Astrostratigraphic research on the Neogene Minghuazhen Formation in Dongying Sag，Shandong Province
Xu Daoyi1, Yao Yimin2, Han Yanben3, Yin Zhiqiang3, Zhang Haifeng2
1 Institute of Geology，China Earthquake Administration，Beijing 100029 2 Geological Science Research Institute，Shengli Oilfield，SINOPEC，Dongying 257015，Shandong 3 Institute of National Astronomical Observatories，Chinese Academy of Sciences，Beijing 100012
Abstract The Minghuazhen Formation(in a narrow sense)in the Dongying Sag is correlated to the upper part of Minghuazhen Formation(in a broad sense)in the Bohai Bay area. The logging data of 5 wells from the Minghuazhen Formation in the Dongying Sag have been selected for this astrostratigraphic study. The age of the top boundary of Minghuazhen Formation in Dongxin Well 2-4,which is located in Dongxin area, is 2.588 Ma BP. It is taken as the age of the top boundary of Minghuazhen Formation of the above-mentioned 5 wells. Based on the results of spectral analyses，digital filter and wavelet analysis，the accumulation rates and duration time of various members of the Minghuazhen Formation have been calculated. The results indicate that the average age of bottom boundary of the Minghuazhen Formation is 10.794 Ma BP，and the average age of bottom boundary of the upper part of Minghuazhen Formation(Member 3)is 5.121 Ma BP. Therefore，the lower member of Minghuazhen Formation(Mingxia Member)corresponds to the Late Miocene of International Stratigraphic Chart(2004)or the Baodean Stage of China Regional Stratigraphic Chart(2002). The Mingshang Member corresponds to the Gaozhuangian and Mazegouian Stages.During 11-5 Ma BP，there were several sudden environmental changes. A rather strong change happened at about 10.873 Ma BP，a weak one at about 8.9 Ma BP，one stronger than the previous at about 7 Ma BP，and the last quite strong change happened at about 5.11 Ma BP. According to the research results derived from astrostratigraphy，astronomical periods and tectono-climatic cycles，a duration time 2Ma of sudden change may have occurred，which is consistent with some of the regional or global stratigraphic boundaries.
About author: Xu Daoyi，born in 1934，is a research professor of Institute of Geology，China Earthquake Administration，and is mainly engaged in mathematical geology，astrogeology etc.
Cite this article:
Xu Daoyi,Yao Yimin,Han Yanben et al. Astrostratigraphic research on the Neogene Minghuazhen Formation in Dongying Sag，Shandong Province[J]. JOURNAL OF PALAEOGEOGRAPHY, 2008, 10(3): 287-296.
Xu Daoyi,Yao Yimin,Han Yanben et al. Astrostratigraphic research on the Neogene Minghuazhen Formation in Dongying Sag，Shandong Province[J]. JOPC, 2008, 10(3): 287-296.
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