METHOD FOR EVALUATING EVOLUTION OF DIFFERENT TYPES OF PORES IN SHALE

摘要

Disclosed is a method for evaluating evolution of different types of pores in shale. The method is applied in the field of unconventional oil and gas research. With the increasing of shale burial depth or maturity, all kinds of pores, including intergranular pores, Intragranular pores and organic pores and cracks, which are all developed in the shale are constantly changed, such that the storage amount of shale oil and gas is greatly influenced. According to the high resolution electronic scanning electron microscopy image of the shale, on the basis of building the classification standard and pore identification of different types of pores in the shale, surface porosities of different types of pores are respectively extracted, and are used, in combination with the total volume of the pores acquired through data from low temperature N ₂ and CO ₂ adsorption experiments and high pressure mercury experiments, to build an evolution map of various kinds of pores. The method has an important application value for unconventional shale oil and gas resource exploration.