PNN测井清污混注水淹层剩余油饱和度计算方法

doi:10.11720/wtyht.2021.1082

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Abstract

Pulsed neutron-neutron (PNN) logging technology through casing can identify fluid properties by measuring the number of thermal neutrons not captured by formation.It solves the problems of unclear response of electrical logging in watered-out zone and the influence of gamma background on neutron lifetime logging.In this paper,an adaptive genetic algorithm was utilized to eliminate the influence of non-geological factors and obtain the optimum solution of PNN interpretation parameters by setting the probability of selection,crossover and mutation and selecting the initial population in the standard layer.In view of the great change of salinity of mixed formation water due to interval injection by fresh water and sewage,the authors propose a variable parameter PNN interpretation method for calculating the macroscopic capture cross section of mixed formation water in small layers,so as to accurately identify the flooded layer and greatly improve the calculation accuracy of residual oil saturation.

Key words： PNN well logging water flooded layer residual oil saturation adaptive genetic algorithm

Received: 24 February 2020 Published: 27 July 2021

ZTFLH:

P631.8

Corresponding Authors: SHAN Sha-Sha

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	Xue-Juan ZHU
	Sha-Sha SHAN
	Zi-Yuan YIN
	Xue KONG

Cite this article:

Xue-Juan ZHU,Sha-Sha SHAN,Zi-Yuan YIN, et al. The calculation method of residual oil saturation by PNN logging in water flooded interval injected by fresh water and sewage[J]. Geophysical and Geochemical Exploration, 2021, 45(3): 679-685.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2021.1082 OR https://www.wutanyuhuatan.com/EN/Y2021/V45/I3/679

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