Open Access
ARTICLE
New Evaluation Method of Fracture Permeability Based on Stoneley Wave Data and Electric Imaging Log in Tight Fractured Sandstone Reservoir
Fuming Zhang1, Guangquan Zheng2, Yongping Wu2
1 SHAO Cairui, China University of Petroleum (East China).
2 CHEN Weizhong, Exploration and Development Research Institute of Tarim oilfield, China.
Structural Longevity 2013, 10(3), 167-176. https://doi.org/10.3970/sl.2013.010.167
Abstract
Quantitative evaluation of fracture permeability is one of difficulties
in log interpretation. In recent years, more and more well-logging new technology,
such as electrical imaging logging and array sonic logging were widely applied in
complex reservoirs evaluation, and also, provided great help in calculating fracture permeability. But, one of the most difficult questions in fracture permeability
modeling is how to acquire physical fracture permeability samples, which would
be used to calibrate the empirical model. Commonly, the physical fracture permeability samples can be gained from full diameter cores analysis, or interpretation
results from formation testing data. But unfortunately, this kind of samples are often very few because of the difficult of fractured full diameter cores analysis and
the lacking of testing data focalized fractured intervals. So, this paper put forward
a new idea or method to resolve this trouble, which may be called as Dual Calibration method. As we know, the permeability calculated from Stoneley wave (can be
called as Stoneley permeability) was total formation permeability, which consist of
matrix and fracture permeability. In no fracture intervals, the Stoneley permeability
should be equal to the matrix permeability, so we can calibrate the Stoneley permeability to matrix permeability, which gained from conventional core analysis or
matrix interpretation. In fractured intervals, fracture permeability can be computed
from the calibrated Stoneley permeability and the matrix permeability. Generally,
an empirical fracture permeability model can be established from fracture aperture and porosity, which often gained from electric imaging processing. So we can
calibrate this model by fracture permeability acquired from above steps and make
the model suit for the target areas. Namely, this idea can be simply described as:
the matrix permeability calibrated Stoneley wave permeability, and Stoneley wave
permeability calibrate the electric imaging fracture permeability. This method had
been used in some oilfields in Western China and good results were produced. In our opinions, this method could be regarded as an important supplement when we
gained the physical fracture permeability samples difficultly.
Cite This Article
Zhang, F., Zheng, G., Wu, Y. (2013). New Evaluation Method of Fracture Permeability Based on Stoneley Wave Data and Electric Imaging Log in Tight Fractured Sandstone Reservoir.
Structural Longevity, 10(3), 167–176.