| 山东东营凹陷新生代天文地层表简介 |
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| 作者单位： | 中石化胜利油田有限公司地质科学研究院，中国地震局地质研究所，中国科学院国家天文台 |
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| 摘 要： | 综合山东东营凹陷郝科1等6口井的天文地层研究结果提出"东营凹陷新生代天文地层表",表中列出的是"国际地层表(2004)"、"中国区域年代地层表(2000)"和0—65Ma期间天文偏心率405ka周期编号以及东营凹陷孔店组(顶部)至平原组各组的年龄以及东营凹陷新生代51Ma以来3个大的地层不整合:1)沙河街组二段下部,大约33.8—33.4Ma期间405ka周期振幅不明显、100ka周期较强,与南大西洋33.4—33.7Ma和热带太平洋33.6—33.7Ma期间沉积物中显著转折等特征可作对比;2)东营组-馆陶组界线上下,东营组三角洲顶面最后萎缩时间约为24.467Ma,推测由此至渐新世末(23.03Ma),大约近1.5Myr期间本区没有大的湖泊,而是冲积—河流相沉积,中新世初(23.03Ma)快速隆起,直到约18—16Ma开始馆下段的上部沉积,这一区域性角度不整合面形成大约持续5—7Myr;3)上新统-更新统界线上下,根据本区东辛2-4井古地磁和天文地层研究,测出布容、松山、高斯和吉尔伯特等4个极性时,求出2.546Ma—1.806Ma期间明上(上)亚段顶]可能沉积并剥蚀过的地层厚度为129m;1.806—0.908Ma期间,因构造活动本区上升成为高山,第四系平一段底部形成了大的不整合面。
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| 关 键 词： | 天文地层 不整合 古近系 新近系 第四系 东营凹陷 山东 |
A BRIEF INTRODUCTION TO THE CENOZOIC ASTROSTRATIGRAPHIC TIME SCALE FOR THE DONGYING DEPRESSION,SHANDONG |
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| Authors: | YAO Yi-min XU Dao-yi ZHANG Hai-feng HAN Yan-ben ZHANG Shou-peng YIN Zhi-qiang LI Bao-li HE Qing-fang and BIAN Xue-mei Geological Scientific Research Institute of Shengli Oilfield Company SINOPEC Dongying Institute of Geology China Earthquake Administration Beijing National Astronomical Observatories Chinese Academy of Sciences Beijing |
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| Institution: | YAO Yi-min 1),XU Dao-yi 2),ZHANG Hai-feng 1),HAN Yan-ben 3),ZHANG Shou-peng 1),YIN Zhi-qiang 3),LI Bao-li 1),HE Qing-fang 1) and BIAN Xue-mei 1) 1) Geological Scientific Research Institute of Shengli Oilfield Company,SINOPEC,Dongying,257015, 2) Institute of Geology,China Earthquake Administration,Beijing,100029, 3) National Astronomical Observatories,Chinese Academy of Sciences,Beijing,100012 |
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| Abstract: | Based on the astrostratigraphic studies of the six wells in the Dongying Depression, Shandong Province, a Cenozoic Astrostratigraphic Time Scale (CSATS) for the Dongying Depression is suggested. In the CSATS the "International Stratigraphic Chart" (2004), the "Regional Stratigraphic Chart of China" (2000) and the serial numbers of 405ka period of astronomical eccentricity during 0—65Ma, and also ages of various formations from the top boundary of the Kongdian Formation to Pingyuan Formation have been listed. Morever, it is mentioned, since 51Ma there were three large stratigraphic unconformities: 1) the first is located in the lower part of Member 2 of Shahejie Formation during about 33.8—33.4Ma, during which the amplitude of 405ka period is expressed unclearly and the 100ka period seems rather strong, which could be compared to the abrupt turn characters reported in sediments of the tropical Pacific during 33.6—33.7Ma and of southern Atlantic during 33.4—33.7Ma; 2) the second was near the Dongying Formation-Guantao Formation boundary, the final time of shrinking of top boundary of Dongying delta was about 24.467Ma, and it is estimated that up to the end of Oligocene (23.03Ma) there was no sediments of large lake, but that of alluvial plain and rivers. After Miocene (23.03Ma) this area was uplift rapidly. Started about 1.8Ma there were sediments of the Lower Member of Guantao Formation. Therefore, the duration of this regional and angular unconformity occurred about 5—7Myr; 3) based on the palaeomagnetic and astrostratigraphic studies, before and after the Pliocene-Pleistocene boundary four polarity zones (Brunches, Matuyama, Gauss and Gilbert zones) have been defined. It can be calculated that the strata with 129m thickness at the top of Upper Submember of Upper Member of Minghuazhen Formation during 2.546? ?.806Ma disappeared by later erosion; but at the base of Member 1 of Pingyuan Formation during 1.806 ? ?.908Ma this area was rising and became land. Thus, a large unconformity occurred. |
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| Keywords: | astrostratigraphy unconformity Dongying Formation Paleogene Neogene Dongying Depression Shandong Province |
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