摘要
根据8口井的系统测温资料和142口井的油层测温资料,计算并绘制了渤海盆地的地温梯度分布图.渤海盆地新生代盖层的平均地温梯度为3.3℃/100m,其中凹陷区地温梯度为2.5～3.5℃/100m,凸起区地温梯度为3.0～4.5℃/100m.地温梯度分布与盆地成因和断裂构造的关系十分密切.研究结果表明,渤海盆地高地温梯度带对应于地壳减薄带、岩石圈伸展带和深部断裂带.此外,还计算了特征深度和部分烃源岩层底界面上的温度,并绘制了相应的地温分布等值线图.烃源岩现今温度的高低主要与其埋深相关.渤海盆地现今"液态窗”的深度范围一般为2000～4500m,而在辽东湾地区其下限接近5000m.
Using temperature data measured from whole hole in 8 wells and oil intervals in 142 wells,the geotemperature gradient in Bohai Sea is calculated and contoured.An average gradient for Cenozonic cover is 3 3℃/100m,with 2.5 to 3.5℃/100m in sags and 3.0 to 4.5℃/100m in uplifts.The distribution of geotemperature gradient is closely related to basin origin and fault structures.This study shows that the zones with higher geotemperature gradient in Bohai Sea are in accordance with crust thinning,lithosphere stretching and deep faulting belts.Moreover,temperatures for special horizons and some source bases are calculated and contoured respectively,indicating that present temperature of source rocks depends mainly on their depth.In Bohai Sea,the today′s“liquid hydrocarbon window” is 2000 to 4500 meter in depth,with the maximum depth near 5000 meter in Liaodongwan area.
出处
《中国海上油气（地质）》
2001年第2期105-110,共6页
China Offshore Oil and Gas(Geology)
基金
渤海石油公司资助项目
