基于双地层水电阻率的低对比度油层识别方法及应用

doi:10.3969/j.issn.1672-7703.2017.03.012

摘要/Abstract

摘要： 视地层水电阻率（R_wa）是测井解释中的一个重要参数，通常与储层地层水真电阻率（R_w）一起用于识别储层流体性质。然而针对陆相低对比度油藏，由于地层水性质变化较大，同一区域采用同一个R_w 值识别油层，往往得到错误的结论。依据自然电位曲线可以逐层计算储层地层水电阻率（R_{w_sp}），用R_{w_sp} 代替R_w 结合R_wa 进行综合解释，对于陆相油藏中低对比度油层具有较强的识别能力，实际应用效果显著。

关键词: 低对比度油层, 视地层水电阻率, 基于自然电位的地层水电阻率, 自然电位曲线幅度, 束缚水电阻率, 导电离子浓度, 钻井液性质

Abstract: The apparent formation water resistivity (R_wa) is an important parameter of well logging interpretation. It is usually used, together with the true formation water resistivity (R_w), to identify the properties of reservoir fluids. For low-contrast continental reservoirs, however, the properties of formation water vary greatly, thus the wrong conclusion is often reached if the same R_w is used in the same area to identify oil reservoirs. In this paper, the formation water resistivity (R_{w_sp}) was calculated layer by layer on the basis of spontaneous potential curve. Then, R_{w_sp}, as the substitute for R_w, was used for comprehensive interpretation combined with R_wa. This method is quite capable of identifying lowcontrast oil layers in continental reservoirs with remarkable practical results.

Key words: low-contrast reservoir, apparent formation water resistivity, formation water resistivity based on spontaneous potential, amplitude of spontaneous potential curve, irreducible water resistivity, conductive ion concentration, mud property

中图分类号:

P631.322

钟吉彬, 石玉江, 王长胜, 张少华, 李卫兵. 基于双地层水电阻率的低对比度油层识别方法及应用[J]. 中国石油勘探, 2017, 22(3): 96-103.

Zhong Jibin, Shi Yujiang, Wang Changsheng, Zhang Shaohua, Li Weibing. Low-contrast reservoir identification method based on double formation water resistivity and its application[J]. China Petroleum Exploration, 2017, 22(3): 96-103.

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