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中南大学学报(英文版)

Journal of Central South University

Vol. 23    No. 3    March 2016

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Applications of fluid substitution effect analysis on seismic interpretation
CHEN Wei(陈伟)1,2, WANG Shang-xu(王尚旭)1,2, CHUAI Xiao-yu(啜晓宇)3, LIU Yong(刘勇)1,2

1. State Key Laboratory of Petroleum Resources and Prospecting (China University of Petroleum),
Beijing 102249, China;
2. College of Geophysics and Information Engineering, China University of Petroleum, Beijing 102249, China;
3. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China

Abstract:The root mean square (RMS) difference of time-lapse seismic amplitudes is routinely used to identify the substituted fluid type in a reservoir during oil field production and recovery. By a time-lapse seismic method, we study the effects of fluid substitution in a physical model, which is an analogy of the three-dimensional inhomogeneous reservoir. For a weak inhomogeneous medium, gas/oil substitution results in positive anomalies in the reservoir layers, and negative anomalies below the bottom of the reservoir layers; while water/oil substitution causes only weak variations in the reservoir layers, but positive anomalies below the bottom of the reservoir layers. For the strong inhomogeneous medium, no matter what kind of fluid substitution (gas/oil or water/oil), there are significant anomalies in seismic amplitude difference attributes both in and below the reservoir layers. Therefore, for weak inhomogeneous media, such as tight sandstone or thin interbedded layers, the RMS amplitude difference attributes can be used to monitor fluid changes and predict the drilling direction; for inhomogeneous medium with karst carves or fractures, it is difficult to accurately determine the distribution of fluids with the RMS amplitude difference attributes.

 

Key words: inhomogeneous medium; physical modeling; time-lapse seismic technique; fluid substitution effect; seismic attribute

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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