摘要
目的为了客观评价东濮凹陷孟岗集洼陷生烃潜力。方法综合运用有机岩石学、热解分析及有机地球化学等方法,依据洼陷内21口探井的资料,对古近系沙河街组沙一段(Es1)和沙三段(Es3)烃源岩有机质丰度、类型、成熟度和热演化史进行了分析,并进行了油源对比。结果孟岗集洼陷北部Es1烃源岩属较中—差烃源岩,Es3下部烃源岩属较中—好烃源岩,Es3上部属差—非烃源岩,洼陷南部皆为非烃源岩;有机质类型Es1为Ⅰ,Ⅱ1型,Es3为Ⅱ1,Ⅱ2型;Es1热演化程度低,为低成熟型烃源岩,沙三1-2亚段(Es31-2)为成熟烃源岩,沙三3-4亚段(Es33-4)为高成熟烃源岩,濮深8井原油来自Es33-4的高成熟泥岩。结论Es33-4为孟岗集洼陷的主力生烃层系,孟岗集洼陷北部是找油气远景区。
Aim For the purpose of evaluation of the hydrocarbon generation potential in Menggangji Sag,Dongpu Depression. Methods On the basis of analysis about the abundance and the types of Paleogene（ Es1, Es3 ） organic matters of 21 wells in Menggangji Sag, Dongpu Depression, and research about the source rock＇s maturity and the thermal evolution history, evaluate the hydrocarbon generation potential of the source rocks by means of organic petrology,rock-evel, geochemistry, oil-source correlateion. Results Es1 source rocks are middling-relatively bad; lower part of Es3 source rocks in north of Menggangji Sag are middling-relatively better,and the upper parts are relatively bad or non-source rocks ; otherwise, there are non-source rocks in south. There are two types of organic matters in Es1 source rocks（ I ,Ⅱ1）,and Es3 is mainly Ⅱ1,Ⅱ2 ;Most of Es1 source rocks axe in the lower-maturity stage, the upper part of Es3 is in maturity stage, the lower in relatively high-maturity stage. It is found that the well pushen 8 crude oil should be formed of organic matter from lower part of Es3. Conclusion It is concluded that the best source rocks are thought as the lower part of Es3 ,the north of Menggangji Sag is the prospective areas for further hydrocarbon exploration.
出处
《西北大学学报（自然科学版）》
CAS
CSCD
北大核心
2006年第4期623-627,共5页
Journal of Northwest University（Natural Science Edition）
基金
国家重点基础发展计划基金资助项目(2002CCC01400)
关键词
油源对比
烃源岩
古近系
孟岗集洼陷
东濮凹陷
Oil source correlation
hydrocarbon source rock
Paleogene system
Menggangji Sag
Dongpu Depression
