涪陵地区飞仙关组储层地球物理响应特征及正演模拟  

Reservoir geophysical response feature and forward modeling of Feixianguan formation in Fuling area,southeastern Sichuan basin

作　　者：胡修权[1] 施泽进[1,2] 王长城[1,2] 郁万里[3] 

机构地区：[1]成都理工大学能源学院,成都610059 [2]成都理工大学"油气藏地质及开发工程"国家重点实验室,成都610059 [3]川庆钻探工程有限公司地质勘探开发研究院,成都610051

出　　处：《地球物理学进展》2014年第3期1148-1156,共9页Progress in Geophysics

基　　金：国家自然科学基金委员会与中国石油化工股份有限公司联合基金(40739903)资助项目

摘　　要：涪陵地区位于"开江-梁平海槽"西侧,存在发育高能相带的地质背景,飞仙关组主要发育白云岩储层和鲕粒灰岩或颗粒灰岩储层.采用地质-地球物理互馈结合的方法,对该区飞仙关组储层开展了地球物理响应特征及正演模拟的研究,结果表明:白云岩储层速度相对致密白云岩有所降低,降低幅度有限,仍高于致密灰岩,在地震剖面上表现为低频强振幅特征;地震响应分析结果显示,迭瓦状前积之上的波谷反射可能是鲕粒灰岩或颗粒灰岩储层发育的有利位置,正演模拟证实,滩顶对应波谷,滩底对应波峰,孔隙发育差异和储层厚度的不同造成振幅强弱有别,滩体延伸长度的不同,可分别形成长轴状与短轴状迭瓦状前积,滩体叠置地方振幅减弱.通过地震异常平面规律的刻画,认为长轴状强振幅迭瓦状前积在研究区最有利,是优先考虑的勘探有利区.Fuling district lies in the west of KaiJiang-LiangPing trough and has a geological background of high-energy facies belts development.Feixianguan formation mainly develops dolomite reservoir, oolitic limestone or grain limestone reservoir. This paper explores the reservoir geophysical response feature and forward modeling of Feixianguan formation by combine the geology and geophysics.The results indicates that the reservoir speed of the dolomite is lower than that of the dense dolomite but higher than the speed of the dense limestone,shows high amplitude with low frequency on the seismic section.The analysis result of seismic response reveals that the trough reflection above imbricate progradation may be the favorable position where the oolitic reservoirs or grain limestone reservoirs develops.Forward modeling proves that the top of bank corresponds to trough while the bottom of bank corresponds to peak;different pore development and the imparity thickness of the reservoir result in amplitude of different intensity;different extension lengths of the bank forms imbricate progradation with long axis or short axis;amplitude is weakened at the overlay position of banks.The description of the seismic anomaly law indicates that imbricate progradation with long axis and strong amplitude is most favorable and preferred site for exploration.

关 键 词：涪陵地区 飞仙关组 白云岩 鲕粒灰岩 地球物理响应 正演模拟 

分 类 号：P631[天文地球—地质矿产勘探]