Sequence Stratigraphic Models of Depression and Faulted-down Lake Basins

ZHU Xiao-min; KANG An; WANG Gui-wen

Under the guidance of theory of sequence stratigraphy originated from the study of marine basins in continental margin, this paper analyzed thoroughly the characteristics of basin texture and sediment filling sequence in Chinese Mesozoic-Cenozoic depression and faulted down lake basins, used the geological and geophysical data,took the Junggar ,Qaidam , Shongliao and Bohaibay basins as the cases for studying sequence stratigraphy, and pointed out the key of continental sequence stratigraphy study is to determine sequence boundary, first and maximum lake flooding surfaces. It does show that topographic break may be recognized in some depression and faulted down lacustrine basins. Therefore, the sequence stratigraphic models have been built in depression lake basin with or without topographic break. One sequence in depression lake basin with topographic break is composed of lowstand, transgressive and highstand systems tracts, but the sequence in depression lake basin without topographic break only is made up of transgressive and regressive systems tracts. In faulted down lake basin, there are some growth faults in gentle slope of a basin, the different activity of the growth fault produced a topographic change and formed a topographic break, so the sequence stratigraphic model of faulted down lake basin with topographic break has been built, which consists of lowstand, trangressive and highstand systems tracts .Also, this paper has discussed how to determine first and maximum flooding surfaces and sequence boundary according to geological, well-logging and seismic data.

University of Petroleum, Beijing 102249

Received Date: 2002-04-05

Rev Recd Date: 2002-06-24

Publish Date: 2003-06-10

Key words:

Abstract: Under the guidance of theory of sequence stratigraphy originated from the study of marine basins in continental margin, this paper analyzed thoroughly the characteristics of basin texture and sediment filling sequence in Chinese Mesozoic-Cenozoic depression and faulted down lake basins, used the geological and geophysical data,took the Junggar ,Qaidam , Shongliao and Bohaibay basins as the cases for studying sequence stratigraphy, and pointed out the key of continental sequence stratigraphy study is to determine sequence boundary, first and maximum lake flooding surfaces. It does show that topographic break may be recognized in some depression and faulted down lacustrine basins. Therefore, the sequence stratigraphic models have been built in depression lake basin with or without topographic break. One sequence in depression lake basin with topographic break is composed of lowstand, transgressive and highstand systems tracts, but the sequence in depression lake basin without topographic break only is made up of transgressive and regressive systems tracts. In faulted down lake basin, there are some growth faults in gentle slope of a basin, the different activity of the growth fault produced a topographic change and formed a topographic break, so the sequence stratigraphic model of faulted down lake basin with topographic break has been built, which consists of lowstand, trangressive and highstand systems tracts .Also, this paper has discussed how to determine first and maximum flooding surfaces and sequence boundary according to geological, well-logging and seismic data.

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Sequence Stratigraphic Models of Depression and Faulted-down Lake Basins

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