摘要
综合利用声波时差法和基于镜质体反射率的Easy%Ro模拟法,对苏北盆地金湖凹陷三垛组剥蚀厚度进行了恢复。结果表明,金湖凹陷三垛组较大的剥蚀量及新近系盐城组和第四系东台组沉积地层厚度欠补偿,即"古大于今"的埋藏史是造成该区隆起带和外斜坡区"浅熟"的根本原因。"古大于今"的埋藏史,加上古地温梯度大于现今地温梯度,使得阜宁组烃源岩在三垛组沉积末期达到最大热演化程度并大量生烃。在对三垛组地层剥蚀厚度恢复的基础上,恢复了在三垛组沉积末期的主要输导层的古构造和阜宁组烃源岩的生烃状况,对油气运聚单元进行了划分和评价。
By means of the methods of sonic time difference and Easy%Ro modeling based on vitrinite reflectance,the erosion thickness of Sanduo Formation is reconstructed in Jinhu sag,Subei basin.It is pointed out that the fundamental reason for the 'shallow matured' phenomenon in the uplift zones and outer-slope area is due to the particular geological setting of the ancient burial depths which was greater than the present ones(or called degenerative thermal history).As a result of the ancient burial depth larger than the present,and the paleo-temperature gradient larger than the present,source rock in Funing Formation reached its maximum thermal evolution degree at the end of Sanduo Formation sedimentation period.Based on the reconstruction of erosion thickness of Sanduo Formation,the paleo-structure of main carrier beds and hydrocarbon generation status of Funing source rocks in the end period of sedimentation of Sanduo formation are reconstructed,and petroleum migration and accumulation units are divided and evaluated.
出处
《西南石油大学学报（自然科学版）》
CAS
CSCD
北大核心
2009年第4期13-17,共5页
Journal of Southwest Petroleum University(Science & Technology Edition)
基金
国家"十五"科技攻关项目(2001BA605A09)
关键词
声波时差
剥蚀厚度
埋藏史
热演化史
金湖凹陷
sonic time difference
erosion thickness
burial history
thermal evolution
Jinhu sag
