Characterization and Consecutive Prediction of Pore Structures in Tight Oil Reservoirs

Zhaohui Xu, Peiqiang Zhao, Zhenlin Wang, Mehdi Ostadhassan and Zhonghua Pan
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Zhaohui Xu: College of Geosciences, China University of Petroleum, Beijing 102249, China
Peiqiang Zhao: Institute of Geophysics and Geomatics, China University of Geosciences, Wuhan 430074, China
Zhenlin Wang: Research Institute of Exploration and Development, Xinjiang Oilfield Company, PetroChina, Karamay 834000, China
Mehdi Ostadhassan: Petroleum Engineering Department, University of North Dakota, Grand Forks, ND 58202, USA
Zhonghua Pan: Wuhan Geomatic Institute, Wuhan 430022, China

Energies, 2018, vol. 11, issue 10, 1-15

Abstract: The Lucaogou Formation in Jimuaser Sag of Junggar Basin, China is a typical tight oil reservoir with upper and lower sweet spots. However, the pore structure of this formation has not been studied thoroughly due to limited core analysis data. In this paper, the pore structures of the Lucaogou Formation were characterized, and a new method applicable to oil-wet rocks was verified and used to consecutively predict pore structures by nuclear magnetic resonance (NMR) logs. To do so, a set of experiments including X-ray diffraction (XRD), mercury intrusion capillary pressure (MICP), scanning electron microscopy (SEM) and NMR measurements were conducted. First, SEM images showed that pore types are mainly intragranular dissolution, intergranular dissolution, micro fractures and clay pores. Then, capillary pressure curves were divided into three types (I, II and III). The pores associated with type I and III are mainly dissolution and clay pores, respectively. Next, the new method was verified by “as received” and water-saturated condition T 2 distributions of two samples. Finally, consecutive prediction in fourteen wells demonstrated that the pores of this formation are dominated by nano-scale pores and the pore structure of the lower sweet spot reservoir is more complicated than that in upper sweet spot reservoir.

Keywords: Lucaogou Formation; tight oil; pore structure; prediction by NMR logs (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View complete reference list from CitEc
Citations: View citations in EconPapers (6)

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