- 责任者：Fu Guang (Geoscience College ; Northeast Petroleum University ; Daqing 163318 ; China) ; Yang Jingbo
- 刊名：Earth Science
- 出版年：2013
- 卷期：38(4)
- 页码：p.783-791
- issnNo：ISSN1000-2383
- isbnNo：CN42-1233/P
To study oil-gas accumulation law of middle and shallow strata in Nanpu depression, sealing of matching between fault and eaprock to oil-gas migrating through faults was studied by the method contrasting between thickness of eaprock and fault distance and analyzing the relation between it and oil-gas distribution. The results indicate that there are three grades seal- ing of regional eaproek to oil-gas migration through faults： （1） when thickness of caprock is bigger than fault distance and fau[- ted thickness of caprock is bigger than a fixed value, matching between fault and caprock can seal fully oil-gas migration through faults; （2） when thickness of caprock is less than fault distance and faulted thickness of caprock is less than a fixed value, matching between fault and caprock can partially seal oil-gas migration through faults; （3） when thickness of eaprock is less than fault distance and faulted thickness of regional caprock is less than zero, matching between fault and caprock can not seal oil-gas migration through faults. Matching between faults and regional caprock of Ed2 and Nga both have a full, partial and no sealing to oil-gas migration through faults, and matching between faults and regional caprock of Nm~ has full sealing to oil- gas migration through faults in Nanpu depression. Controlling of relation of matching among sealing of matching between fault and three regional caprock to oil-gas migrating through faults to oil-gas accumulation horizons and areas is shown in following three aspects： （1） matching between faults and regional caprock of Ed2 in Nanpu2 region has full sealing, oil-gas distributes under it; （2） Matching between faults and regional caprock of Ed2 in Nanpu 1-5 block has partial or no sealing, but matchingbetween faults and regional caprock of N,g3 has full sealing, oil-gas distributes mainl in Ed3 and Ng4 ; （3） Matching between faults and regional caprock of Ed2 and Ng3 in the part of Nanpul and Nanpu4 structures have partial or no sealing, but matching between faults and regional caprock of Nml has full sealing, oil-gas distributes from lower to upper.