松辽盆地白垩纪湖泊水体温度与古气候温度估算  

Estimation of the Ancient Lake Temperature and Paleo-Climate of the Cretaceous Period in the Songliao Basin

作　　者：申家年[1] 王庆红[1] 何江林[2] 卢双舫[1] 

机构地区：[1]大庆石油学院地球科学学院,黑龙江大庆163318 [2]中国地质调查局成都地质矿产研究所,成都610082

出　　处：《吉林大学学报（地球科学版）》2008年第6期946-952,共7页Journal of Jilin University：Earth Science Edition

基　　金：教育部新世纪优秀人才支持计划项目(NCET-04-0345);中国石油风险基金(2005-01-02);中国石油天然气集团公司“十一·五”科技攻关项目

摘　　要：湖泊沉积物沉积的第一场所是湖底，湖底温度的高低影响沉积有机质的保存，也影响湖底下部地层的温度。了解古水体温度尤其是古水底温度情况成为评估松辽盆地白垩系生物气勘探前景的必要研究内容之一。根据已有的古气候研究成果与现今气候对比，得出白垩纪松辽盆地年平均气温约为14～24℃。再根据水库温度的计算方法和利用已有的古纬度及古水深的研究成果计算得出，白垩纪松辽盆地古湖盆水体表面温度为17～25℃；水深大于20m的深湖区，水底温度为6．2～12．5℃；湖底最深处温度为4．0～11．3℃；青山口组和嫩江组沉积时期，湖水分层明显，湖底温度季节性变化很小且温度较低，约为8℃。湖底的低温对松辽盆地白垩纪生物气勘探是有利的。The first location of the lake sediment deposition is at the lake bottom, so the temperature of the lake bottom not only has influence on the preservation of organic matter, but also has influence on the formation temperature under the lake bottom. The ancient water body temperature, especially the temperature of the lake bottom becomes a key aspect in estimating the exploration prospect. According to the comparison between the previous research result of the paleo-climate and the nowadays climate, the average annual temperature during the Cretaceous period of the Songliao Basin is between 14 ℃ and 24 ℃. Using the reservoir temperature calculation method, and the data on the palaeolatitude and the paleo-water depth, the palaeo-temperature of the lake surface of the Songliao Basin is between 17 ℃ and 25 ℃ ; the temperature of the bottom water is between 6.2 ℃ and 12.5℃ in the deep lake; the temperature of the deepest lake bottom is between 4.0℃ and 11.3℃. During the period of the Qingshankou Group and Nenjiang Group deposition, the temperature of the lake bottom did not change much with the seasons, and the temperature was low （about 8℃）,and the stratification was clear. Therefore, the lower temperature at the lake bottom is favor of the Cretaceous biogas exploration in the Songliao Basin.

关 键 词：松辽盆地 白垩纪 古气温 湖底温度 生物气 

分 类 号：P618.13[天文地球—矿床学]