Effect of pore structure on the seepage characteristics of tight sandstone reservoirs: A case study of Upper Jurassic Penglaizhen Fm reservoirs in the western Sichuan Basin

被引：0

作者：

Sima L. ^{[1
]}

Wang C. ^{[1
]}

Wang L. ^{[1
]}

Wu F. ^{[1
]}

Ma L. ^{[1
]}

Wang Z. ^{[3
]}

机构：

[1] School of Geosciences and Technology, Southwest Petroleum University, Chengdu, 610500, Sichuan

[2] Well Logging Company, CNPC Chuanqing Drilling Engineering Co., Ltd., Chongqing

[3] Xi'an Changyuan Petroleum Technology Service Co., LLC, Xi'an, 710076, Shaanxi

来源：

Natural Gas Industry | 2016年 / 36卷 / 12期

关键词：

Gas-water two-phase; Late Jurassic; Penglaizhen Fm; Pore structure; Relative permeability experiment; Seepage characteristics; Sichuan Basin; Tight sandstone; Visual microscopic model;

D O I：

10.3787/j.issn.1000-0976.2016.12.003

中图分类号：

学科分类号：

摘要：

Tight sandstone reservoirs are characterized by complex pore structures and strong heterogeneity, and their seepage characteristics are much different from those of conventional sandstone reservoirs. In this paper, the tight sandstone reservoirs of Upper Jurassic Penglaizhen Fm in western Sichuan Basin were analyzed in terms of their pore structures by using the data about physical property, mercury injection and nuclear magnetic resonance (NMR) tests. Then, the seepage characteristics and the gas-water two-phase migration mechanisms and distribution of tight sandstone reservoirs with different types of pore structures in the process of hydrocarbon accumulation and development were simulated by combining the relative permeability experiment with the visual microscopic displacement model. It is shown that crotch-like viscous fingering occurs in the process of gas front advancing in reservoirs with different pore structures. The better the pore structure is, the lower the irreducible water saturation is; the higher the gas relative permeability of irreducible water is, the more easily the gas reservoir can be developed; that at the late stage of development, the residual gas is sealed in reservoirs in the forms of bypass, cutoff and dead end; that in various reservoirs, the interference between gas and water is stronger, so gas and water tends to be produced simultaneously; and that the sealed gas may reduce the production rate of gas wells significantly, and the existence of water phase may reduce the gas permeability greatly, consequently, the water-bearing low-permeability tight sandstone gas reservoirs reveal serious water production, highly-difficult development and low-recovery percentage at the late stage, which have adverse impacts on the effective production and development of gas wells. © 2016, Natural Gas Industry Journal Agency. All right reserved.

引用

页码：18 / 25

页数：7

共 23 条

[1]

Gao W., The effect of pore structure on the characteristics of percolation flow curves of Ansai low-permeability reservoir, Petroleum Exploration and Development, 31, 1, pp. 79-80, (2003)

[2]

Hu Y., Zhu H., Wan Y., Han Y., Wang Y., The pore structure and the properties of water-gas flowing through porous media in a volcanic rock in Daqing, Journal of Southwest Petroleum University, 29, 5, pp. 63-65, (2007)

[3]

Xu G., Zhao L., Xu F., Zhang T., Zhao X., Zhang Z., Et al., Seepage flow characteristics of tight sandstone reservoirs in Huagang Formation in a certain structure of Xihu Depression in East China Sea Basin, Journal of Chengdu University of Technology: Science & Technology Edition, 39, 2, pp. 113-121, (2012)

[4]

Liu J., Tang J., Mircoscopic pore texture and percolation features in the low permeability reservoirs and their geological significance in Xihu sag: A case of Huagang Formation in HY structure, China Offshore Oil and Gas, 25, 2, pp. 18-23, (2013)

[5]

Pang Z., Sun W., Li J., Ma E., Gao H., Microscopic pore structure and seepage characteristics of low-permeability and tight sandstone gas reservoir: Taking blocks Su 48 and Su 120 in Sulige gas field as an example, Geological Science and Technology Information, 32, 4, pp. 133-138, (2013)

[6]

Fu X., Sun W., Study of microscopic oil-water displacement mechanism of low-permeability reservoir-an example of Chang 8<sub>2</sub> reservoir in wellblock Zhuang-19 of Xifeng oilfield, Xinjiang Petroleum Geology, 26, 6, pp. 681-683, (2005)

[7]

Quan H., Zhu Y., Zhang H., Li L., Shao F., Zhang Z., Reservoir pore structure and micro-flow characteristics of waterflooding-a case study from Chang-6 reservoir of Wangyao block in Ansai oilfield, Oil & Gas Geology, 32, 6, pp. 952-960, (2011)

[8]

Zhang Z., Zhu J., Yu F., Li C., Wang L., Li W., Reservoir characteristics of thick sandstone and micro-anisotropy of delta front micro-facies: A case study of Chang 6 reservoir in Wucangbu area, Geological Bulletin of China, 35, 2-3, pp. 440-447, (2016)

[9]

Zhou K., Li N., Zhang Q., Tang X., Experimental research on gas-water two-phase flow and confined gas formation mechanism, Natural Gas Industry, 22, pp. 122-125, (2002)

[10]

Zhu H., Zhou J., Wan Y., Huang L., Microscopic mechanism study of gas-water flow in porous media, Petroleum Geology & Experiment, 26, 6, pp. 571-573, (2004)

← 1 2 3 →