西藏伦坡拉盆地牛堡组层序地层与沉积充填模式  

Sequence stratigraphic framework and sedimentary model of Niubao Formation in Lunpola Basin,central Tibet

作　　者：魏巍[1,2] 陆永潮[1,2] 刘中戎[3] 潘磊[3] 林卫兵[1,2] 蹇慧[1,2] 

机构地区：[1]中国地质大学(武汉)构造与油气资源教育部重点实验室,武汉430074 [2]中国地质大学(武汉)资源学院,武汉430074 [3]中国石化勘探南方分公司,成都610041

出　　处：《石油实验地质》2017年第1期32-40,共9页Petroleum Geology & Experiment

基　　金：国家重点基础研究发展计划("973"计划)项目(SQ2013CB021013);国家自然科学基金项目(41002045)资助

摘　　要：通过对伦坡拉盆地的地震、测井、岩心、露头等资料的综合分析,建立了伦坡拉盆地牛堡组的层序地层格架,将牛堡组划分为1个一级层序,3个二级层序(对应于牛一段、牛二段、牛三段地层),7个三级层序(自下而上依次为SQ1、SQ2、SQ3、SQ4、SQ5、SQ6和SQ7);依据牛堡组的层序地层特征,归纳出弯折带型和断坡带型2种层序构成样式。弯折带型层序构成样式中,高位体系域在缓坡区发育的扇三角洲、低位体系域在坡折内发育的大型低位扇,以及断坡带型层序构成样式中,坡折内发育的高位辫状河三角洲与大型低位扇,为勘探储层的有利目标。通过对各层序的沉积体系时空展布的研究,建立了研究区牛堡组沉积期的沉积模式,并认为该时期主要发育3大连片砂体,即北部、西南部和东部砂体,砂体的展布受坡折带控制明显。Based on an integrated investigation of well logging,seismic data,cores and outcrops,the Niubao Formation in the Lunpola Basin was subdivided into one first order sequence,three second order sequences,corresponding to the first,second and third members of Niubao Formation,and seven third order sequences from base to top,namely SQ1,SQ2,SQ3,SQ4,SQ5,SQ6,and SQ7. Two sequence stratigraphic patterns including faulted slope zone and flexure slope break zone were identified within the sequence stratigraphic framework. There are several exploration targets,including fan deltas on the gentle slope of HST and large-scale low stand fans in the slope break zone of LST in the flexure slope break zone,and high stand braided river deltas and large-scale low stand fans in the slope break zone in the faulted slope zone. A sedimentary model was established through the analyses of spatial and temporal distribution of the sequences. Three main sand bodies developed in the Niubao Formation,namely the northern,southwestern and eastern sand bodies,and their distribution was controlled by the slope break zone.

关 键 词：沉积充填模式 层序地层 牛堡组 古近系 伦坡拉盆地 

分 类 号：TE121.3[石油与天然气工程—油气勘探]