Subdivision of Lithofacies Units during Middle-late Stage of Oil Development

SA Li ming; WANG Tian qi; SHI Yong min; LU Ming chun; DU Wen bo

During the middle or late stage of oil-field development, reservoir geological model based on former minilayer division and sedimentary microfacies couldnot meet the demand of regulation tap the latent power and distribution of remaining oil. Thisdemands minilayer division and further finely divideslithofacies. Lithofacies unit is bed or a single bed, formed during transportation and deposition of sediment, which formed under basically sta-ble medium. It represents the smallest lithology unit composed of sediment with identical component. Bedded plane exists between beds, which represents intermittent plane of transient nondeposition or abrupt sedimentation.Lithofacies unit provides sedimentary foundation and new research way for further subdivision and reservoir anisotropy from static view. This paper proves feasibility of lithofacies unit subdivision by studying recent deposits and discusses the principle of finely divided unit, combining close-spaced well to analyze cyclicity, stability of in-terbed, and propose economic technology and oil-producing technology. At last, the paper provides basical method for finely dividing lithofacies unit.

1 Changsha Institute of Geotectonics, Chinese Academy of Sciences, Changsha 410013;

2 Chengdu University of Technology,Chengdu 610059;

3 China University of Geosciences, Beijing 100083;

4 Northwest Branch of Research Institute of Petroleum Exploration and Development,CNPC,Lanzhou 730020;

5 Underground Working Company of Qinghai Petroleum Administration Bureau,Dunhuang,Gansu 735200;

6 Yumen Oil Field,Yumen,Gansu 735200

Received Date: 2002-04-26

Rev Recd Date: 2002-07-30

Key words:

Abstract: During the middle or late stage of oil-field development, reservoir geological model based on former minilayer division and sedimentary microfacies couldnot meet the demand of regulation tap the latent power and distribution of remaining oil. Thisdemands minilayer division and further finely divideslithofacies. Lithofacies unit is bed or a single bed, formed during transportation and deposition of sediment, which formed under basically sta-ble medium. It represents the smallest lithology unit composed of sediment with identical component. Bedded plane exists between beds, which represents intermittent plane of transient nondeposition or abrupt sedimentation.Lithofacies unit provides sedimentary foundation and new research way for further subdivision and reservoir anisotropy from static view. This paper proves feasibility of lithofacies unit subdivision by studying recent deposits and discusses the principle of finely divided unit, combining close-spaced well to analyze cyclicity, stability of in-terbed, and propose economic technology and oil-producing technology. At last, the paper provides basical method for finely dividing lithofacies unit.

HTML

Reference (11)

[1]	吕晓光,于洪文,田东辉等. 高含水后期细分单砂层的地质研究[J]. 新疆石油地质,1993,14(4):345～349[Lu Xiaoguang, Yu Hongwen,Tian Donghui. Geological research of subdividing single sand beds in the late high water content period of oilfield[J].Xinjiang Petroleum Geology,1993,14(4):345～349]
[2]	赵翰卿,付志国,吕晓光等.大型河流--三角洲沉积储层精细描述方法[J]. 石油学报,2000,21(4):109～113[Zhao Hanqing,Fu Zhiguo,Lu Xiaoguang,et al.The technique of reservoir fine description of large river-delta deposition[J].Petroleum Transactions, 2000,21(4):109～113]
[3]	贾爱林,穆龙新,陈亮等. 扇三角洲储层露头精细研究方法[J]. 石油学报,2000,21(4):105～108[Jia Ailin,Mu Longxin,Chen Liang,et al. The fine research method of fan-delta reservoir outcrop[J].Petroleum Transactions, 2000,21(4):105～108]
[4]	窦之林. 储层流动单元研究[M]. 北京:石油工业出版社,2000. 1～7[Dou Zhilin. Flow unit of reservoir researches[M].Beijing: Petroleum Industry Press,2000. 1～7]
[5]	Galloway W E. Clastic depositional system and sequences: applications to reservoir prediction, delineation, and characterization[J]. Leading Edge, 1998,17(2):173～180
[6]	North C P, et al. Ephemeral-fluvial deposits: integrated outcrop and stimulation studies reveal complexity[J]. AAPG Bulletin, 1996,80(6):811～830
[7]	Guangming Ti, et al. Use of flow units as a tool for reservoir description: a case study[J]. SPE Formation Evaluation, 1995.122～128
[8]	Miall A D. Architectural-element analysis: a new method of facies analysis applied to fluvial deposits[J].Earth Sci.Rev.1985,22:261～308
[9]	Miall A D. Reservoir heterogeneities in fluvial sandstone: Lessons from outcrop studies[J].AAPG Bulletin,1988,72(6): 682～697
[10]	Douglas W Jordan and Wayne A Pryor. Hierarchical levels of heterogeneity in a Mississippi river meander and application to reservoir systems[J].AAPG Bulletin,1992,76(10):1 601～1 624
[11]	张昌民.储层研究中的层次分析方法[J].石油与天然气地质,1992,13(3):344～350[Zhang Changmin. Hierarchy analysis in reservoir researches[J]. Oil & Gas Geology, 1992, 13(3):344～350]

Subdivision of Lithofacies Units during Middle-late Stage of Oil Development

Abstract

References

Proportional views

通讯作者: 陈斌, bchen63@163.com

Article Metrics

Proportional views

Related