渤海湾盆地新生界生油岩系底界面温度分布  

Distribution of temperature at the bottoms of Cenozoic source rocks in the Bohai Bay Basin

作　　者：龚育龄[1] 王良书[2] 刘绍文[3] 李成[2] 韩用兵[2] 李华[2] 蔡进功[4] 

机构地区：[1]东华理工大学探测与信息技术系,江西抚州344000 [2]南京大学地球科学系,南京210093 [3]南京大学地理与海洋科学学院,南京210093 [4]同济大学海洋与地球科学学院,上海200092

出　　处：《地质科学》2008年第1期1-11,共11页Chinese Journal of Geology(Scientia Geologica Sinica)

基　　金：国家基础研究发展规划项目(编号:G1999043302);胜利油田科技攻关项目联合资助

摘　　要：依据渤海湾盆地2000余口测温井的地温梯度数据、地层岩性描述、分层数据以及钻井资料,计算了该盆地各生油岩系底界面的温度。统计结果表明:渤海湾盆地沙河街组大部分凹陷区地层底界面温度介于90℃至150℃,目前仍具有大量生油的温度条件,而在隆起或一些凸起地区,该地层组段温度普遍小于90℃,未能达到生油的温度指标。东营组和孔店组地层也仍具有一定的生油温度条件。研究还表明:地层温度与地层界面埋深密切相关,温度随界面埋深的增大而升高,沉积厚度大的凹陷区地层界面温度大于沉积厚度小的凸起区或斜坡地带,说明地层界面埋深是决定地温高低的主要控制因素,而地温梯度对地层界面温度的影响相对较小。Based on the geotemperature data from more than 2 000 wells in the Bohai Bay Basin,stratigraphical and lithological descriptions, and stratification and well logging data, the paper calculated the temperature at the bottom surfaces of different Cenozoic source rocks in the basin. The results showed that the temperature at the bottom of the Shahejie Formation in most sags of the basin ranged from 90 ℃ to 150 ℃ , satisfying the condition for oil generation, while it was less than 90 ℃ for the same formation in areas of uplifts or some highs, which was not enough for oil generation. The Dongying and Kongdian Formations might be possible for oil generation in temperature to some extent. It was also found that the temperature showed a close relationship with the buried depth of the strata, namely, the temperature increased with the increasing buried depth. The sags where the sediments were relatively thicker had a larger temperature than that in the uplifts and highs with relatively thinner sediments, indicating that the depth of the formation should be a key factor for controlling its temperature, and the influence of the geotemperature gradient might be relatively small.

关 键 词：地温梯度 地层底界面 油气液态窗 生油岩系 新生界 渤海湾盆地 

分 类 号：P314.3[天文地球—固体地球物理学]