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东营凹陷沙三下亚段油页岩中古湖泊学信息
引用本文:王慧中,梅洪明.东营凹陷沙三下亚段油页岩中古湖泊学信息[J].同济大学学报(自然科学版),1998,26(3):315-319.
作者姓名:王慧中  梅洪明
作者单位:同济大学海洋地质开放实验室!上海,00092,同济大学海洋地质开放实验室!上海,00092
摘    要:通过沉积学、矿物学、地球化学以及数学模拟计算表明,沙三下亚段油页岩纹泥状的律层段形成于具有明显分层的较深湖区,是湖盘内部水体的生物与化学环境对季节性气候变动的直接响应,其中夏季环境效应起着关键性的作用.总的来说,当时湖底是处于严重缺氧的环境,有利于油气的生成与保存,但显微生物扰动构造以及事件性细层的发现说明这种严重缺氧环境并不十分稳定,常遭周期性充氧事件的干扰.虽然湖水分层毋庸置疑,但是否达到盐度明显分层的程度,或是否属温度/盐度混合分层目前尚难定论.

关 键 词:油页岩  纹泥状韵律  季节气候旋回  湖水分层  缺氧环境  数学模拟

Paleolimnological Information from the Oil Shale in the Lower Part of Sha 3 Formation, in Dongying Depression
Whng Huizhong, Mei Hongmig.Paleolimnological Information from the Oil Shale in the Lower Part of Sha 3 Formation, in Dongying Depression[J].Journal of Tongji University(Natural Science),1998,26(3):315-319.
Authors:Whng Huizhong  Mei Hongmig
Abstract: Basedd on studies of sedimentology, mineralogy, geochemistry and mathematical modeling, it is shown that varved rhythmic couples of oil shale in the lower part of Sha 3 formation formed in the deeper and stratified water, and resulted from the biological and chemical environmental variation responding to the seasonal cycles, in which warmer summers played a critical role. As a whole, the bettom water in Dongying Lake was in an extremely anoxic environment, contributing to the formation and preservation for oil and gas. The discovery of micro-bioturbation and layers caused by events, however, show that the serious anoxic environment was not quite stable, being disturbed frequently by periodic oxygenation events. It seems indubitable that the water in Dongying Lake was stratified duriing this stage,but it is hard to draw a conclusion whether the straified water was caused by salinity or by hoth temperature and salinity effects.
Keywords:Oil shale  Laminated couple  Seasoal cycle  Stratified water  Anoxic environment  Mathematical modeling
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