油气藏评价与开发 ›› 2018, Vol. 8 ›› Issue (6): 1-6.

• 油气地质 •    下一篇

低孔低渗储层有效厚度确定方法研究——以安塞油田长2储层为例

王霞1,2,付国民1,郭爱华3,王超3,孙晓4,靳星2   

  1. 1. 长安大学地球科学与资源学院,陕西 西安 710064
    2. 延安大学石油工程与环境工程学院,陕西 延安 716000
    3. 延长油田股份有限公司杏子川采油厂,陕西 延安 717400
    4. 陕西延长石油(集团)有限责任公司研究院,陕西 西安 710000
  • 收稿日期:2018-02-07 出版日期:2018-12-26 发布日期:2018-12-13
  • 作者简介:王霞(1982—),女,讲师,在读博士研究生,石油地质学研究。
  • 基金资助:
    国家自然科学基金“陆相页岩岩性非均质性及其对油气滞留的影响”(41702136);延安市科技创新团队项目“油气资源开发与环境保护科技创新团队”(2015CHTD-04);延安大学2017年科研计划项目“鄂尔多斯盆地吴起地区延长组下组合优质储层控制因素及分布预测研究”(YDQ2017-22)

Research on determination of effective thickness for oil reservoirs with low permeability: A case of Chang-2 reservoir of Ansai oilfield

Wang Xia1,2,Fu Guomin1,Guo Aihua3,Wang Chao3,Sun Xiao4,Jin Xing2   

  1. 1. School of Earth Science and Resources, Chang'an University, Xi'an, Shaanxi 710064, China
    2. School of Petroleum Engineering and Environmental Engineering, Yan'an University, Yan'an, Shaanxi 716000, China
    3. Xingzichuan Oil Production Plant, Yanchang Oilfield Corporation, Yan'an, Shaanxi 717400, China
    4. Research Institute of Shaanxi Yanchang Petroleum(Group) Co., Ltd., Xi'an, Shaanxi 710000, China)
  • Received:2018-02-07 Online:2018-12-26 Published:2018-12-13

摘要:

针对安塞油田长2储层低孔、低渗、物性变化快、纵横向非均质性强的地质特点,综合应用目的层段的岩心分析、试油、生产动态及测井等资料,在储层四性关系研究基础上,采用直方图法和交会图法确立了有效厚度下限标准,采用多种测井曲线半定量、半定性分析结合的方式,建立了不同类型夹层测井定量识别图及夹层扣除标准。研究区长2储层有效厚度含油性下限为油迹级,岩性下限为细砂岩,物性下限为孔隙度11.5 %、渗透率0.63×10 -3μm 2,电性下限为RILD≥13 Ω·m、Δt≥230 μs/m;夹层类型主要为泥质夹层和钙质夹层,利用自然伽马、声波时差、井径和微梯度等曲线的定量和自然电位、深感应电阻率、中感应电阻率、微球电阻率及微电位等曲线的定性可以识别和扣除夹层。

关键词: 低渗储层, 有效厚度, 下限标准, 夹层扣除, 安塞油田

Abstract:

The Chang-2 reservoir of Ansai oilfield has the geological characteristics of low porosity, low permeability, fast change of physical properties and strong vertical and horizontal heterogeneity. Based on the ''four properties'' relation of reservoir, we established the minimum standards of effective thickness by using the core analysis, oil test, production dynamics and logging by the way of histogram method and cross plot method. Then we proposed the different types of interlayer logging quantitative identification chart and the elimination criterion of various interlayer on the basis of the semi-quantification and semi-qualitative analysis by many kinds of logging curves. The minimum values were as follows: the oil-bearing property was to see the grease spots; the lithological property was to see the fine-grained sandstone; the physical property were the porosity was more than or equaled to 11.5 % and the permeability was more than or equaled to 0.63×10 -3μm 2; the electrical property were the resistivity was more than or equaled to 13 Ω·m and the acoustic was more than or equaled to 230 μs/m. The main types of interlayer were calcareous interlayer and muddy interlayer. We could identify and eliminate the interlayer by the quantification of curves of natural gamma, acoustic and microelectrode, and the qualitative analysis of the curves of spontaneous potential, RILD, RILM, microsphere resistivity and micronormal.

Key words: low permeability reservoir, effective thickness, cutoff standards, interlayer elimination, Ansai oilfield

中图分类号: 

  • TE122