Influence of the Pore Structures on Stress Sensitivity of Tight Sandstone Reservoir

Xiaoxia REN, Aifen LI, Bingqing HE, Songtao WU

Abstract


The percolation of oil and gas in tight sandstone reservoir is different from conventional reservoir due to its tight lithology, tiny pore throat, Jamin effect and strong stress sensitivity. To well study the influence of pore structures on stress sensitivity of tight sandstone reservoir, the pore structures of Chang-6 reservoir were characterized using automated scanning electron microscope (QEMSCAN), casting lamella, laser scanning confocal microscope (LSCM), field emission scanning electron microscope (FESEM) and mercury intrusion porosimetry. The results indicated that the reservoir had low average surface, complex pore structure and strong heterogeneity. Intragranular and intergranular dissolved pores which were mainly potassium feldspar dissolved pores were developed in the reservoir, and some chlorites were developed around these pores. The contact types between grains were dominantly line and point-line contact; the sorting of pores and throats was fair. The ratio of micro-pores was extremely low, while the ratios of submicro-pores and nano-pores were up to 40.66% and 59.10%, respectively. Before the effective stress was increased to 20 MPa, nano-pores which were abundant in Chang-6 reservoir would be closed firstly, resulting in lager reduction of permeability. As the effective stress was increased, the reduction of permeability got smaller. As the effective stress was reduced, the equivalent liquid permeabilities of cores were increased because the chlorite developed around the pores enhanced the compression resistance of grains, and the final recovery rate was in the range of 78% to 92%.


Keywords


Tight sandstone; Pore structure characteristic; Stress sensitivity; Loss of permeability; Permeability restore ratio

Full Text:

PDF

References


[1] Li, A. F. (2011). Reservoir physics. Dongying, China: Petroleum University Press.

[2] Teng, Q., Sun, J. C., Yang, Z. M. (2013, March). Comparative study on stress-dependent permeability of ultra-low permeability sandstone rock using different types of fluid media. Paper presented at International Petroleum Technology Conference, Beijing, China.

[3] Chen, S., Li, H., & Zhang, Q. (2006, June). A new model for production prediction in stress sensitive reservoirs. Paper presented at Canadian International Petroleum Conference, Calgary, Alberta.

[4] Lei, Q., Xiong, W., Yuang, J. R., Cui, Y. Q., & Wu, Y. S. (2007, October). Analysis of stress sensitivity and its influence on oil production from tight reservoirs. Paper presented at Eastern Regional Meeting, Lexington, Kentucky, USA.

[5] Li, K., & Li, L. (2012, November). A new production model by considering the pressure sensitivity of permeability in oil reservoirs. Paper presented at Abu Dhabi International Petroleum Conference and Exhibition, Abu Dhabi, UAE.

[6] Jiao, C., He, S., & Xie, Q. (2011). An experimental study on stress-dependent sensivity of ultra-low permeability sandstone reservoirs. Acta Petroleum, 32(3), 489-494.

[7] Yang, J., Li, K., & Zhang, D. (1992). Petroleum Geology of China (Vol. 12): Changqing oilfield. Beijing: Petroleum Industry Press.

[8] Zhang, J., Chen, S., & Xiao, Y. (2013). Characteristics of the Chang 8 tight sandstone reservoirs and their genesis in Huaqing area, Ordos Basin. Oil & Gas Geology, 34(5), 679-684.

[9] Niu, X., Feng, S., & Liu, F. (2013). Microscopic occurrence of oil in tight sandstones and its relation with oil sources: A case study from the Upper Triassic Yanchang formation, Ordos basin. Oil & Gas Geology, 34(3), 288-293.

[10] Jing, C., Pu, C. S., & Song, Z. Q. (2015). A method of quantitative evaluation of diagenetic reservoir facies of tight gas reservoirs with logging multi-parameters: A case study in Sulige area, northern Ordos basin, China. Advances in Petroleum Exploration and Development, 10(1), 33-37.

[11] Zhang, X. L., Duan, Y., & He, J. X. (2011). Geochemical characteristics of crude oil in lower part of Yanchang formation and correlation of oil source in Huaqing area of Ordos basin. Natural Gas Geoscience, 22(5), 866-873.

[12] Sun, J. X., Han, L. J., & Jia, J. H. (2015). Study on damage characteristics and formation protective drilling fluids in Dongying formation low permeability reservoir of Chengbei oilfield. Advances in Petroleum Exploration and Development, 10(1), 38-43.

[13] Formation damage evaluation by flow test. SY / T 5358-2002.

[14] Terzaghi, K. (1923). The relation between elasticity and internal pressure. Sitzungsber. Akad. Wi. Wien Math.-Naturwi. Kl., 132, 105-124.

[15] Ruan, M., & Wang, L. (2002). Low-permeability oilfield development and pressure-sensitive effect. Acta Petrolei Sinica, 23(3), 73-76.

[16] Zhu, P., Huang, S., & Li, D. (2004). Effect and protection of chlorite on clastic reservoir rocks. Journal of Chengdu University of Technology, 31(2), 153-156.




DOI: http://dx.doi.org/10.3968/7663

Refbacks

  • There are currently no refbacks.


Copyright (c) 2015 Advances in Petroleum Exploration and Development




Share us to:   


Reminder

  • How to do online submission to another Journal?
  • If you have already registered in Journal A, then how can you submit another article to Journal B? It takes two steps to make it happen:

1. Register yourself in Journal B as an Author

  • Find the journal you want to submit to in CATEGORIES, click on “VIEW JOURNAL”, “Online Submissions”, “GO TO LOGIN” and “Edit My Profile”. Check “Author” on the “Edit Profile” page, then “Save”.

2. Submission

  • Go to “User Home”, and click on “Author” under the name of Journal B. You may start a New Submission by clicking on “CLICK HERE”.

We only use three mailboxes as follows to deal with issues about paper acceptance, payment and submission of electronic versions of our journals to databases:
caooc@hotmail.com; aped@cscanada.net; aped@cscanada.org

 Articles published in Advances in Petroleum Exploration and Development are licensed under Creative Commons Attribution 4.0 (CC-BY)

ADVANCES IN PETROLEUM EXPLORATION AND DEVELOPMENT Editorial Office

Address:1020 Bouvier Street, Suite 400, Quebec City, Quebec, G2K 0K9, Canada.

Telephone: 1-514-558 6138
Website: Http://www.cscanada.net
Http://www.cscanada.org
E-mail:office@cscanada.net;  office@cscanada.org

Copyright © 2010 Canadian Research & Development Centre of Sciences and Cultures