Models For Headspace Isotope Compositional Analysis: Gas In Place, Permeability And Porosity Prediction And Completions Planning

摘要

Tight gas and oil storage is different from conventional where a majority of oil and gas are stored in nanometer sized pores (nanopores). Therefore the nanofludics, i.e. nanometer scale capillary sealing and opening in nanopores of tight rocks, plays a key role in overpressure conservation and storage of oil and gas, and also the fracking process involves the opening of the nano pore capillary seals through rock-fluid interactions. Through models presented here, cuttings/cores’ headspace Stable Isotope Analysis (CHSIA) provides an effective way to calculate the pore throat size and distributions much like BET experiment, and it could also provide information about the original pore pressure or gas in place. The rock-fluid nanofluidics interactions during fracking could also be studied through CHSIA and the results could help the optimization of fracking designs.