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1

Study on acoustic logging response of fractured reservoirs using a novel equivalent medium model

Wang Bing, Li Wei, Lu Jing, Jin Wujun, Hu Song

Acta Geophysica

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2022

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Vol. 70, no 6

2695--2704

EN

Acoustic logging is one of the most effective methods for fractured reservoirs exploration. To understand the measurement characteristics of fractured reservoirs is the key procedure to evaluate the reservoir using acoustic logging data. By combing the Hudson equivalent theory and the Schoenberg’s theory, a novel acoustic equivalent medium theory of fracture reservoir was constructed. Bond transformation is introduced to model fractures with arbitrary azimuth and polarizing angle. The response of fractured reservoir measured by acoustic logging tool is simulated using a finite difference code. The influences and acoustic responses from crack density, width, angle and filling material on compressional and shear wave slowness of acoustic waves are analyzed and summarized. The analysis results can provide a theoretical foundation for evaluations of fractured formations with acoustic logging data.

2

Viscoelasticity expression and extension of seismic dispersion and attenuation in porous media with multiple fracture sets

Zhang Jinwei, Ding Renwei, Zhao Lihong, Wang Deying

Acta Geophysica

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2020

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Vol. 68, no. 6

1679--1688

EN

Intensive studies have been conducted on fuid-related seismic dispersion and attenuation in saturated anisotropic media. Most of the studies are concentrated on the transversely isotropy media. However, the fractures distribution in subsurface reservoirs is often complex. When there are multiple fracture sets developing in a porous background, the signatures of seismic dispersion and attenuation remain unclear. In this paper, we propose a method to calculate the frequency-dependent stifness matrix of a porous medium with multiple fractures sets from a perspective of viscoelasticity. Due to the favorable approximation performance of the generalized standard linear solid model and Chapman model, we use a modifed form of generalized standard linear solid model to simulate the frequency-dependent stifness tensor of porous media with multiple fracture sets. The representation of the stifness tensor utilizes the modulus defect to denote the efects the fractures including fracture density and geometry. With the procedure of calculating the stifness tensors at low- and high-frequency limits, we can easily calculate the frequency-dependent stifness tensor for media with multiple fracture sets with arbitrary orientations and directions. We then analyze the efects of the fracture parameters on the viscoelasticity characteristics taking orthotropic medium as an example. The results can help to understand the viscoelasticity and the mesoscopic seismic attenuation associated with fractures and fuids and can provide a practical rock physics model when dealing with reservoirs with complex fracture patterns.

3

Analiza zjawisk wchłaniania kapilarnego w szczelinowatych utworach dolomitu głównego

Lubaś J., Masłowski M.

Prace Naukowe Instytutu Nafty i Gazu

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2010

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nr 170 wyd. konferencyjne

247--254

PL

Wykorzystując analityczny model Aronofsky'ego przedstawiono analizę zjawisk odzysku ropy podczas wchłaniania kapilarnego w procesach nawadniania złóż szczelinowatych. Badania laboratoryjne nasycania wodą próbek rdzeni z dolomitu głównego zawierających ropę złożową prowadzono w funkcji czasu, w okresie 30 dni. W referacie przedstawiono krzywe odzysku ropy otrzymane podczas eksperymentalnego wypierania wodą, które określiły bardzo niską sprawność procesu. Wykazano, że wchłanianie kapilarne nie może stanowić dominującego mechanizmu wydobywania ropy w procesach nawadniania tego typu kolektorów.

EN

The analysis of imbibition waterflooding in naturally fractured reservoirs has been presented with the use of Aronofsky analytical model describing oil recovery. Water imbibition for core samples of the Main Dolomite containing reservoir oil was conducted during 30 days. The oil recovery curves obtained from water imbibition laboratory experiments presented in the article indicated a very low rate of the process. Spontaneous imbibition will not be a dominating mechanism of oil production during the waterflooding in this type of rocks.

4

Analiza zjawisk wchłaniania kapilarnego w szczelinowatych utworach dolomitu głównego

Lubaś J., Masłowski M.

Nafta-Gaz

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2010

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R. 66, nr 6

466-470

PL

Wykorzystując analityczny model Aronofsky’ego przedstawiono analizę zjawisk odzysku ropy podczas wchłaniania kapilarnego w procesach nawadniania złóż szczelinowatych. Badania laboratoryjne nasycania wodą próbek rdzeni z dolomitu głównego zawierających ropę złożową prowadzono w funkcji czasu, w okresie 30 dni. W artykule przedstawiono krzywe odzysku ropy otrzymane podczas eksperymentalnego wypierania wodą, które określiły bardzo niską sprawność procesu. Wykazano, że wchłanianie kapilarne nie może stanowić dominującego mechanizmu wydobywania ropy w procesach nawadniania tego typu kolektorów.

EN

The analysis of imbibition waterflooding in naturally fractured reservoirs has been presented with the use of Aronofsky analytical model, describing oil recovery. Water imbibition for core samples of the main dolomite containing reservoir oil was conducted during 30 days. The oil recovery curves obtained from water imbibition laboratory experiments presented in the article indicated a very low rate of the process. Spontaneous imbibition will not be a dominating mechanism of oil production during the waterflooding in this type of rocks.