Calculation and Evaluation Method of Reservoir Parameters in Multiple Oil Reservoirs Based on Flow Unit

doi:10.19657/j.geoscience.1000-8527.2020.02.15

Abstract

Abstract:

For the long oil-bearing section and high heterogeneity reservoir in Yingdong area, the conventional permeability model cannot meet the requirement of reservoir evaluation accuracy. Integrating the data of formation testing and MDT, the logging response features of oil, gas, water and dry layer are analyzed. We attempt to characterize the permeability fractions with the flow-band index, which characterizes the stratigraphy according to “unitized classification evaluation”. Meanwhile, we have established the calculation model of permeability flow-band index under electrical parameters. Evaluation results of actual production data in the study area show that the absolute error (of flow zone exponential permeability model) is basically controlled under half order of magnitude, and the relative errors are below 25%. The results improve significantly the prediction accuracy of heterogeneous reservoir permeability, and satisfy the actual reservoir conditions to meet the needs of reservoir description and production. This has an important guiding significance for heterogeneity studies and for enhancing interlayer water absorption contradiction of complex reservoirs.

Key words: long interval, permeability, heterogeneity, reservoir parameter

CLC Number:

TE311

MA Fengchun, LIU Jincheng, WU Yanxiong, LIANG Xiaoyu, JIANG Yinghai, WANG Lin, ZHOU Yan, XIANG Yiwei. Calculation and Evaluation Method of Reservoir Parameters in Multiple Oil Reservoirs Based on Flow Unit[J]. Geoscience, 2020, 34(02): 370-377.

Figures/Tables 7

Fig.1 Cross-plot of core analyzed permeability and porosity

Fig.2 Cross-plot of FZI analyzed permeability and porosity in layer N22

Fig.3 Cross-plot of FZI analyzed permeability and porosity in layer N21(K3-K4)

Fig.4 Cross-plot of FZI analyzed permeability and porosity in layer N21(under K4)

Fig.5 Cross-plot of core analyzed permeability and calculated porosity

Table 1 Correlation analysis of logging curve and analyzed porosity FZI

类型	Rxo	Rt	(Rt-Rxo)/Rt	DEN	AC	CNL	GR	Φ	FZI
Rxo	1.00	0.15	-0.45	-0.31	0.45	-0.48	-0.22	0.19	0.12
Rt		1.00	0.85	0.75	-0.61	0.31	0.14	-0.70	-0.86
(Rt-Rxo)/Rt			1.00	0.80	-0.68	0.50	0.23	-0.69	-0.77
DEN				1.00	-0.80	0.11	-0.05	-0.88	-0.69
AC					1.00	-0.12	-0.011	0.80	0.37
CNL						1.00	0.20	-0.18	-0.30
GR							1.00	-0.05	0.10
Φ								1.00	0.84
FZI									1.00

Fig.6 Cross-plot of core analyzed permeability and calculated porosity

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