地球物理学进展 ›› 2021, Vol. 36 ›› Issue (3): 1088-1094.doi: 10.6038/pg2021EE0242

• 应用地球物理学Ⅰ(油气及金属矿产地球物理勘探) • 上一篇    下一篇

低饱和度油藏油水层解释方法——以新肇油田古628区块葡萄花油层为例

李雪英1,2(), 万乔升1, 王福霖1, 何谞超3   

  1. 1.东北石油大学地球科学学院,大庆 163318
    2.黑龙江省油气藏形成机理与资源评价重点实验室,大庆 163318
    3.大庆油田有限责任公司第七采油厂,大庆 163517
  • 收稿日期:2020-09-22 修回日期:2021-01-10 出版日期:2021-06-20 发布日期:2021-07-01
  • 作者简介:李雪英,男,1972年生,博士,教授,2009年毕业于中国科学院地质与地球物理研究所固体地球物理专业,现主要从事地震波传播与成像方面的研究工作.E-mail: lxy8403@sina.com.cn

Interpretation method of oil-water layer in low oil-saturation reservoirs: a case study in Putaohua reservoirs in Gu628 Block of Xinzhao Oilfield

LI XueYing1,2(), WAN QiaoSheng1, WANG FuLin1, HE XuChao3   

  1. 1. College of Earth Science, Northeast Petroleum University, Daqing 163318, China
    2. Heilongjiang Oil and Gas Reservoir Forming Mechanism and Resource Evaluation Key Laboratory(Northeast Petroleum University), Daqing 163318, China
    3. No.7 Oil Production Company, Daqing Oilfield Company Limited, Daqing 163517, China
  • Received:2020-09-22 Revised:2021-01-10 Online:2021-06-20 Published:2021-07-01

摘要:

新肇油田古628区块葡萄花油层为低饱和度油藏.由于该类油藏含油饱和度低,导致油层电性特征不明显,与油水同层、水层区分度不高;钙质、泥质愈使电性特征复杂化,流体识别难度大.针对上述油水层判别技术难题,本文依据孔隙结构指数及自然伽玛相对值划分储层类型;依据电阻率泥质、钙质校正公式,消除泥质、钙质对电阻率的影响;将薄差层与厚层相剥离单独研究,采用深侧向与深感应电阻率比值与自然电位交会判别薄层油水层;在储层分类及电阻率校正基础上,优选深侧向电阻率与自然电位曲线交会判别厚层油水层.研究表明:分类、分层厚判别方法可较好地解决低饱和度油藏油水识别问题,图版精度均达到90%以上;经新投产井进行背对背验证,解释符合率为85.5%.

关键词: 新肇油田, 葡萄花油层, 低饱和度油藏, 油水层解释, 储层分类, 电阻率校正

Abstract:

Putaohua reservoirs in Gu628 block of Xinzhao Oilfield are the low oil-saturation reservoir. Due to the low oil saturation, the electrical characteristics of this kind of reservoir are not obvious, and the oil layer is not easy distinguished from the oil-water layer and water layer.
Moreover, the calcareous and shale contents make electrical characteristics complicated and difficult to identify fluid properties. In view of the above technical difficulties in oil-water layer discrimination, the reservoir types are first classified according to the pore structure index and the relative value of the natural gamma. And then, according to the calcareous and shale correction formula of resistivity, the influences of calcareous and shale contents on the resistivity curve are eliminated. Therefore, separated the thin poor layer from thick layer, the cross-plot of spontaneous potential and ratio of deep lateral resistivity to deep induced resistivity is used to identify thin oil-water layers. On the basis of reservoir classification and resistivity correction, deep lateral resistivity and spontaneous potential curve are optimized to identify thick oil-water layer. The results show that the classification and thick-division method can solve the problem of oil and water identification in low oil-saturation reservoirs. The accuracies of these interpretation charts are more than 90% and the interpretation coincidence rate is 85.5% after the back-to-back verification with the new production wells.

Key words: Xinzhao Oilfield, Putaohua reservoirs, Low oil-saturation reservoir, Oil-water layer interpretation, Reservoir classification, Resistivity correction

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