NMR T1-T2 Map of Different Hydrogen Contents of Bakken Formation

The development of shale reservoirs has interpreted as a milestone in the energy equation.This issue led to organicrich oil-producing mudrocks to be studied extensively during the last decade.Shale reservoirs properties such as pore size, organic matter, wettability, clay content and mineralogy would limit the application of the conventional methods for characterizing such reservoirs. Nuclear Magnetic Resonance (NMR) relaxation method is a crucial technique for evaluating shales rocks, both core and log scale.Utilizing NMR tool to measure relaxation times (ranging from 0.1-1 ms) provides a way to understand small pore sizes (nano-meter scale) and also to investigate different proton populations using 2D T1-T2 maps.We took some samples from upper and lower Bakken formation with different maturity levels.Then, the position of each proton population such as hydroxyls from the clay, water, kerogen, and hydrocarbon was detected in samples.Results showed, in a T1-T2 map, the position of these signatures do not overlap and also shows the movability of each portion as well.