地层水矿化度对补偿中子测井影响的自动校正方法研究

doi:10.11720/wtyht.2019.0012

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摘要

在以往补偿中子测井的蒙特卡罗模拟研究中,地层水矿化度多设置为0,但实际上地层水矿化度变化会对补偿中子测井造成影响。对此文中利用蒙特卡罗方法模拟研究了地层水矿化度对补偿中子测井的影响并提出其校正方法。先后模拟计算了不同孔隙度条件下,矿化度与计数率、计数比的关系以及矿化度对计数比与孔隙度的关系和孔隙度灵敏度的影响。结果表明,在相同孔隙度条件下,探测器计数率随矿化度增加而降低,远探测器计数率降低速率大于近探测器;近远计数比随矿化度增加呈二次函数线性增加;基于大量模拟数据,建立了适用于不同地层水矿化度条件下孔隙度与矿化度的双变量函数关系式,消除了地层水矿化度对补偿中子测井的影响。此外,孔隙度灵敏度在中、低孔隙度地层受矿化度影响明显。文中建立的孔隙度与矿化度的双变量函数关系式,完成了地层水矿化度效应的自动校正,简化了与地层水矿化度效应相关的后续校正工作,避免了复杂的仪器重新刻度,为准确评价储层孔隙度提供了理论依据。

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	李鹏举
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关键词 ：地层水矿化度, 补偿中子测井, 计数比, 蒙特卡罗模拟, 双变量函数

Abstract：

In the previous Monte Carlo numerical simulation of compensated neutron logging, formation water salinity was mostly set at 0, but in fact, the alteration of formation water salinity would affect compensated neutron logging. In this paper, Monte Carlo method was used to simulate the influence of formation water salinity on compensated neutron logging, and its correction method was proposed. The relationship between salinity and counting rate, salinity and counting ratio, and the effect of salinity on the relationship between counting ratio and porosity and porosity sensitivity under different porosity conditions were simulated successively. According to the calculated results, under the same porosity condition, the counting rate decreases with the increase of salinity, and the counting rate of far detector decreases faster than that of near detector; the near-far counting ratio increases linearly with the increase of salinity as a quadratic function; based on a large number of simulation data, a bivariate function relationship between porosity and salinity is established for different formation water salinity conditions, which eliminates the influence of formation water salinity on compensated neutron logging. In addition, the sensitivity of porosity is obviously affected by salinity in medium and low porosity formations. The bivariate function relation between porosity and salinity established in this paper has completed the automatic correction of salinity effect, simplified the subsequent correction work related to formation water salinity effect, avoided complex instrument re-calibration, and provided a theoretical basis for accurate evaluation of reservoir porosity.

Key words： formation water salinity compensated neutron logging count ratio Monte Carlo simulation bivariate function

收稿日期: 2019-01-07 出版日期: 2019-08-15

P631

基金资助:国家科技重大专项课题“海上油田化学驱油技术”子课题“海上油田化学驱综合调整技术研究”(2016ZX05025-003-005);国家自然科学基金项目“骨架导电低阻油层人造岩样实验及导电规律与导电模型研究”(41274110);“致密砂岩储层纳微米孔隙有效下限研究”(41572132)

作者简介: 李鹏举(1970-),男,教授,博士,主要从事地球物理资料处理解释教学和研究工作。Email: 13936900420@126.com

引用本文:

李鹏举, 李勇勇, 徐茂河, 付勇路, 田甜. 地层水矿化度对补偿中子测井影响的自动校正方法研究[J]. 物探与化探, 2019, 43(4): 815-821.
Peng-Ju LI, Yong-Yong LI, Mao-He XU, Yong-Lu FU, Tian TIAN. A study of automatic correction method for the influence of formation water salinity on compensating neutron logging. Geophysical and Geochemical Exploration, 2019, 43(4): 815-821.

链接本文:

https://www.wutanyuhuatan.com/CN/10.11720/wtyht.2019.0012 或 https://www.wutanyuhuatan.com/CN/Y2019/V43/I4/815

Fig.1 补偿中子测井蒙特卡罗数值模拟计算模型

Fig.2 ²⁴¹Am-Be中子源能谱分布

Fig.3 计数率与孔隙度的关系曲线
a—近探测器;b—远探测器

Fig.4 地层水矿化度与计数比的关系

Fig.5 近远探测器计数率比值与孔隙度关系

Table 1 不同矿化度、孔隙度地层的近远探测器计数率比值

Fig.6 视孔隙度与真孔隙度对比
a—式(1)计算的视孔隙度与真孔隙度;b—式(2)计算的视孔隙度与真孔隙度

Fig.7 式(2)的孔隙度与灵敏度及相对灵敏度的关系
a—灵敏度;b—相对灵敏度

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