Affiliation:
1. School of Earth Sciences and Engineering Hohai University Nanjing 211100 China hhu.edu.cn
2. National Institute of Oceanography and Applied Geophysics (OGS) Trieste Italy
3. Hochschule Bochum Am Hochschulcampus 1 D-44801 Bochum Germany
4. Fraunhofer IEG (Institution for Energy Infrastructures and Geothermal Energy) Am Hochschulcampus 1 44801 Bochum Germany
5. Institute of Geology Mineralogy and Geophysics Ruhr-University Bochum Universitätsstrasse 150 44801 Bochum Germany ruhr-uni-bochum.de
Abstract
Abstract
Tight-oil reservoirs have low porosity and permeability, with microcracks, high clay content, and a complex structure resulting in strong heterogeneities and poor connectivity. Thus, it is a challenge to characterize this type of reservoir with a single geophysical methodology. We propose a dual-porosity-clay parallel network to establish an electrical model and the Hashin-Shtrikman and differential effective medium equations to model the elastic properties. Using these two models, we compute the rock properties as a function of saturation, clay content, and total and microcrack porosities. Moreover, a 3D elastic-electrical template, based on resistivity, acoustic impedance, and Poisson’s ratio, is built. Well-log data is used to calibrate the template. We collect rock samples and log data (from two wells) from the Songliao Basin (China) and analyze their microstructures by scanning electron microscopy. Then, we study the effects of porosity and clay content on the elastic and electrical properties and obtain a good agreement between the predictions, log interpretation, and actual production reports.
Funder
Jiangsu Province Science Fund for Distinguished Young Scholars
National Science and Technology Major Project of China
Fundamental Research Funds for the Central Universities
Postgraduate Research & Practice Innovation Program of Jiangsu Province
National Natural Science Foundation of China
Cited by
12 articles.
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