陆相层序地层划分及岩芯、测井高分辨率层序地层界面判识

A DIVISION OF CONTINENTAL SEQUENCE STRATIGRAPHY AND THE IDENTIFICATION OF ITS INTERFACE WITH HIGH RESOLUTION CORE ANALYSES AND WELL-LOGGING

董清水 崔宝琛 李想 郭巍

Dong Qingshui Cui Baochen Li Xiang Guo Wei

长春地质学院, 130026

Changchun College of Ceology

本文提出了陆相盆地中存在有3种叠加方式4种类型的准层序组,即Ⅰ、Ⅱ型加积准层序组,进积准层序组及退积准层序组;论证了陆相层序地层学4分方案的可行性,并建议使用湖泊枯水体系域(LDST)、湖泊扩展体系域(LEST)、湖泊丰水体系域(LF－ST)以及湖泊萎缩体系域(LWST)等术语;总结出了层序界面的4种类型—区域角度不整合面、火山-局部不整合面、湖盆萎缩最大暴露冲刷面及区域性超覆不整合面;指出了生物富集层和油页岩的底界面以及低能量细碎屑与下伏钙质团决和滑塌构造层之间的界面是准层序界面,而规模较大的水深突增岩相界面、较厚的滑塌构造层顶界面以及颜色突然变深的较厚泥质沉积物分界面可作为准层序界面。

In a continental basin there are four types of parasequence with three patterns of overlappings, i. e. Ⅰ,Ⅱ typed aggradational parasequence set, aggressive parasequence set and regressive parasequence set I thereby the paper discussed the feasibility of the four-division plan for continental sequence stratigraphy, and proposed the terms of lacustrine dry system tract (LDST), lacustrine extend system tract (LEST), and lacustrine wrinkle system tract (LWST). It is summarized that sequence interfaces may be clarified into four types: regional angled unconformable contact, vocano-local unconformable contact, maximum exposural flushing surface of lacustrine wrinkle and regional onlapping unconformable contact, etc. Finally the paper suggested the followings may be considered as interfaces of parasequence: the bottom interface of oil-shale and organic-rich layer; the interface between the low-energy fine clastics and underlying calcareous concretion and slump structural layer, the rock facial plane characterized by a large scale abrupt increase of water depth I the top interface of a thick slump structural layer;and a thick muddy sedimental interface characterized by an abrupt color mutation.

https://doi.org/10.11781/sysydz199702121