Methods of determining shale pore connectivity

A method of estimating pore connectivity in a shale formation, comprising:

• treating a first shale sample from the shale formation by:
• immersing the first shale sample in a brine solution for a first predetermined duration, and measuring a first NMR T2 spectrum of the first shale sample after immersion in the brine solution, and
• immersing the first shale sample in a liquid hydrocarbon for a second predetermined duration, and measuring a second NMR T2 spectrum of the first shale sample after immersion in the liquid hydrocarbon;
• treating a second shale sample from the shale formation by:
• immersing the second shale sample in the liquid hydrocarbon for a third predetermined duration, and measuring a first NMR T2 spectrum of the second shale sample after immersion in the liquid hydrocarbon, and
• immersing the second shale sample in the brine solution for a fourth predetermined duration, and measuring a second NMR T2 spectrum of the second shale sample after immersion in the brine solution;
• and
• estimating (1) an organic pore connectivity of the shale formation by evaluating the first NMR T2 spectrum of the first shale sample and the second NMR T2 spectrum of the first shale sample, and (2) an inorganic pore connectivity of the shale formation by evaluating the first NMR T2 spectrum of the second shale sample, and the second NMR T2 spectrum of the second shale sample.