松辽盆地青山口组页岩沉积水体环境演变的古生物学证据

doi:10.11743/ogg20230405

Abstract

Abstract:

Identification of target intervals and delineation of favorable areas for exploration and development of the Gulong shale oil require better reconstruction of the paleowater environment during deposition of the shale of interest. Paleontological communities were used as indicators to trace the paleowater environment of ancient lakes to perform a comprehensive analysis of paleotological evidence （including fish， clam shrimp， ostracoda and algae） of the Qingshankou Formation from the Well GY8HC. The results show that Manchurichthys and clam shrimp only occur in the Q7 oil layer with large abundance but single species. Compared with the lower Q1—Q6 oil layers， there is a significant increase in the species and abundance of ostracods in the upper Q7—Q9 oil layers. Three abundance peaks of dinoflagellate fossils appear in Q1， Q2 and Q7 oil layers. The biological assemblage indicates a whole freshwater-brackish water feature of the Songliao Basin during the deposition of the Qingshankou Formation. The significant increase in diversity of fossil record and peak abundances of dinoflagellate fossils in Q7 oil layer indicates relatively definite marine transgression events， while the abundance peaks of dinoflagellate fossils in Q1 and Q2 oil layers suggest possible marine transgression event（s） in the early stage of lake-level rising. Through the comparison with the modern Maracaibo Lake， it is proposed that the appearance of marine organisms in the paleo-Songliao Lake during the deposition of the Qingshankou Formation might be the result of temporary or occasional lake-sea connection under unique paleogeographic and climatic backgrounds. However， the lake-sea connection did not cause any obvious change in the nature of water body and the components of ecosystem.

Key words: paleowater environment, marine transgression event, paleontology, black shale, Qingshankou Formation, Songliao Basin

CLC Number:

TE121.3

Dan LYU, Huajian WANG, Gang LI, Jiangyong ZHANG, Xiuli FU, Chang LIU, Xiaomei WANG, Rukai ZHU, Shuichang ZHANG. Paleobiological evidence of the paleowater environment evolution during deposition of the Qingshankou shale in the Songliao Basin[J]. Oil & Gas Geology, 2023, 44(4): 857-868.

Figures/Tables 9

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Paleobiological evidence of the paleowater environment evolution during deposition of the Qingshankou shale in the Songliao Basin

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