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| 塔南凹陷南屯组近岸水下扇沉积特征及有利含油相带分析 |
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苗长盛1,刘招君1,2,方石1,2,张革3,张君龙3,胡菲1,孙晓娟1
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(1.吉林大学 地球科学学院,吉林 长春 130061;2.油页岩实验中心,吉林 长春 130061;3.大庆油田有限责任公司 勘探开发研究院,黑龙江 大庆 163712)
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| 摘要: |
| 综合利用地震、测井、岩心等资料,对塔南凹陷南屯组近岸水下扇的沉积特征、展布、演化及有利含油相带进行研究。结果表明:本区近岸水下扇可识别出3种亚相、4种微相,不同相带间沉积特征差异显著;近岸水下扇集中发育于凹陷东部控盆断裂的下降盘,在多期扇体叠置连片下,形成了东南、东北两套扇裙,其展布、演化具有“南北各自连片,扇裙先盛后衰”的特点,但受控盆断裂幕式活动和东南、东北物源供给差异的影响,东南扇群的发展和消亡均略早于东北扇群;中扇辫状沟道储层物性及含油气性最好,主要发育中低孔储层,但不同位置及埋深储层渗透率差异较大,很难形成大面积连片的优质储层,因此本区近岸水下扇沉积主要发育个体规模相对较小却数量众多的岩性油气藏和构造-岩性复合油气藏。 |
| 关键词: 塔南凹陷 南屯组 近岸水下扇 沉积特征 展布演化特征 有利含油相带 |
| DOI：10.3969/j.issn.1673-5005.2011.01.006 |
| 分类号::TE 121.3; TE 122.2 |
| 文献标识码:A |
| 基金项目:国家科技重大专项课题(2008ZX05018-001-004);吉林大学创新团队建设项目(201004001) |
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| Sedimentary characteristics and favorable oilbearing facies belts analysis of nearshore subaqueous fan of Nantun formation in Tanan depression |
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MIAO Changsheng1, LIU Zhaojun1,2, FANG Shi1,2, ZHANG Ge3, ZHANG Junlong3, HU Fei1, SUN Xiaojuan1
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(1.College of Earth Science, Jilin University, Changchun 130061, China;2.Oil Shale Laboratory Center, Changchun 130061, China;3.Exploration and Development Research Institute, Daqing Oilfield Company Limited, Daqing 163712, China)
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| Abstract: |
| The sedimentary characteristics, distribution, evolution and favorable oilbearing facies belts of nearshore subaqueous fan of Nantun formation in Tanan depression were studied through the integrated utilization of data of seismology, welllogging and core. The results show that three kinds of subfacies and four kinds of microfacies can be identified in nearshore subaqueous fan, and the different facies belts show obvious distinctions in sedimentary characteristics. The development of nearshore subaqueous fan concentrated at the downthrown side of the basin controlling fault in the east part of the depression. The overlaying of multistage nearshore subaqueous fan sediments formed two fan aprons which are characterized by "southeast and northeast each contiguous, flourish at first while decline at last" at the southeast and northeast part of the area. Owning to episodic activities of the basin controlling fault and the distinctions between the sources from southeast and northeast respectively, the southeast fan aprons are a little earlier than the northeast ones in the time of the formation and the decline of the fan aprons. The physical property of braided channels of middle fan subfacies of nearshore subaqueous fan is the best, and the reservoirs with lowmiddle permeability developed. The reservoir porosity of different places and burial depths shows a great discrepancy, therefore it is hard that the reservoirs formed a large joint area and highquality ones. The study area mainly developed lithologic hydrocarbon reservoirs and structurallithologic composite hydrocarbon reservoirs whose individual scale is small but quantities are numerous. |
| Key words: Tanna depression Nantun formation nearshore subaqueous fan sedimentary characteristics characteristics of distribution and evolution favorable oilbearing facies belts |
