“两宽一高”地震勘探技术在油气精细勘探中的应用

Application of“wide azimuth,wide broadband,and high density”seismic exploration technology in fine hydrocarbon exploration

近年来,随着油气勘探的深入和精细勘探的需求,“两宽一高”地震勘探技术已经成为油气精细勘探的一种有效技术手段。松辽盆地北部葡萄花油层已进入精细勘探阶段,微小断层识别和油气精确预测是该区增储上产的关键。为了提高断层和油气检测精度,针对松辽盆地北部L45井区葡萄花油层开展基于“两宽一高”地震资料的断层检测和油气预测研究。利用GeoEast软件解释系统,在对比、分析“两宽一高”地震资料与常规地震资料基础上,利用GeoEast软件的构造导向滤波和智能检测技术识别微小断层,利用优势方位油气检测技术检测油气。研究分析表明:“两宽一高”地震资料分辨率和信噪比更高,更有利于开展油气精细勘探;构造导向滤波和智能检测技术是识别微小断层的有效技术手段,优势方位油气检测技术充分利用“两宽一高”地震资料宽频、宽方位特性可以更好地突出油气响应特征。研究成果为“两宽一高”地震资料应用提供了一种新的技术思路,可指导精细构造解释和有利区带评价,为下一步井位部署提供了依据。

In recent years,wide-azimuth,broadband,and high-density(WBH)seismic exploration technology has become an effective technical means to achieve fine hydrocarbon exploration.As the Putaohua reservoir in the northern Songliao Basin has entered the stage of fine exploration,the identification of micro faults and the accurate hydrocarbon prediction are the key to increasing reserves and production in this area.For higher detection accuracy of faults and hydrocarbon,this paper studies fault detection and hydrocarbon prediction on the basis of WBH seismic data in the Putaohua reservoir of the Well L45area in the northern Songliao Basin.Specifically,upon the comparative analysis of WBH seismic data and conventional seismic data,we use the characteristic structureguided filtering and intelligent detection technology of the GeoEast interpretation system for micro fault identification and employ dominant azimuth technology for hydrocarbon detection.The research and analysis show that WBH seismic data have a higher resolution and signal-to-noise ratio(SNR),which is more conducive to fine hydrocarbon exploration.Structure-guided filtering and intelligent detection technology are effective technical means to identify micro faults,and the dominant azimuth technology can better highlight the response characteristics of hydrocarbon by making full use of the broadband and wide-azimuth characteristics of WBH seismic data.The research results render a new technical idea for the application of WBH seismic data,guide the fine structure interpretation and favorable area evaluation,and provide a basis for the subsequent well location deployment in the area.