渤海油田复杂地区定向照明地震采集技术应用研究

Application and Study of Directionally Illuminated Acquisition Technology in the Complex Area of Bohai Oilfield

陈昌旭 周滨 张建峰 李江 王志亮 吴尧 李岩

CHEN Changxu ZHOU Bin ZHANG Jianfeng LI Jiang WANG Zhiliang WU Yao LI Yan

中海石油(中国) 有限公司天津分公司, 天津 300452; 中海油能源发展股份有限公司工程技术分公司, 天津 300452

CNOOC China Limited, Tianjin Branch, Tianjin 300452, China; CNOOC EnerTech-Drilling & Production Co. Tianjin 300452, China

随着渤海油田勘探程度不断加深，地震勘探开始向寻找小断层、小断块及岩性地层圈闭等小尺度地质目标方向转变，现有的地震采集技术在复杂构造区的成像已经不满足要求。此文以已有资料为基础，针对复杂地区的地震采集成像问题建立地质模型，围绕目标构造在地表进行有针对性的炮点和检波点布设，对目标区域进行定向照明分析，得到有利于目标地质体准确成像的观测系统。本项目在野外采集时全工区应用6L8S360R正交观测系统采集，只在目标区域增加应用6L2S240R观测系统的采集，进行局部加密覆盖。最终资料显示定向照明地震采集技术可有效提高复杂地质目标的照明度和成像质量，并且降低了采集成本。

With the development of oil and gas exploration in Bohai Oilfield,seismic exploration has turned to the small-scale geological targets,such as small faults,small fault blocks and lithologic-formation traps.The imaging acquired by the conventional seismic technology can not meet the requirement of the exploration in the complex structural area.Based on the existing data,the authors established a geological model for resolving the seismic acquisition and imaging problems in the complex area,laid out the specific shot points and receivers around the target structure,conducted the directional illumination analysis of the target area,and designed the geometry that is beneficial to the accurate imaging of the geological target.The orthogonal geometry named 6L8S360R was used in the acquisition of whole area,and with 6L2S240R in some target areas for the locally dense coverage.The results demonstrate that the directionally illuminated acquisition technology can effectively improve the illumination and imaging quality of complex geological target,and reduce the acquisition cost.

https://doi.org/10.3969/j.issn.1008-2336.2017.02.008