强纵向非均质性油藏油水层识别及油水界面精细刻画

doi:10.13809/j.cnki.cn32-1825/te.2021.03.019

Abstract

Abstract:

K oil reservoir, in Oilfield-A, Iraq, is a typical porous carbonate reservoir. It is characterized by complex pore structure, wide range of resistivity and complex oil-water contact（OWC）. In order to establish the reliable criteria for fluid typing and ascertain the OWC, firstly, the study of pore structure has been taken as a starting point, and the relationship between resistivity and elevation has been taken an insight into. Then a new criteria for fluid typing and OWC for each sub zone have been established by incorporating well testing and production dynamics. Lastly, the lateral variation of OWC and its genesis is analyzed based on structural evolution and hydrocarbon accumulation history. The results are as follows. ①Pore structure of the K oil reservoir shows strong longitudinal stratification characteristics, and the amount of mold pores and interparticle pores as well as effective pore-throat radius increases upwards. ②Vertical variation in pore structure is the main controlling factor of the identification criteria for oil and water layers and OWC variations for each sub layer. The layers dominated by micropores have small pore-throats radius, high displacement pressure, high OWC and low reservoir resistivity threshold, while the layers dominated by interparticle pores and mold pores are the opposite. ③The OWC is curved laterally, and slopes eastward along the long axis of the structure in the same small layer. Along the short axis of the structure, the contact is arched, that is the north and south margin is lower than the structure crest, and the lowest contact is in the northeast margin. ④The determination of the curved OWC has been verified by the reservoir interpretation of 85 vertical wells and the production dynamics of more than 260 horizontal wells. This study provides not only an effective solution for water control and stabilizing oil production but also a guideline for further optimization of field development plan and trajectory adjustment of horizontal wells.

Key words: carbonate reservoir, pore structure, heterogeneity, identification of fluid typing, oil-water contact（OWC）

CLC Number:

TE122.2

CHEN Mingjiang,LIU Junhai,CHENG Liang. Identification of fluid type and fine characterization of oil-water contact for an oil reservoir with strong vertical heterogeneity[J].Petroleum Reservoir Evaluation and Development, 2021, 11(3): 428-436.

Figures/Tables 8

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Table 1

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Table 2

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References 27

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小层	岩相	主要孔隙类型	有效喉道半径（μm）	岩心孔隙度（%）			岩心渗透率（10^-3μm²）
小层	岩相	主要孔隙类型	有效喉道半径（μm）	最小	最大	平均	最小	最大	平均
Kh^2-1-1	砂屑生屑泥粒灰岩	微孔、粒间孔	0.75	12.7	25.4	20.1	0.27	537	3.4
Kh^2-1-2U	砂屑泥粒灰岩	粒间孔、微孔	2.86	8.8	25.9	19.7	2.22	522	19.4
Kh^2-1-2L	砂屑颗粒灰岩	粒间孔	7.16	12.7	27.8	19.5	0.40	1 042	172.8
Kh^2-2	生屑砂屑藻屑泥粒灰岩	藻模孔、粒间孔	1.10	6.0	30.2	24.8	0.76	475.9	9.8
Kh^2-3	生屑藻屑泥粒灰岩	藻模孔	1.92	2.1	30.0	24.5	0.026	476	17.5
Kh^2-4	生屑粒泥灰岩	微孔、藻模孔	0.445	19.6	30.0	25.1	0.18	19.4	3.2
Kh^2-5	浮游有孔虫粒泥灰岩	微孔	0.25	9.5	27.7	23.1	0.092	18.3	1.1

小层		电阻率（Ω·m）				油水界面（m）
小层		油层	油水层	水层		油层底界海拔	水层顶界海拔
Kh^2-1-1		≥1.3	1.3~0.9	≤0.9		-2 614	-2 627
Kh^2-1-2U		≥3.0	3.0~1.8	≤1.8		-2 629	-2 632
Kh^2-1-2L		≥3.5	3.5~2.0	≤2.0		-2 629	-2 633
Kh^2-2		≥1.1	1.1~0.7	≤0.7		-2 626	-2 635
Kh^2-3		≥2.5	2.5~1.0	≤1.0		-2 635.5	-2 642
Kh^2-4	上部	≥1.1	1.1~0.7	≤0.7		-2 614	-2 627
Kh^2-4	下部	≥0.6	0.6~0.5	≤0.5	-2 611.5		-2 622
Kh^2-5		干层

Identification of fluid type and fine characterization of oil-water contact for an oil reservoir with strong vertical heterogeneity

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