西藏伦坡拉盆地东部牛堡组沉积层序结构及砂体发育模式  

SEDIMENTARY SEQUENCE STRUCTURE AND SANDBODY DEVELOPMENT MODE OF NIUBAO FORMATION, EASTERN LUNPOLA BASIN, TIBET

作　　者：郝景宇[1] 潘磊[1] 李吉选[1] 李凤[1] 马承宪 张文睿[1] 李旭文[1] 

机构地区：[1]中国石化勘探分公司

出　　处：《天然气勘探与开发》2016年第2期6-12,共7页Natural Gas Exploration and Development

基　　金：国土部油气中心项目(1211302108021-1)"伦坡拉钻井工程及油气资源潜力评价"

摘　　要：以西藏伦坡拉盆地东部始新统牛堡组为例,借助最新地震和钻井资料,根据盆地不同演化阶段首次将牛堡组划分为8个三级层序,建立了等时地层格架,明确了层序要素特征及构成样式。在此基础上,根据岩相、测井相及地震相特征,将沉积体系划分出水下扇、扇三角洲、湖泊和冲积扇4种类型,明确了各层序发育期沉积相展布特征及其对砂体发育的控制作用,总结出断控陡坡带前端砂砾岩体、缓坡扇三角洲砂体、洪水密度流砂砾岩体和湖相透镜状砂体4类储集砂体。综合认为:断控陡坡带前端砂砾岩体是最有利砂体;缓坡扇三角洲砂体是最具勘探潜力的砂体。Based on the latest seismic and drilling data, the Niubao Formation, eastern Lunpola Basin in Tibet, can be classified into 8 six-order sequences according to different evolutional stages. Meanwhile, the isochronal stratigraphic framework is established, and both elemental features and structural framework of these sequences are defined. Then, its sedimentary system can be subdivided into four types of underwater fan, fan deltaic, lacustrine and alluvial fan on the basis of some characteristics of lithological facies, electrofacies, and seismic facies. Many distribution features in different sequence stages and their effect on sandbody development are also identified. At last, a conclusion that there are four types of reservoir sandbody are made, including glutenite body in frontal fault-controlled slope belt, fan deltaic sandbody in gentle slope belt,glutenite body in flood density flow, and lacustrine-facies lenticular sandbody. Results show that the glutenite body in frontal fault-controlled slope belt is the most favorable and the fan deltaic sandbody in gentle slope belt is the most potential one for exploration.

关 键 词：储集砂体 沉积体系 层序构成样式 牛堡组 伦坡拉盆地 

分 类 号：P618.13[天文地球—矿床学]