关键词: 古物源, 沉积相, 成岩作用, 储层特征, 古近系, 黄河口凹陷, 渤海海域

Abstract: The provenance of Paleogene is complex in the northern steep slope zone of Huanghekou Sag,and the reservoir physical properties are quite different. The data of cores,thin section,logging,3-D seismic and physical properties were used to reveal the provenance of Paleogene,and the controlling effect of the paleo-prov-enance on high-quality reservoir was discussed. The results show that:(1)Paleo-gullies were commonly developed in the study area. During the sedimentary period from the Es to Ed,the lithology and area of the parent rock changed significantly,and the area of the provenance experienced the evolution process of "large-smalllarge".(2)The denudation stage of the paleo-provenance had obvious control effect on the sand body. In the longitudinal direction,in Es3,the range of the provenance was large. In the provenance,a large number of Mesozoic clastic rocks participated in the source,and the sedimentary area formed a thin layer of glutenite with a small thickness. In Es 2,the provenance was large. The source was mainly volcanic rock erosion. The sedimentary area formed thick glutenite with a large thickness. In Es1,a rapid lake invasion occurred. The range of the provenance was reduced. The thin layer of glutenite formed in the sedimentary zone had a small thickness. In Ed3,a lake retreat occurred. The area of the provenance expanded. There were a large number of mudstones formed in Es1 to participate in the supply. The sedimentary area formed a thin layer of glutenite with a small thickness. On the plane, during the same deposition period,the valley system in the western and eastern section of the eastern part of the provenance was large. The provenance was dominated by volcanic rocks and granite erosion. The glutenite which formed in the sedimentary area was large in thickness and scale. The western section of the eastern part was dominated by carbonate rock erosion,and the glutenite formed in the sedimentary area was small in thickness and scale.(3)The parent rock had obvious control effected on reservoir physical properties. From Es3 to Ed3,the eastern section of the eastern part was dominated by volcanic rock erosion,and the buried depth was shallow. The reservoir contained a large number of volcanic rock cuttings,which were easy to dissolve in the later stage,and were weak in cementation and good in reservoir properties. The western section of the eastern part was mainly characterized by carbonate rock erosion and shallow depth,but the cementation was strong and the physical properties were poor. The burial was deep in the west,the compaction and cementation were strong,and the reservoir properties were poor. Therefore,in the similar depth section,when the carbonate parent rock was supplied,the reservoir in the sedimentary area contained a large amount of carbonate gravel and cuttings,and the interstitial material was mainly calcareous cement,with strong cementation and poor physical properties. When volcanic rocks and metamorphic granites were supplied,the reservoir in the sedimentary area was mainly volcanic rocks or granite gravel and cuttings. The content of calcareous cement was less,the cementation was relatively weak,and the reservoir properties were better overall. This result can provide reference for further exploration and evaluation in the study area.

Key words: paleo-provenance, sedimentary facies, diagenesis, reservoir characteristics, Paleogene, Huanghekou Sag, Bohai Sea