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中南大学学报(自然科学版)

Journal of Central South University

第42卷    第5期    总第201期    2011年5月

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文章编号:1672-7207(2011)05-1384-09
哥伦比亚Velasquez油田始新统Guaduas组
沉积微相与剩余油分布
赵彬1, 2,侯加根1,张国一1,陈诗望3,刘钰铭1

(1. 中国石油大学 地球科学学院,北京,102249;
2. 长江大学 地球物理与石油资源学院,湖北 荆州,434023;
3. 中国石油化工股份有限公司 石油勘探开发研究院,北京,100083
)

摘 要: 为了查明Velasquez油田剩余油分布,挖掘剩余油潜力,对研究区的沉积环境、沉积微相及其特征进行研究,建立准确的储集层模型。根据岩芯观察,对构造特征、岩性特征、粒度特征和地震响应特征进行分析。利用均方根振幅属性预测砂体厚度,并以此对沉积微相展布进行分析,讨论沉积微相与剩余油分布的关系。研究结果表明:48-45断块区Guaduas组为一套辫状河三角洲沉积,并划分为辫状河三角洲平原、前缘2个亚相和辫状河道、泛滥平原、水下分流河道、河口坝、席状砂、支流间湾6个微相; Guaduas组沉积时期经历了湖平面升—降—升的演化;研究区油层水淹程度和剩余油分布明显受沉积微相制约,辫状河道和水下分流河道顶部、河口坝侧缘、席状砂砂体沉积区剩余油相对富集,是油田下一步开发调整和剩余油挖潜的主体。

 

关键字: Velasquez油田;Guaduas组;沉积微相;辫状河三角洲;剩余油分布

Sedimentary microfacies and remaining oil distribution of the Eocene Guaduas formation in Velasquez Oilfield, Columbia
ZHAO Bin1, 2, HOU Jia-gen1, ZHANG Guo-yi1, CHEN Shi-wang3, LIU Yu-ming1

1. School of Geosciences, China University of Petroleum, Beijing 102249, China;
2. School of Geophysics and Oil Resources, Yangtze University, Jingzhou 434023, China;
3. Institute of Pereolum Exportation and Production, Sinopec, Beijing 100083, China

Abstract:To get a proper knowledge of remaining oil distribution and improving oil recovery rate in Velasquez oilfield, the core observation, depositional structure, lithologic, granularity and seismic response characteristics were analyzed. The sedimentary condition, sedimentary micro-facies and their features were studied, and the model of proper reservoir was built. The predict sandbodies’ thickness was predicted using the root-mean-square amplitude, and through it the micro-facies distribution was discussed. The relationship between microfacies and remaining oil distribution was discussed. The results show that the depositional environment of the Guaduas formation in 48-45 fault block belongs to braid delta deposit. The depositional facies include two subfacies (braided river delta plain and braided river delta front) and six micro-facies (braided channel, flood plain, subaqueous distributary channel, mouth bar, sheet sand and interdistributory bay). The lake level has rise-fall-rise during Guaduas formation sedimentary period. Reservoir water flooding degree and remaining oil distribution are controlled by micro-facies. And the remanent oil is relatively concentrated in the top of braided channel and subaqueous distributary channel, the side of mouth bar and sheet sand, which are the major targets of next development adjustment and remaining oil potential tapping.

 

Key words: Velasquez oilfield; Guaduas formation; sedimentary micro-facies; braided river delta; remaining oil distribution

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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