Citation: | JING Xigui, LI Fengjie, ZHANG Da, LI Ning, MIAO He, DING Rui. 2023. Nenjiang Formation 1 member Ichnocoenosis and its deposit environment of Upper Cretaceous from Yaonan 5 well, Songliao Basin[J]. Geology in China, 50(6): 1848-1856. doi: 10.12029/gc20200523001 |
This paper is the result of oil and gas exploration engineering.
Abundant trace fossils were preserved in Upper Cretaceous strata in Songliao Basin, but related studies mainly focus on the northern part of the Songliao Basin. The sedimentary environment of section 1 of the Nenjiang Formation was restored by trace fossils identification in the southern part of the Songliao Basin, and this paper will provide evidence to support subsequent trace fossil studies in this area.
According toobserve wells of Yaonan 5 drill core of section 1 of the Nenjiang Formation, we identified 2 ichnogenus and 2 ichnospecies including Chondrites and Planolites, and established Chondrites-Planolites ichnocoenosis. Combining with ichnofossils surrounding rock, burrow scale, record of well logging curve to analyse trace maker habit; According well of Yaonan 5 sampling, measured sample contents of Uranium, Thorium, Vanadium, Nickel and Cobalt; Using U/Th, V/(V + Ni) and Ni/Co methods to restore trace fossil preservation strata paleo-oxygen facies of section 1 of the Nenjiang Formation.
This study suggests that Chondrites-Planolites ichnocoenosis were formed in deep water environment with weak water energy; Paleo-oxigenation facies data analysis suggests that method of U/Th indicated oxic environment, methods ofV/(V + Ni) and Ni/Co indicated dysaerobic-anaerobic environment.
The trace fossils were preserved in mudstone in well Yaonan 5 with small burrow diameter scale and low abundance, indicating the water was anoxic. Combined with the paleooxygen facies data and logging curve analysis, considering that tracemaker were living in semi-deep lake which with low energy and poor oxygen content.
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Locaion of study area (modified from Zheng Yulong et al., 2005)
Sedimentary facies distribution of K2n1 in the Songliao Basin (modified from Feng Zhiqiang et al., 2012)
Nenjiang Formation 1 member trace fossils distribution and sedimentary column of Upper Cretaceous from Yaonan 5 well
Nenjiang formation 1 member photographs of fossils, trace fossils and rock cores of Upper Cretaceous from Yaonan 5 well
Ichnofacies and its environmental distribution pattern (modified from Seilacher, 1967)