西南石油大学学报(自然科学版)

Previous Articles     Next Articles

Fracture Prediction in Tight Sandstone Reservoir with Curvature Method

Li Zhijun1,2, Zhang Ying1,2, Dou Yu3, Li Xiaogang1,2   

  1. 1. School of Petroleum Engineering,Chongqing University of Science & Technology,Shapingba,Chongqing 401331,China
    2. Chongqing Key Laboratory of Complicated Oil & Gas Exploration and Development,Shapingba,Chongqing 401331,China
    3. College of Earth Sciences,Guilin University of Technology,Guilin,Guangxi 541004,China
  • Online:2013-12-01 Published:2013-12-01

Abstract:

In view of the tight sand fractures with its relatively strong heterogeneity and the problem difficult to prediction,the
distribution prediction of natural fractures in tight and low permeability sandstone was discussed. In this paper,taking the S32
reservoir as an example in the ZZ Oilfield,the curvature method was used to predict fracture distribution law for target strata
by means of establishing 4 different curvature models,using 4 different calculating methods including spline function,trend
surface fitting,three-point circular arc,and calculus of differences,respectively. The calculation results by the 4 methods have
good positive correlations with open flow capacity in gas well testing in this study area,indicating that curvature method can
be used to predict the subsurface fracture distribution range. Among them,spline function shows the best prediction results.
therefore,the spline function curvature method has good application prospects in our study area.

Key words: curvature method, tight sandstone reservoir, fracture prediction, spline function, open flow capacity