Formation Selection Criteria for Volume Fracturing in Chang 7 Tight Reservoir in the Ordos Basin

Huayu YUAN, Yuanfang CHENG, Youzhi LI

Abstract


The Ordos basin possesses abundance of tight oil and it has huge commercial potential. Volume fracturing is an effective means for the exploitation of tight oil which is a significant impact by geological conditions. So far, the formation selection criteria targeting on volume fracturing of Chang 7 tight reservoir in the Ordos basin have not been established. This paper combined the experiments of rock mechanics and the fracturing simulating software Meyer, and built the selection criteria of Chang 7 tight reservoir in terms of the horizontal stress difference, the brittle index and the natural fractures. It is shown that the horizontal stress difference in Chang 7 tight reservoir is 6-12 MPa, the brittle index based on elastic parameters is 30-48, with strikingly regional natural fracture growth. The fracture geometry induced by volume fracturing is affected by the horizontal stress difference, the brittle index and the natural fracture numbers together. Complex fracture networks are likely to form in a highly naturally fractured section with the in-situ stress difference below 8 MPa and the brittle index over 40. The selection criteria is adequate for optimum formation selection and it has guide function in fieldwork which proved by field practice.

Keywords


Ordos basin; Tight oil; Volume fracturing; Formation selection criteria; Stimulated reservoir volume; Horizontal stress difference; Brittle index; Natural fracture

Full Text:

PDF

References


[1] Lin, S. H., Zou, C. N., & Yuan, X. J. (2011). Status quo of tight oil exploitation in the United States and its implication. Lithologic Reservoirs, 23(4), 25-30.

[2] Li, X. J., Hu, S. Y., & Cheng, K. M. (2007). Suggestions from the development of fractured shale gas in North America. Petroleum Exploration and Development, 34(4), 392-400.

[3] Jia, C. Z., Zheng, M., & Zhang, Y. F. (2012). Unconventional hydrocarbon resources in China and the prospect of exploration and development. Petroleum Exploration and Development, 39(2), 129-136.

[4] Qiu, Z., Zou, C. N., & Li, J. Z. (2013). Unconventional petroleum resources assessment: Progress and future prospects. Natural Gas Geoscience, 24(2), 238-246.

[5] Zhang, H. (2013). Lessons for shale oil & gas development from that of tight oil & gas and coalbed methane gas in China. Natural Gas Industry, 33(4), 18-25.

[6] Wang, S. F., An, W. H., & Chen, P. (2013). Characteristic and development techniques of Sulige tight gas pool. Natural Gas Geoscience, 24(1), 138-145.

[7] Cheng, Y. F., Li, Y. Z., & Shi, X. (2013). Analysis and application of fracture network models of volume fracturing in shale gas reservoirs. Natural Gas Industry, 33(9), 53-59.

[8] Chen, F. J., Yang, Y., Liu, S. F. (2012). Study on the optimization of staged fracturing of a horizontal well in a tight gas reservoir with low permeability. Special Oil & Gas Reservoir, 19(6), 85-87.

[9] Li, J. B., Bai, J. W., & Zhu, L. (2013). Volume fracturing and its practices in Sulige tight sandstone gas reservoirs. Natural Gas Industry, 33(9), 1-5.

[10] Weng, D. W., Lei, Q., & Xu, Y. (2011). Network fracturing techniques and its application in the field. Acta Petrol EI Sinical, 32(2), 280-284.

[11] Zeng, L. B., Li, Z. X., & Shi, C. G. (2007). Characteristics and origin of the fracture in the extra low permeability sandstone reservoirs of the upper Triassic Yanchang Formation in the Ordos basin. Acta Geologica Sinica, 81(2), 174-180.

[12] Zeng, L. B. (2008). Generation and distribution of the fracture in the extra low permeability sandstone reservoirs (pp.75-83). Beijing, China: Science Press.




DOI: http://dx.doi.org/10.3968/7674

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:1055 Rue Lucien-L'Allier, Unit #772, Montreal, QC H3G 3C4, 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