砂岩储层AVO特征影响因素的不确定性研究

doi:10.3969/j.issn.0001-5733.2011.06.018

CORC > 北京大学 > 地球与空间科学学院

	砂岩储层AVO特征影响因素的不确定性研究; The uncertainty analysis of the key factors that affect the AVO attributes in sandstone reservoir
	何涛 ; 史謌 ; 邹长春 ; 任科英 ; 裴发根
刊名	地球物理学报
	2011
关键词	砂岩储层 AVO交会图不确定性概率密度函数岩石物理模型 Sandstone reservoir AVO crossplot Uncertainty Probability density function Rock physics model
DOI	10.3969/j.issn.0001-5733.2011.06.018
英文摘要	传统的地震AVO正演研究多采用参数固定的岩石物理模型,而实际地层属性参数在勘探范围内具有不确定性.本研究以目标地层岩芯样品的实验室测试数据为基础,通过样品孔隙度和干燥状态下纵、横波阻抗的高度线性关系对岩石物理模型进行了简化,并结合实验测量和测井解释建立了主要模型参数的概率密度函数.采用Monte-Carlo随机正演和Gassmann流体替换技术,对模型参数不确定性与地震AVO响应关系的研究表明,模型饱和不同流体时的AVO截距-斜率点束的分布形态和偏离饱水背景趋势线的程度受盖层泥岩速度的不确定性影响非常大,而储层砂岩孔隙度的不确定性也有明显影响.正确解释实际地震AVO异常的关键,是将岩石物理模型的参数合理地概率化,通过正演模拟来获得储层物性和流体信息的最大可能性.; Traditional seismic AVO forward study normally uses constant parameters to construct rock physics model, but these parameters in real formations have uncertainties across exploration area. Using laboratory measurements of cores from target formation, the rock physics model was simplified with relationships of reservoir sandstone porosities and P- and S-wave impedances in dry condition. To study influences of model parameter uncertainties, the probability density functions of key model parameters were introduced based on core measurement and well logging analysis. Using Monte-Carlo method and Gassmann fluid replacement technique, the AVO responses of models were obtained for saturation fluids as brine, oil and gas. The comparative analysis indicates that the velocity uncertainty of covering mud is the primary factor affecting the fluid cluster's distribution and deviation from water background trend on AVO intercept-gradient crossplots, while the porosity uncertainty of sand is also significantly affecting but less than covering mud. Thus, the correct interpretation of AVO anomalies for real seismic data requires forward simulation on probabilistic rock physics model to find out the most likely reservoir and fluid characters.; 国家自然科学基金; 教育部留学回国人员科研启动基金; 中国海洋石油有限公司湛江分公司研究院攻关项目; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000292366900018&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; SCI(E); 中文核心期刊要目总览(PKU); 中国科技核心期刊(ISTIC); 中国科学引文数据库(CSCD); 2; 6; 1584-1591; 54
语种	中文
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/239647]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	何涛,史謌,邹长春,等. 砂岩储层AVO特征影响因素的不确定性研究, The uncertainty analysis of the key factors that affect the AVO attributes in sandstone reservoir[J]. 地球物理学报,2011.
APA	何涛,史謌,邹长春,任科英,&裴发根.(2011).砂岩储层AVO特征影响因素的不确定性研究.地球物理学报.
MLA	何涛,et al."砂岩储层AVO特征影响因素的不确定性研究".地球物理学报 (2011).