the data.The results show that,compared with the previous 3D seismic imaging section,the newly acquired high density wide line 2D seismic imaging section has clearer breakpoints,clearer delineation of fault system,more natural structural configuration,richer interlayer information,and higher signal-to-noise ratio,which accurately realizes the structural characteristics of western slope zone.The ultrahigh density and minimum bin can depict high-steep structures and faults more clearly,which is an effective method to improve the imaging of complex geological targets.The degradation processing indicates that the bin side length of seismic data acquisition and observation system of S281 block should not be greater than 12.5 m,the maximum offset should not be less than 3500 m,and the coverage times should not be less than 1200 times.The study can provide reference for the next seismic data acquisition and exploration in the western slope zone of Damintun sag.

关 键 词：大民屯凹陷 高密度 宽线二维地震采集 小面元 高灵敏度检波器 退化分析 辽河拗陷 

分 类 号：P631.4[天文地球—地质矿产勘探]