砂岩储层中粘土矿物二次参数定量评价方法及其地质意义

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

随着油气田的二次、三次开采，人们愈来愈认识到了砂岩储层中粘土矿物的重要作用。如，高岭石的速流性、蒙脱石的水敏性、伊利石的丝缕化障积性、绿泥石的酸敏性等，具有这些特性的粘土矿物以不同的方式堵塞和填积在储层孔隙喉道中，影响油气开采的效益和开采所选的工艺。基于上述粘土矿物的特性，它们在储层中矿物组成和含量的不同将会影响储层物性的孔隙形态和渗透力的大小，也会影响油气资源评价的准确性。因此，本文提出用粘土矿物的组成、含量、砂岩孔隙度和渗透率的数学模型来定量评价储层物性．称之为储层粘土矿物二次参数评价方法。

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.