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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 the seismic data and the continuous well profile, combined with the data of core and well logging, the maximum paleo-water depth of the sediments in the delta of the Middle Triassic during the Paleogene in Dongying Sag was studied by restoring the height of the former sediments. The results show that there are well-developed deltas developed during the Eocene S3 in the Dongying depression, especially in the Niuzhuang sub-depression. The statistical results of the five seismic profiles reveal that the average height of the former sediments in the delta is 485 m, the water depth of inverted inversion is 681 m, indicating that the ancient water depth of the lake in the formation of the Dongying Delta was 485 ~ 681 m; the former of the delta was mainly composed of fine-grained sediments. The gray siltstone and the dark mudstone were Main, siltstone often contains floating debris, which is a sandy debris flow and turbidite deposition developed along the delta front slope, further reflecting the sedimentary environment of deep water.