Quantitative Evaluation and Geological Significance of Secondary Parameters of Clay Minerals in Sandstone Reservoir

Key words: 
• Sandstone reservoir /
• Secondary Parameters of clay minerals /
• Mathematical model /
• Quantitative evaluation

Abstract: It is realized that clay minerals in sandstone reservoir have important effect with the second, and the third exploitation of oil and gas fields. For instance, Kaolinite has the property of rapid flow, and montmorillonite of water-sensitive, illite of resistance, but chlorite has the property of acid-sensitive.They fill in the throats of pore through different ways and affect the beneficial result and the technology of oil and gas exploitation. These properties and the differences in composition and content of the clay minerals will influence the pores shape and percolating force, as well as the accurate appreciation of oil and gas resources. Therefore, a mathematical model that was built by using the composition, content, porosity and permeability of the clay minerals is adopted within this paper to evaluate the sandstone reservoir quantitatively. This method is called the evaluation of the secondary parameters of the clay minerals.