Pore structure characteristics of tight-oil sandstone reservoir based on a new parameter measured by NMR experiment: A case study of seventh Member in Yanchang Formation, Ordos Basin

被引：0

作者：

Dai Q. ^{[1
]}

Luo Q. ^{[1
,2
]}

Zhang C. ^{[3
]}

Lu C. ^{[3
]}

Zhang Y. ^{[1
]}

Lu S. ^{[1
]}

Zhao Y. ^{[1
]}

机构：

[1] Unconventional Natural Gas Institutes, China University of Petroleum, Beijing

[2] State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing

[3] College of Geosciences, China University of Petroleum, Beijing

来源：

Shiyou Xuebao/Acta Petrolei Sinica | 2016年 / 37卷 / 07期

关键词：

Characteristic parameter; Effective porosity of movable fluid; Nuclear magnetic resonance; Pore structure; Tight-oil sandstone reservoir;

D O I：

10.7623/syxb201607007

中图分类号：

学科分类号：

摘要：

Based on NMR (nuclear magnetic resonance) technology in combination with high-pressure Hg injection, scanning electron microscope (SEM) and other experimental data, 66 core samples of tight-oil sandstone reservoir in seventh Member of Yanchang Formation, Heshui block, Ordos Basin were analyzed in this study. Then a new pore structure parameter was proposed, i. e., effective porosity of movable fluid. This parameter not only can overcome the impact of small porosity measured by NMR experiment, but also takes into account the movable fluid in the pores influenced by two factors, i. e., the viscosity of hydrophilic particulate on pore surface and the constraint of tiny throats nearby. The size of effective pore space occupied by movable fluid can be quantitatively calibrated to more accurately reflect the pore structure characteristics of tight-oil reservoir and make up the defects in effectiveness evaluation of pore throat using the existing parameters such as the porosity of movable fluid. Through analyzing the relation between pore structure characteristics and the influence of new parameter, it has been found that the better the connectivity of pore throat is, the larger the effective porosity of movable fluid will be; when pore-throat sorting coefficient is within the range of 1.4-1.9, the effective porosity of movable fluid can reach the maximum; different levels of pore-throat configurations are the key for pore-throat effectiveness in tight-oil sandstone reservoir. Then, based on the effective porosity of movable fluid as major criteria, pore structures in the study area can be divided into three types, i. e., Type I - the effective porosity of the movable fluid is large than 2%; Type II - the effective porosity is ranged between 1% and 2%; Type III - the effective porosity is smaller than 1%. Accordingly, the classified evaluation standard should be established for tight-oil sandstone reservoir to guide the exploration and development of oil field. © 2016, Editorial Office of ACTA PETROLEI SINICA. All right reserved.

引用

页码：887 / 897

页数：10

共 31 条

[1]

Jia C., Zheng M., Zhang Y., Four important theoretical issues of unconventional petroleum geology, Acta Petrolei Sinica, 35, 1, pp. 1-10, (2014)

[2]

Zou C., Tao S., Hou L., Et al., Unconventional Petroleum Geology, pp. 1-310, (2011)

[3]

Johnstone B., Bakken black gold

[4]

Luo Z., Wang Y., Pore Structure of Oil Gas Reservoir, pp. 21-139, (1986)

[5]

Qiu Y., Xue S., Evaluation Technology of Oil Gas Reservoir, pp. 71-96, (1997)

[6]

Wang G., He D., Li Y., Et al., Tight sandstone reservoir analysis and porosity-evolution quantitative simulation of the Badaowan Formation in the Baka Gas Field, Turpan-Hami Basin, Acta Geologica Sinica, 86, 11, pp. 1847-1856, (2012)

[7]

Yang X., Qiu Y., Formation process and distribution of laumontite in Yanchang Formation (Upper Triassic) of Ordos Basin, Acta Sedimentologica Sinica, 20, 4, pp. 628-632, (2002)

[8]

Nelson P.H., Pore-throat sizes in sandstones, tight sandstones, and shales, AAPG Bulletin, 93, 3, pp. 329-340, (2009)

[9]

Loucks R.G., Reed R.M., Ruppel S.C., Et al., Morphology, genesis, and distribution of nanometer-scale pores in siliceous mudstones of the Mississippian Barnett shale, Journal of Sedimentary Research, 79, 12, pp. 848-861, (2009)

[10]

Desbois G., Urai J.L., Kukla P.A., Morphology of the pore space in claystones-evidence from BIB /FIB ion beam sectioning and cryo-SEM observations, eEarth, 4, 1, pp. 15-22, (2009)

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