Influence of Sandstone Architecture on Waterflooding Characteristics in Common Heavy Oil Reservoir

Abstract

Taking common heavy oil reservoir as an example, we characterized spatial structure characteristics of delta front and analyzed waterflooding characteristics of underwater distributary channel sand, mouth bar sand, and beach bar sand, finally cleared the fact that sandstone architecture has influence on waterflooding characteristics in common heavy oil reservoir. The research results show that spatial structure characteristics of delta front are complicated: vertically, single sand bodies have independent, superposed, and cutting-stacked contacts with each other. Sandstone architecture has great influence on waterflooding development: Underwater distributary channel sand has positive rhythm characteristics, and mouth bar sand has weak inverted rhythm characteristics with low permeability contrast value as well as beach bar sand has homogeneous rhythm characteristics. Therefore, at the process of waterflooding development, because of the influence of gravity and high viscosity of heavy oil, the bottom part of underwater distributary channel and the bottom part of most mouth bar sands are priorly waterflooded, while beach bar sand is waterflooded uniformly; long-term waterflooding and high viscosity characteristics of heavy oil will lead to formation of dominant water flowing channel in sand inside and cause remaining oil accumulate at the top of sands, which are the main target for late tapping.

Copyright 2017, Shaanxi Petroleum Society.

This paper was prepared for presentation at the 2017 International Field Exploration and Development Conference in Chengdu, China, 21–22 September 2017.

This paper was selected for presentation by the IFEDC&IPPTC Committee following review of information contained in an abstract submitted by the author(s). Contents of the paper, as presented, have not been reviewed by the IFEDC&IPPTC Committee and are subject to correction by the author(s). The material does not necessarily reflect any position of the IFEDC&IPPTC Committee, its members. Papers presented at the Conference are subject to publication review by Professional Committee of Petroleum Engineering of Shaanxi Petroleum Society. Electronic reproduction, distribution, or storage of any part of this paper for commercial purposes without the written consent of Shaanxi Petroleum Society is prohibited. Permission to reproduce in print is restricted to an abstract of not more than 300 words illustrations may not be copied. The abstract must contain conspicuous acknowledgment of IFEDC&IPPTC. Contact email: paper@ifedc.org or paper@ipptc.org.