基于依赖频率AVO反演的高含气饱和度储层预测方法

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英文篇名：High gas-saturation reservoir prediction based on frequency-dependent AVO inversion 作者：罗鑫 ; 陈学华 ; 张杰 ; 蒋伟 ; 孙雷鸣 ; 肖为 英文作者：LUO Xin;CHEN Xuehua;ZHANG Jie;JIANG Wei;SUN Leiming;XIAO Wei;Key Laboratory of Earth Exploration and Information Techniques,Ministry of Education,Chengdu University of Technology;State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation,Chengdu University of Technology;Data Processing Company,Geophysical Branch,China Oilfield Services Limited,CNOOC; 关键词：依赖频率的AVO ; 频散 ; 衰减 ; 含气饱和度 ; 储层预测 英文关键词：frequency-dependent AVO;;dispersion;;attenuation;;gas saturation;;reservoir prediction 中文刊名：SYDQ 英文刊名：Oil Geophysical Prospecting 机构：成都理工大学地球勘探与信息技术教育部重点实验室;成都理工大学油气藏地质及开发工程国家重点实验室;中海油田服务股份有限公司物探事业部特普公司; 出版日期：2019-04-15 出版单位：石油地球物理勘探 年：2019 期：v.54 基金：国家自然科学基金项目“致密储层裂缝系统诱发地震异常的机理及其与产能的关系”(41874143);“含流体弱能量暗点储层的地震识别机理与方法”(41574130);; 国家“十三·五”科技重大专项“各尺度碳酸盐岩裂缝储层结构的地震精细描述研究”(2016ZX05014-001-009);; 四川省青年科技创新研究团队项目“油气地球物理勘探”(2016TD0023)联合资助 语种：中文; 页：SYDQ201902014 页数：10 CN：02 ISSN：13-1095/TE 分类号：8+126-134

摘要

常规的叠前或叠后反演得到的弹性参数对储层含气饱和度的敏感性很弱,较难识别高含气饱和度有效储层。为此,利用依赖频率的AVO反演得到的频散参数预测高含气饱和度的有效储层。首先引入Refutas公式,分析了饱和度对混合流体黏度的影响,结合动态等效介质理论和Wood公式,分析了含气饱和度对速度频散和衰减的影响;再基于f-μ-ρ反射系数公式,实现了依赖频率的AVO反演,并优选了敏感频散因子。结果表明:①不同流体的频散和衰减程度不同,并且依赖含水(含气)饱和度的变化;②优选的频散属性对流体储层具有很强的敏感性,且受背景干扰小,可以精确地刻画高含气饱和度储层的空间分布位置。
        Elastic parameters obtained by conventional preor post-stack inversions are not sensitive to gas saturation of reservoirs.Therefore,we use dispersion parameters obtained by frequency-dependent AVO inversion to predict high gas-saturation reservoirs.First the influence of sand-reservoir saturation on viscosity of different fluid mixtures is analyzed with Refutas equation;and the influence of gas-saturation on velocity dispersion and attenuation is analyzed with the dynamic equivalent-medium theory and Woods formula.Then the frequency-dependent AVO inversion is achieved based on f-μ-ρ AVO approximation;and the sensitive dispersion factor is optimized.The following phenomena are obtained in results:(1)Different fluids have different dispersion and attenuation,and dispersion and attenuation are dependent on water or gas saturation;(2)The optimized dispersion factor is more sensitive to high gas-saturation reservoirs and less affected by the background,which can accurately depict the spatial distribution of high gas-saturation reservoirs.

引文

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