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作 者:柯光明[1] 郑荣才[1] 罗清林[2] 雷光明[2] 谢春红[1]
机构地区:[1]成都理工大学沉积地质研究院,四川成都610059 [2]四川石油管理局地质勘探开发院重庆录井站,重庆401120
出 处:《沉积与特提斯地质》2007年第2期60-65,共6页Sedimentary Geology and Tethyan Geology
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)。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 asynunetrical (A type) and deepening- and then shallowing- upward synunetrical (C type) types, and five subtypes according to the sizes of accommodation spaces and thickness of upper and lower semicycles: "deepening"- upward asynunetrical (Al type) of low accommodation spaces; "deepening"- upward asynunetrical (A2 type) of high accommodation spaces; rising semicycle-dominated incompletely synunetrical type (C1 type); nearly completely to completely synunetrical type (C2 type), and falling semicycle-dominated incompletely synunetrical type (C3 type).
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