三维观测系统关键参数聚焦性影响分析  

Analysis of the influence of key parameters on the focusing property of 3D geometry

作　　者：赵虎[1,2] 杨暾 刘志鹏 胥良君 尹成[1,2] ZHAO Hu;YANG Tun;LIU Zhi-peng;XU Liang-jun;YIN Cheng(Sichuan Province University Key Laboratory of Natural Gas Geology,SWPU,Chengdu 610500,China;School of Geoscisence and Technology,Southwest Petroleum University,Chengdu 610500,China;CNOOC Research Institute,Beijing 100028,China;Southwest Oil and Gasfield Company Chongqing Gas District,Chongqing 400707,China)

机构地区：[1]西南石油大学天然气地质四川省重点实验室,成都610500 [2]西南石油大学地球科学与技术学院,成都610500 [3]中海油研究总院有限责任公司,北京100028 [4]中石油西南油气田分公司重庆气矿,重庆400707

出　　处：《地球物理学进展》2020年第6期2290-2298,共9页Progress in Geophysics

基　　金：国家科技重大专项(2016ZX05024001003);中国石油-西南石油大学创新联合体项目(2020CX010201);西南石油大学青年科技创新团队基金项目(2017CXTD08)联合资助。

摘　　要：随着油气勘探的不断深入,勘探工区越来越复杂,对地震勘探的精度要求也逐渐提高,所以提前预知观测系统成像质量显得尤为重要.观测系统聚焦性分析正是在这一基础上提出来的,它应用共聚焦理论来分析观测系统成像聚焦性能,预知观测系统偏移成像质量,进而优化观测系统采集参数,是面向复杂勘探目标的有效评价方法之一.本文利用双聚焦法,结合BZ291工区基本观测系统参数,利用聚焦束主瓣宽度和主瓣能量比两个参数定量分析方法,分析了不同炮点数、炮线距、接收线距和炮点距等采集参数的聚焦性变化特征,通过分析参数对分辨率曲线的影响,总结出聚焦性能随观测系统参数的变化规律,从而为优选观测系统方案提供新思路,达到进一步提高目的层成像精度的目的.With the deepening of oil and gas exploration, exploration areas become more and more complex, and the accuracy requirements of seismic exploration are gradually improved. Therefore, it is particularly important to predict the imaging quality of geometry in advance. Focusing analysis of geometry is put forward on this basis. It uses confocal theory to analyze imaging focusing performance of geometry, predict migration imaging quality of geometry, and optimize acquisition parameters of geometry. It is one of the effective evaluation methods for complex exploration targets. In this paper, a quantitative analysis method based on two parameters of the main lobe width and the energy ratio of the main lobe is proposed. The focusing characteristics of acquisition parameters such as different source number, source line spacing, receiver line spacing and source interval are analyzed by using double focusing analysis method and combining with the basic geometry parameters of BZ291 area. By analyzing the influence of parameters on the resolution curve, the variation rule of focusing performance with the parameters of the geometry is summarized, and then the variation rule of focusing performance with the parameters of the geometry is concluded. Thus, a new idea is provided to optimize the geometry scheme, and the imaging accuracy of the target layer is further improved.

关 键 词：双聚焦 观测系统参数 聚焦性能 参数论证 

分 类 号：P631[天文地球—地质矿产勘探]