联合核磁共振测井与Thomeer模型评价碳酸盐岩储层饱和度

doi:10.11720/wtyht.2023.2606

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Abstract

Carbonate reservoirs have various pores and complex pore structures.However,the microstructure of rocks cannot be characterized using conventional saturation evaluation models,making it extremely difficult to perform the saturation evaluation of carbonate reservoirs.Given this,this study proposed a Thomeer saturation model combined with the nuclear magnetic resonance (NMR) logging based on the data of capillary pressure curves and NMR logging.Specifically,information about the structure of the pore system in the mercury injection data was analyzed,and then the capillary pressure curves of multiple pore types were obtained through fitting using the Thomeer function.Finally,the complex pore structure was characterized using multiple Thomeer curves.The NMR logging is the only logging method that can continuously and quantitatively characterize the pore structure of reservoirs.The Thomeer parameters B_v,P_d,and G and the modal element Porositon of the maximum pore throat diameter were calculated using the logarithmic mean of T2 transverse relaxation time for NMR (T2LM) and the NMR total porosity (MPHS),as well as the classification of pore throat R35.Accordingly,the saturation evaluation model for carbonates reservoirs with complex pore structures was constructed.This model allows for the continuous evaluation of formation pore structure that cannot be achieved using experimental methods.This model was applied to the saturation evaluation of the carbonate reservoirs with complex pore structures in oilfield X in the Middle East.By comparison with the J function model and Archie's formula,this model decreased the relative error from 0.496 and 0.442,respectively to 0.272,better characterized the variation trend,and achieved encouraging application effects regardless of the saturation of reservoirs.Therefore,this model can minimize the impacts of carbonate reservoirs with complex pore structures and improve the precision of the reservoir saturation evaluation.

Key words： Carbonate saturation nuclear magnetic resonance logging Thomeer function capillary pressure curve

Received: 19 November 2021 Published: 24 February 2023

ZTFLH:

P631.4

Corresponding Authors: ZHANG Chao-Mo E-mail: 1637715221@qq.com;zhangcm@yangtzeu.edu.cn

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	Xing-He CHEN
	Chao-Mo ZHANG
	Lin-Qi ZHU
	Chong ZHANG
	Zhan-Song ZHANG
	Jian-Hong GUO

Cite this article:

Xing-He CHEN,Chao-Mo ZHANG,Lin-Qi ZHU, et al. Evaluation of the saturation of carbonate reservoirs by combining the nuclear magnetic resonance logging and the Thomeer model[J]. Geophysical and Geochemical Exploration, 2023, 47(1): 110-119.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2023.2606 OR https://www.wutanyuhuatan.com/EN/Y2023/V47/I1/110

Porosity-permeability relationship of rock core

Thomeer schematic diagram

Parameter extraction diagram of Thomeer jacobian determinant method

Relationship between T2LM and Porositon

Relationship between Porositon and P_d₁

Relationship between MPHS and B_v₁

Relationship between P_d₁ and G₁

参数	计算公式
Porositon	$P = 10 3.0277 × (l o g T 2 L M) 2 - 9.1427 × l o g T 2 L M + 5.6812$
B_v₁	B_v₁=120.98×MPHS-0.6085
P_d₁	P_d₁=P^-1^.⁰³⁴⁴×10¹^.⁸
G₁	G₁= $P d 1 0.809$ ×10^-3^.¹⁹⁶²

Thomeer curve 1 parameter calculation formula

Petrophysical rock typing result based on R35 parameter slope method

Boundaries of petrophysical rock typing

Thomeer curve 2 parameters values of different petrophysical rock typing

Common interfacial tension and wetting angle

J-function of average capillary pressure curve

Log interpretation results of some intervals in well MXX(track 7 is the saturation calculation result of the method proposed in this paper, and track 8 is the saturation calculation result of the J function method, track 9 is the saturation calculation result of the Archie’s formulas)

Comparative analysis of effects undert the accuracy of ±5%
a—Thomeer saturation model for combined nuclear magnetic resonance logging;b—J function saturation model;c—Archie formula saturation model

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