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歧口凹陷下第三系层序地层厚度特征The Paleogene Sequence’s Character of the Thickness in the Qikou Sag
歧口凹陷, 地层厚度, 裂陷, 下第三系Qikou Sag, The Thickness of the Strata, Lacunae, Paleogene
《Advances in Geosciences》, Vol.5 No.6, 2015-12-31
Using the latest research data, in the sequence frame of lacunae in Qikou sag, there are three tec-tonic movements. Studying the thickness and the episodic character is meaningful. From the I la-cunae movement to the III lacunae movement, all single lacunae movement, and tectonic activity showed a trend of weakening in the deep basement right-lateral strike-slip fault zone and regional stretch decollement background under control. To form the overall pattern of tectonic evolution of Qikou sag, there are three zones, four general structural frameworks of concave. The I lacunae movement was expanding rift stage, the II lacunae movement was the stable stage, the III lacunae movement was further weakened.