高密度三维地震技术——老油区二次勘探的关键技术之一

High-density 3-D seismic technique—One of the key techniques of the secondary exploration in old oil region.Qu Shonli.

随着老油区勘探开发的深入,勘探开发的难度越来越大。概括而言,老油区勘探开发面临的难点表现在①勘探目的层埋藏深；②勘探对象多为小断块、小幅度构造和隐性岩性圈闭；③油气藏多为低渗透、特低渗透油气藏；④单元储量规模小等方面。当前的地震资料精度不能满足老油田勘探开发的需求,成为制约勘探开发的重要因素之一。国内外的研究表明,新一代地震技术——高密度三维地震技术,可以大幅度提高地震资料的品质,这对提高老油区勘探开发的成功率有着重要的意义。介绍了高密度三维地震技术及其实现方法,分析了实施高密度三维地震技术的关键问题,给出了国内外高密度三维地震技术的应用实例,展示了高密度三维地震技术的良好应用效果和应用潜力,证明了高密度三维地震技术是老油区二次勘探的关键技术之一。

With the further exploration & development in old oil region, the exploration & development becomes more difficult.The diffi- culties are that 1) the exploration target is deeply buried,2) most of the exploration objects are small fault blocks,micro-amplitude structures and recessive lithologic traps,3) most of the oil/gas ac- cumulation are low or particularly low permeability,and 4) the u- nit storage is small.The accuracy of the recent seismic data cannot meet the needs for exploration & development in old oilfield and becomes an important factor in restraining exploration & develop- ment.The research both at home and abroad shows that the high- density 3-D seismic technique can greatly improve the quality of seismic data,and which is essential to increase the success ratio of exploration & development in old oilfield.The high-density 3-D seismic technique and its implement are introduced,the key prob- lems in this technique are analyzed,the application samples of this technique are given,the good application results and potential of this technique are displayed.All of these have proved that the high-density 3-D seismic technique is a key technique in secondary exploration in old oil region.