US 9,176,081 B2 · NMR analysis of unconventional reservoir rock samples

Abstract

Systems and methods for magic angle spinning nuclear magnetic resonance analysis of samples from unconventional reservoirs are described. Fast and inexpensive methods are described that can provide reliable information on TOC content, type, and maturity (via the relative abundances of different hydrocarbons, for example) without the need for more extensive sample preparation or destruction. If care is taken during sample recovery and storage, NMR can also yield an estimate of gas-in-place, including detailed typing (e.g. methane vs. ethane). The described MAS NMR analysis is used to determine various properties of unconventional reservoirs, including gas and oil shales, which are useful in evaluating their worth and producibility.

Claims19

Dependent claims

A method of analyzing rock samples from a subterranean hydrocarbon reservoir comprising:

performing magic angle spinning nuclear magnetic resonance spectroscopy on a sample of rock from an unconventional hydrocarbon reservoir wherein the magic angle spinning nuclear magnetic resonance spectroscopy includes pulse field gradient nuclear magnetic resonance spectroscopy;
determining one or more characteristics associated with said sample of rock based at least in part on said magic angle spinning nuclear magnetic resonance spectroscopy;
and
wherein the one or more characteristics include measurements of one or more types selected from a group consisting of:
total organic carbon content, total organic carbon type, hydrocarbon saturation, water saturation, wettability, intralayer water, interlayer water, hydraulic conductivity, hydraulic porosity, and gas type.

2 more elements

Dependencies are inferred from the claim text.

NMR analysis of unconventional reservoir rock samples

Life of this patent

NMR analysis of unconventional reservoir rock samples

Life of this patent

Abstract

Claims19