摘要
利用地震剖面和连井剖面,结合岩心和测井等资料,通过恢复三角洲前积层的高度,探讨东营凹陷古近纪沙三中时期三角洲沉积时的最大古水深。结果表明,东营凹陷沙三中时期发育了很好的建设性三角洲,尤以在牛庄洼陷一带前积层非常发育;五个地震剖面的统计结果揭示了三角洲前积层的平均高度在485 m,校正后反演的覆水深度在681 m,说明东营三角洲在形成时期的湖泊古水深可达485~681 m;三角洲前积层主要为一套细粒沉积,以灰色粉砂岩和暗色泥岩为主,粉砂岩中常含漂浮泥砾,是一种沿三角洲前缘斜坡发育的砂质碎屑流和浊流沉积,进一步反映了深水的沉积环境。
Based on seismic profile and well-tie profile, the paper discusses the paleo-water depth of the lake through the study of the delta sedimentation during the Paleogene middle Es3 period in Dongying Depression, NE China, by means of combining core and well logging data and restoring the height of delta foresets. Results show that constructive deltas develop well, and the delta foresets develop extremely well especially in Niuzhuang sag. The statistical results of five seismic profiles reveal the average height of delta foresets is485 m and the inversion overlying water depth after correction is 681 m. Therefore, the lake ′ s paleo water depth in Dongying delta can reach up to 485-681 m at the middle Es3 period. The delta foreset is mainly a set of fine-grain sediments, grey siltstone and dark mudstone as the major. The siltstone often contains floating boulder clay. These features reveal that it is a kind of sandy debris flow and turbidity deposition along the delta front slope, further reflecting a deep-water sedimentary environment.
出处
《高校地质学报》
CAS
CSCD
北大核心
2015年第2期320-327,共8页
Geological Journal of China Universities
基金
国家自然科学基金(41172093)资助项目
关键词
古水深
古湖泊
三角洲
沙河街
前积层
东营凹陷
古近系
paleo-water depth
paleo-lake
delta
Shahejie Formation
foreset
Dongying Depression
Paleogene
