The short-term base-level cyclic sequences in the Xujiahe and Penglaizhen Formations in the southern part of western Sichuan depression
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摘要: 本文运用短期基准面旋回界面的识别标志,将川西坳陷南部须家河组—蓬莱镇组短期基准面旋回层序划分为向上“变深”非对称型(A型)和向上变深复变浅的对称型(C型)两种基本结构类型;再根据可容纳空间大小和上下两个半旋回的厚度,进一步划分为5个亚类型:低可容纳空间向上“变深”非对称型(A1型),高可容纳空间向上“变深”非对称型(A2型),以上升半旋回为主的不完全对称型(C1型),近完全—完全对称型(C2型),以下降半旋回为主的不完全对称型(C3型)。Abstract: The short-term base-level cyclic sequences in the Xujiahe Formation-Pengliazhen Formation in the southern part of western Sichuan depression are separated, according to the criteria for the recognition of the short-term base-level cyclic boundaries, into two types:"deepening"-upward asymmetrical (A type)and deepening-and then shallowingupward symmetrical (C type)types, and five subtypes according to the sizes of accommodation spaces and thickness of upper and lower semicycles:"deepening"-upward asymmetrical (A1 type)of low accommodation spaces; "deepening"-upward asymmetrical (A2 type)of high accommodation spaces; rising semicycle-dominated incompletely symmetrical type (C1 type); nearly completely to completely symmetrical type (C2 type), and falling semicycle-dominated incompletely symmetrical type (C3 type).
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