|Table of Contents|

Storm Deposits of Shallow Lake in Lower Submember of Member 2 of Shahejie Formation of Wennan-Liuzhuang Area,Dongpu Sag(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2011年第04期
Page:
384-389
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Storm Deposits of Shallow Lake in Lower Submember of Member 2 of Shahejie Formation of Wennan-Liuzhuang Area,Dongpu Sag
Author(s):
WANG Wei
Geological Scientific Research Institute, Shengli Oilfield, China Petroleum and Chemical Corporation,Dongying 257015, Shandong, China
Keywords:
storm deposit;  Bouma Sequence;  lower submember of member 2 of Shahejie Formation;  Paleogene;  shallow water lake;  Dongpu Sag
PACS:
TE121.3;P618.13
DOI:
-
Abstract:
Storm deposit is a kind of special event deposit, and reveals palaeogeography and palaeoclimatology changes of certain period in certain region. Through the palaeogeography research and fine strata division, the evidence and characteristic of storm deposit of shallow lake in lower submember of member 2 of Shahejie Formation of Wennan-Liuzhuang Area, Dongpu Depression were discussed, and the sedimentary model of storm deposit was summarized. The results showed that deposition sequence of lake basin was mainly controlled by climate, so the frequent climate change resulted in the wide distribution and multi-period development of storm deposit; storm deposit mainly developed in lake transgressive system tract(TST)and highstand system tract(HST), and developed in deep water during the early deposit, and the distribution range enlarged during the later deposit; storm deposit, which could be the assistant mark for strata sequence division, generally occurred around the boundary of each sand group, and was taken as a event deposit with short term and isochronous; the sedimentary models of storm deposit mainly included class I and class II; class I storm deposit was similar to that developed in deep water, and developed A-D interval deposits which was similar to Bouma Sequence, but the granularity was thinner than that of storm deposit developed in deep water, and mostly developed in relatively deep water of flood-over-lake depositional environment; class II storm deposit did not develop the B and D interval deposits; when the storm stopped, if the storm flow was closer to the center of lake basin, the sedimentary characteristic was more similar to class I storm deposit, otherwise, it was more similar to class II.

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Last Update: 2011-12-20