Eight trace fossil associations in relation to eight depositional facies have been recognized in the Shahejie Formation (Tertiary) of the Dongpu Depression. These are ①Cylindricum Scoyenia(Sand flat and mud flat), ②[WTBX]Ancorichnus Cylindricum [WTBZ](distributary), ③ Tigillites root type A (Lagoon and marsh), ④ Ophiomorpha Ancorichnus (estuarine), ⑤ Thalassinoides Palaeophycos (upper reach estuarine), ⑥ Arenicolites Polykladichnus (tidal channel), ⑦ Teichichnus Anconichnus (shoreface) and ⑧ Squamodictyon Protoplaeodictyon (deep embayment). The environmental implications of the above mentioned trace fossil associations and the importance of the eight recurrent ichnofacies corresponding well log patterns are described. The trace fossil evidence strongly shows that the Shahejie Formation consists mainly of nonmarine deposits as well as marine deposits. Above all, it appears to be quite helpful in high resolution stratigraphic correlations and in predicting incised valley reservoir facies estuarine sand stones and shelf on lap reservoir facies (tidal flat and beach sandstones) in this area, and clean up the debatable blur on whether there are marine or no marine deposits in the Shahejie Formation. ;
About author: Wu Xiantao was born in 1934. As a visiting scholar, he went to University of Swansea, University of Manchester and University of Liverpool in 1980's and 1990's. He is a professor and director of the Fossil Fule Institute in Jiaozuo College of Technology. His current interests focus on ichnology, sedimentology and palaeoecology.
Cite this article:
. SIGNIFICANCE OF ICHNOFACES AND ITS CORRESPONDING WELL LOG
PATTERNS OF SHAHEJIE FORMATION IN DONGPU DEPRESSION[J]. JOURNAL OF PALAEOGEOGRAPHY, 1999, 1(3): 50-64.
. SIGNIFICANCE OF ICHNOFACES AND ITS CORRESPONDING WELL LOG
PATTERNS OF SHAHEJIE FORMATION IN DONGPU DEPRESSION[J]. JOPC, 1999, 1(3): 50-64.
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