DIGITAL PETROPHYSICS AND STANDARD LABORATORY METHODS FOR DETERMINING TERRIGENOUS CONTAINER ROCKS CAPACITIVE PROPERTIES

摘要

At the moment, the actual direction in the chain of petrophysical drill sample analysis is an approach called "Digital core-sample" or "Digital petrophysics". However, the majority of Russian oil and gas industry companies prefer traditional methods of laboratory analysis, due to the lack of information about the possibilities of this approach. Comparative characteristics of the established laboratory methods effectiveness for determining terrigenous container rocks’ capacitive properties (Nuclear Magnetic Resonance, Preobrazhensky method; Gas Volumetric method) with the method of computer microtomography (micro-CT). Getting recommendations in the selection of test methods of open porosity evaluation in non-standard collectors – with low filtration properties to 1 mD and containing high-viscosity oils and bitumen. The open porosity (FVF) in helium was determined by the "Coretestsystems" company permeameter-porosimeter AR-608; FVF was determined by a Nuclear Magnetic Resonance (NMR) – Spectrometer Chromatec 20M, manufactured by ZAO SKB "Chromatec"; by Preobrazhensky method – according to the procedure, in the laboratory. FVF was determined by micro-CT method of "Bruker microCT" company’s microtomograph – SkyScan 1172. Comparative analysis of methods for determining container rocks’ capacitive properties has shown that standard laboratory techniques: Preobrazhensky method, Gas Volumetric Method are affordable, effective and simple. However, in the case of determining of open porosity in low-permeability container rocks containing highviscosity oil qualitative sample preparation cannot be conducted. As a result, the FVF values are underestimated. The most effective methods in the unconventional container rocks’ analysis are Nuclear Magnetic Resonance and computer microtomography. In case of a clay material high content in the container rocks, the nuclear magnetic resonance method does not give reliable results. This is confirmed by modern Russian scientists and present experimental work.