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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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

Received: 07 January 2019 Published: 15 August 2019

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	Articles by authors
	Peng-Ju LI
	Yong-Yong LI
	Mao-He XU
	Yong-Lu FU
	Tian TIAN

Cite this article:

Peng-Ju LI,Yong-Yong LI,Mao-He XU, et al. A study of automatic correction method for the influence of formation water salinity on compensating neutron logging[J]. Geophysical and Geochemical Exploration, 2019, 43(4): 815-821.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2019.0012 OR https://www.wutanyuhuatan.com/EN/Y2019/V43/I4/815

Monte carlo numerical simulation model of compensated neutron logging

Distribution of neutron source energy spectrum of ²⁴¹Am-Be

The relationship between counting rate and porosity
a—near detector;b—far detector

The relationship between salinity formation water and counting ratio
a—φ=5%;b—φ=15%;c—φ=25%;d—φ=35%

The relationship between the ratio of near-to-far detector counting rate and porosity

Near-to-far detector counting ratio for different salinity and porosity formations

Comparison of apparent porosity and true porosity
a—Equation (1) calculated apparent porosity and true porosity;b—Equation (2) calculated apparent porosity and true porosity

Porosity sensitivity and relative sensitivity of Equation 2
a—porosity sensitivity;b—relative porosity sensitivity

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