东濮凹陷文留地区古近系超压成因分析  

Eogene overpressure origin analysis in VVenliu area of Dongpu Depression

作　　者：唐小云[1] 龚晶晶[1] 杨世刚[2] 曾治平[3] 

机构地区：[1]中国石油冀东油田分公司勘探开发研究院,河北唐山063004 [2]中国石化股份中原油田分公司油藏监测中心,河南濮阳457000 [3]中国石化股份胜利油田分公司河口采油厂,山东东营257200

出　　处：《油气地质与采收率》2007年第5期20-22,共3页Petroleum Geology and Recovery Efficiency

摘　　要：东濮凹陷是一个受区域性应力拉张作用所形成的盐湖断陷盆地,文留构造位于该凹陷中央隆起带,构造内普遍发育超压。运用地球物理和地球化学资料,从压实不均衡、生烃作用以及盐岩封闭等方面分析了该区的超压成因。研究结果表明,文留地区地层为正常压实状态,不存在明显或可识别的欠压实沉积过程,超压顶面与生烃门限相吻合,地层压力在巨厚的盐岩封闭层下完好保存,在深度剖面上表现为一种台阶式递进序列。生烃作用是文留地区超压发育的主要原因,盐岩封闭为超压的保存提供了良好条件,压实不均衡作用对文留地区古近系的超压贡献不明显。Dongpu Depression is a saline downfaulted basin caused by regional stress extension. Wenliu structure lies in the centre uplift zone of the Dongpu Depression, and overpressure develops widely in it. Overpressure mechanism is researched from the aspects of compaction disequilibrium, hydrocarbon generation and rock salt sealing according to the geophysical and geochemical data. The research suggests that the strata of Wenliu are normal compaction , and there is not obviously or recognizablely undercompacted sedimentary process. The top of the overpressure formation coincides with the depth of hydrocarbon generation threshold, the formation pressure has been conserved very well because of the thick saline sealing,and it shows a step increasing sequence as the depth increasing. Hydrocarbon generation was the main factor causing the overpressure development, saline sealing offered the approved condition for the overpressure keeping,and the effect of compaction disequilibrium was not marked to the overpressure in Eogene.

关 键 词：超压 压实不均衡 生烃作用 盐岩封闭 东濮凹陷 

分 类 号：TE112[石油与天然气工程—油气勘探]