根据AVO相对变化识别流体的新方法  

A new method for fluid identification based on relative changes in AVO

作　　者：付琛 廖键 陈殿远 夏竹君[2] 谢艳华 FU Chen;LIAO jian;CHEN Dianyuan;XIA Zhujun;XIE Yanhua(CNOOC China Limited,Hainan Branch,Haikou,Hainan 570312,China;Shenzhen Engineeing Technology Branch,CNOOC Energy Technology&Services Limited,Shenzhen,Guangdong 518000,China)

机构地区：[1]中海石油(中国)有限公司海南分公司,海南海口570312 [2]中海油能源发展股份有限公司工程技术深圳分公司,广东深圳518000

出　　处：《中国海上油气》2021年第5期62-72,共11页China Offshore Oil and Gas

基　　金：“十三五”国家科技重大专项“莺琼盆地高温高压天然气富集规律与勘探开发关键技术(三期)(编号:2016ZX05024-005)”部分研究成果。

摘　　要：在进行AVO研究过程中发现,某些气田的气层表现出了与水层类似的AVO特征,以致常规的AVO技术很难有效进行流体识别,因此迫切需要探索出新的AVO属性分析技术来进行有效的流体检测。为此,本文以琼东南深水区为例,从该区大量已钻井和正演模型的AVO特征出发,剖析了流体和物性变化对梯度、截距的影响,明晰了不同流体随物性变化时振幅随角度变化的特征规律,即不同物性的同种流体随角度增加振幅差异逐渐减小,而不同流体随角度增加振幅差异逐渐增大,进而提出了一种根据AVO的相对变化来定性识别流体的新方法,并从理论上加以剖析,最终实际应用也证实了该方法的有效性,有效解决了气、水特征类似时常规AVO技术无法进行流体检测的难题。Some gas layers in the gas field exhibit similar amplitude versus offset(AVO)characteristics to water layers.As the conventional AVO technology is difficult to effectively identify fluids,it is imperative to develop a new method of AVO attribute analysis technology based on relative changes in AVO for effective fluid identification.To this end,this paper takes the deep water area of Qiongdongnan as an example,starts from the AVO characteristics of a large number of wells drilled and forward models in this area,analyzes in detail the influences of fluid and physical property changes on gradient and intercept,and clarifies the characteristic law of amplitude variation with angle when different fluids change with physical properties,that is,the amplitude difference of the same fluid with different physical properties decreases with the increase of angle,while the amplitude difference of different fluids increases with the angle,and then propose a new method for fluid identification based on relative changes in AVO and analyzed it theoretically.Finally,the field application also confirms the effectiveness of the method,which effectively solves the problem that conventional AVO technology cannot identify fluids when the characteristics of gas and water are similar.

关 键 词：相对AVO 流体识别 AVO属性 模型正演 流体变化 物性变化 

分 类 号：TE132.1[石油与天然气工程—油气勘探]