石油学报 ›› 2019, Vol. 40 ›› Issue (s1): 206-216.DOI: 10.7623/syxb2019S1018

• 油田开发 • 上一篇    下一篇

基于动态资料的低孔低渗砂岩储层渗透率测井评价方法——以陆丰凹陷古近系为例

王清辉, 冯进, 管耀, 石磊, 潘卫国, 周开金, 杨清, 宋伟   

  1. 中海石油(中国)有限公司深圳分公司研究院 广东深圳 518067
  • 收稿日期:2018-07-05 修回日期:2018-10-18 出版日期:2019-07-25 发布日期:2019-07-15
  • 通讯作者: 王清辉,男,1986年11月生,2010年获长江大学学士学位,2013年获中国石油大学(北京)硕士学位,现为中海石油(中国)有限公司深圳分公司工程师,主要从事珠江口盆地(东部)地区测井评价研究。Email:wangqh24@cnooc.com.cn
  • 作者简介:王清辉,男,1986年11月生,2010年获长江大学学士学位,2013年获中国石油大学(北京)硕士学位,现为中海石油(中国)有限公司深圳分公司工程师,主要从事珠江口盆地(东部)地区测井评价研究。Email:wangqh24@cnooc.com.cn
  • 基金资助:

    国家科技重大专项"南海东部海域古近系勘探及其关键技术研究"(2016ZX05024-004-004)资助。

Permeability logging evaluation method of low-porosity low-permeability sandstone reservoirs based on dynamic data: a case study of Paleogene strata in Lufeng sag

Wang Qinghui, Feng Jin, Guan Yao, Shi Lei, Pan Weiguo, Zhou Kaijin, Yang Qing, Song Wei   

  1. Research Institute of Shenzhen Branch of CNOOC China Limited, Guangdong Shenzhen 518067, China
  • Received:2018-07-05 Revised:2018-10-18 Online:2019-07-25 Published:2019-07-15

摘要:

复杂孔隙结构导致陆丰凹陷古近系低孔低渗砂岩储层的孔隙度级别相同,但渗透率相差1~2个数量级,常规孔渗模型计算渗透率的精度低,难以满足当前对古近系储层有效性识别和产能预测的需求。通过综合运用岩心物性分析、压汞和核磁共振T2谱,将储层划分为4类流动单元,利用电缆地层测试流度结合孔隙度识别流动单元类型,实现储层绝对渗透率的准确评价。在此基础上,基于岩心相渗实验建立岩心尺度上的绝对渗透率和最大油相渗透率的转换模型,然后利用纯油层取样渗透率和钻杆测试(DST)试井解释渗透率建立岩心尺度到DST试井尺度的渗透率转换模型,最终实现DST测试油相渗透率的计算。运用电缆地层测试流度结合流动单元法对陆丰凹陷5口井古近系地层绝对渗透率进行评价的结果显示,预测渗透率的相对误差平均值为48.3%,精度明显高于Herron模型。采用测井计算的DST尺度油相渗透率对3口井的产能进行预测,结果与实际测试产能吻合较好。

关键词: 陆丰凹陷, 电缆地层测试, 流度, 流动单元, 渗透率转换

Abstract:

The complex pore structure results in the same porosity level in the Paleogene low-porosity low-permeability sandstone reservoirs in Lufeng sag, but the permeability is different by one to two orders of magnitude. The conventional pore-permeability model has low accuracy for calculating permeability, which is difficult to satisfy the current demand for validity identification and productivity forecast of Paleogene reservoir. Based on the physical property analysis, mercury intrusion and nuclear magnetic T2 spectrum of rock cores, this study divides the reservoir into four types of flow units. The wireline formation test was used to measure fluidity. In combination with porosity, the types of flow units were identified, thus achieving an accurate evaluation of reservoir absolute permeability. On this basis, a conversion model of absolute permeability and maximum oil phase permeability was established by the core permeability experiment. Then, pure oil-layer sampling permeability and DST interpretation permeability were applied to create the permeability conversion model from core scale to DST well test scale, and finally calculated out the DST tested oil-phase permeability. The permeability of five wells in Paleogene strata of Lufeng sag was evaluated using wireline formation test for fluidity and flow element method. The results show that the average relative error of the predicted permeability is 48.3%, and the accuracy is significantly higher as compared with Herron model. In addition, the DST scale oil-phase permeability calculated by logging is used to predict the yields of three wells. The results are better consistent with the actual test yields.

Key words: Lufeng sag, wireline formation test, fluidity, flow unit, permeability conversion

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