Numerical Research On The Transport Of Particle In Pore Media Of Digital Core With Micron X-ray CT

Heterogeneity and anisotropy play significant roles in describing reservoir formation.As a new technology in oilfield,digital core has great prospects in the simulation of researching the reservoir characteristics.At present,most numerical simulations based on digital core only consider the separation of matrix and pore,instead of the mineral components which is very important in the research on pore structure with nuclear detection.We tentatively put forward a new method to reconstruct the digital core based on micron X-ray CT,which can consider not only the three-dimensional pore structure but also the material components.Due to the macroscopic reaction cross section difference of rock matrix and pore-filling fluid for thermal neutron,we simulate thermal neutrons transporting through the digital core,meanwhile detect those unreacted thermal neutrons by array detector on the end side of model.The results show that when thermal neutrons transport along different directions of the core,all the simulated data are consistent with the pore’s distribution.Moreover,the effect from the anisotropy of the core is verified to be unserious.Furthermore,we tentatively analyzed the material composition of the core according to the simulation results.And finally,we also analyzed the best resolution of our array detectors and the suitable number of thermal neutrons emitted in every simulation.