Method and Device for Obtaining Microscopic Occurrence Characteristics of Oil Stored in a Shale

A device comprising:

• a non-transitory memory storage comprising instructions;
• and
• one or more processors in communication with the memory storage, wherein the instructions, when executed by the one or more processors, cause the device to:
• collect experiment data in a N-Hexane vapor adsorption experiment on a sample made from a shale, wherein the experiment data comprises a plurality of adsorbed amounts of N-Hexane absorbed by the sample under a plurality of pressures of N-Hexane vapor, and the plurality of adsorbed amounts of N-Hexane corresponds one-to-one to the plurality of pressures of N-Hexane vapor;
• calculate and obtain a plurality of adsorbed oil film thicknesses in the shale according to the plurality of adsorbed amounts of N-Hexane, wherein the plurality of adsorbed oil film thicknesses corresponds one-to-one to the plurality of adsorbed amounts of N-Hexane, an absorbed oil film thickness of the plurality of absorbed oil film thicknesses being an average thickness of oil films adsorbed on walls of pores in the shale;
• calculate a plurality of valid diameter values under the plurality of pressures of N-Hexane vapor according to a first relationship between a N-Hexane vapor pressure and a diameter value of a valid pore, wherein the valid pore is a pore in the shale with a capability of storing oil under the N-Hexane vapor pressure, and the diameter value of the valid pore is a distance between a center of the valid pore and a center of a molecular of a plurality of molecules that enclose and form the valid pore;
• and
• obtain an oil distribution in the shale according to the plurality of adsorbed amounts of N-Hexane and the plurality of valid diameter values, the oil distribution in the shale being a distribution of oil within pores of different sizes in the shale.

A non-transitory computer readable storage medium storing a computer executable program, wherein when the computer executable program is executed by a processor, a method is performed, and the method comprises:

• a first step:
• performing a N-Hexane vapor adsorption experiment on a sample made from a shale and collecting a plurality of adsorbed amounts of N-Hexane absorbed by the sample under a plurality of pressures of N-Hexane vapor, wherein the plurality of adsorbed amounts of N-Hexane corresponds one-to-one to the plurality of pressures of N-Hexane vapor;
• a second step:
• calculating and obtaining a plurality of adsorbed oil film thicknesses in the shale according to the plurality of adsorbed amounts of N-Hexane collected in the first step, wherein the plurality of adsorbed oil film thicknesses corresponds one-to-one to the plurality of adsorbed amounts of N-Hexane, an absorbed oil film thickness of the plurality of absorbed oil film thicknesses being an average thickness of oil films adsorbed on walls of pores in the shale;
• a third step:
• calculating a plurality of valid diameter values under the plurality of pressures of N-Hexane vapor according to a first relationship between a N-Hexane vapor pressure and a diameter value of a valid pore, wherein the valid pore is a pore in the shale with a capability of storing oil under the N-Hexane vapor pressure, and the diameter value of the valid pore is a distance between a center of the valid pore and a center of a molecular of a plurality of molecules that enclose and form the valid pore;
• and
• a fourth step:
• obtaining an oil distribution in the shale according to the plurality of adsorbed amounts of N-Hexane collected in the first step and the plurality of valid diameter values calculated in the third step, the oil distribution in the shale being a distribution of oil within pores of different sizes in the shale.