摘要
汶东凹陷为鲁西隆起中-新生界中小型断陷盆地,其泥页岩沉积厚度大、埋藏浅,具有较高页岩油勘探价值.根据中国地质调查局新完钻的汶页1井的钻探资料,分析汶东凹陷大汶口组页岩油发育特征及富集控制因素.汶页1井钻探结果显示,在汶东凹陷沉降中心附近的大汶口组中、上段发育厚度约为500m的有效烃源岩,主要分布于大汶口组上段和中段上亚段;烃类以页岩油形式聚集,含油率普遍大于1.5%,在埋深为440～560和700～820m发育2个页岩油富集层段,具有一定的页岩油资源潜力.研究区大汶口组页岩油的富集规律受沉积环境、有机质丰度和裂隙（层理）发育程度等3个主要因素控制.研究结果表明,深湖-半深湖沉积环境有利于有机质保存,为油气生成提供物质基础;有机质丰度和含油率呈良好正相关关系,决定了研究区大汶口组的生油能力;裂隙（层理）为页岩油提供良好的储集和渗流通道,有利于页岩油的富集成藏.
Wendong sag,one of the small Mesozoic-to-Cenozoic lacustrine rift basins locating in the Luxi uplift,deposits thick Paleocene mudrocks with shallow burial depth and high exploration value. Vertically,development features and enrichment factors of shale oil of the Dawenkou Formation within the sag was analyzed on the basis of data of Well Wenye No.1 drilled by China Geological Survey. The drilling results of Well Wenye No.1 show that about 500 m thick of source rock develops at the middle-to-upper member of the Dawenkou Formation near the subsidence center of Wendong sag. Hydrocarbons accumulate in the ways of shale oil with oil content generally greater than 1.5%. Two shale oil-rich intervals having high hydrocarbon generation potential are found at 440-560 m and 700-820 m underground. The level of vertical enrichment for shale oil in this region depends on depositional setting,TOC abundance and development level of fractures(beddings). Evidence shows semi-deep to deep lacustrine setting is favorable for organic matter preservation which provides fundamental material for hydrocarbon generation;the abundance of organic matter has a positive relationship with oil content,which determines the hydrocarbon generation potential;fractures(beddings)provide better porosity and permeability and make the accumulation of oil possible.
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2016年第6期41-46,共6页
Petroleum Geology and Recovery Efficiency
基金
中国地质调查局"南华北盆地油气资源战略调查"(1211302108023-1)
关键词
大汶口组
页岩油
含油率
控制因素
汶东凹陷
Dawenkou Formation
shale oil
oil content
controlling factor
Wendong sag
作者简介
刘旭锋（1990-）,男,山东东营人,工程师,硕士,从事油气勘探工作.联系电话：17710519604,E-mail：xf-liu23@foxmail.com.
通讯作者：张交东（1968-）,男,山东潍坊人,教授级高级工程师,博士.联系电话：13691390257,E-mail：644184823@qq.com.
