The invention discloses a method for determining reservoir permeability, and belongs to the field of reservoir evaluation The method comprises: firstly performing a physical property experiment, a nuclear magnetism T2 experiment and a mercury penetration experiment on a rock core; then utilizing the mercury penetration experiment data to establish a pore-throat dividing boundary, and utilizing the correlated relation between the mercury penetration experiment data and the nuclear magnetism T2 experiment data to establish different pore distribution boundaries; then extracting different pore components; and finally calculating the reservoir permeability The method is a method of performing permeability calculation for a low porosity and permeability reservoir based on combinations of different hole components, the method is capable of accurately reliably acquiring the permeability, and provides reliable reservoir parameters for exploration of our country large-area low porosity and permeability reservoirs and exploitation and evaluation of oil reservoirs

Method for determining reservoir permeability

The invention provides a method for judging the wettability of a reservoir rock. The method comprises the following steps of: measuring free relaxation time of oil and water respectively; measuring transverse relaxation time of the oil and the water in saturated states respectively; measuring a nuclear magnetic resonance signal of the reservoir rock in the co-presence of an oil phase and a water phase by using nuclear magnetic resonance technology and recording an oil saturation value and a water saturation value in the co-presence of the oil phase and the water phase; dipping the rock core of the reservoir rock in the co-presence of the oil phase and the water phase in more than or equal to 20,000 ppm paramagnetic solution, waiting for at least 48 hours and separating the nuclear magnetic resonance signal of the reservoir rock in the co-presence of the oil phase and the water phase to obtain the transverse relaxation time of the oil and the water reflecting the size of an oil wet area and a water wet area; and calculating a wettability index in the co-presence of the oil phase and the water phase according to the free relaxation time of the oil and the water, the transverse relaxation time of the oil and the water in the saturated states, the transverse relaxation time of the oil and the water, the oil saturation value and the water saturation value so as to judge the wettability of the reservoir rock.

Method for judging wettability of reservoir rock

The invention relates to an on-line testing device for high temperature and high pressure rock physical property and percolation mechanism nuclear magnetic resonance. The on-line testing device comprises a nuclear magnetic resonance on-line testing module, a rock fluid displacement module (comprising core holder compatible with nuclear magnetic resonance tests) and a computer control and data processing module, a nuclear magnetic resonance testing system and a rock fluid displacement system are combined into a whole through computer control, formation temperature and pressure are simulated, rock displacement tests are carried out under high temperature and high pressure conditions, and real-time nuclear magnetic resonance signals are measured on line to obtain rich rock parameters (porosity, permeability, reservoir forming critical pressure, wettability and the like). The on-line testing device serves as a device for oil gas reservoir forming geological research and oil gas target assessment, and the purposes of analyzing core physical properties and percolation mechanism from micro perspective are achieved.

On-line testing device for high temperature and high pressure rock physical property and percolation mechanism nuclear magnetic resonance

The present invention relates to a constant gradient field nuclear magnetic resonance (NMR) rock sample analysis method and instrument. The method includes: in a constant gradient magnetic field, performing NMR measurement to acquire data; converting the measured NMR data into a two-dimensional NMR spectrum D-T 2 ; performing measurement and inversion on a standard sample of a constant gradient field to obtain a standard sample two-dimensional NMR spectrum D-T 2 ; measuring the sample to acquire a two-dimensional NMR spectrum D-T 2 of a fluid in the sample; identifying fluid types according to the practically measured two-dimensional NMR spectrum D-T 2 ; computing the fluid property and the petrophysical parameters according to the two-dimensional NMR spectrum D-T 2 of the fluid in the sample; performing single slice scanning on the sample to acquire partial oil and water saturation; performing continuous slice scanning to obtain axial oil and water saturation distribution and movable fluid saturation distribution of the sample.

Nuclear magnetic resonance rock sample analysis method and instrument with constant gradient field

The invention discloses a rock heterogeneous quantitative evaluation method based on magnetic resonance imaging. Three-dimensional space orientation of rock can be realized by layer selection pulse, phase coded pulse and frequency coded pulse. An imaging signal can be obtained by applying a spin-echo sequence, and optimization selection of imaging experimental parameters can be carried out through experimental scale. On the basis, a nuclear magnetic imaging signal obtained by experimental measurement is subjected to digital image processing so as to generate a pseudo color graph. By means of the relationship between the porosity and nuclear magnetic imaging signal intensity of a stand sample, the total porosity and porosity and distribution spectrum of a single layer can be obtained. Multi-layer imaging results are compared and a porosity heterogeneous coefficient is defined, so that the longitudinal porosity distribution characteristic and heterogeneity of rock can be obtained. In addition, by applying a first-order spherical variation function model and a grid search method, characteristic parameters of a variation function can be obtained. Heterogeneous coefficients and relative heterogeneous coefficients can be defined to realize longitudinal and horizontal heterogeneous quantitative characterization of rock.

Rock heterogeneous quantitative evaluation method based on magnetic resonance imaging

The invention discloses a rock nuclear magnetic resonance relaxation signal measuring device of formation rock matter property, which comprises the following parts: magnet, probe, preposition amplifier, power amplifier, nuclear magnetic resonance controller and control computer, wherein the nuclear magnetic resonance controller generates specific frequency and waveshape radio frequency actuation impulse, which is sent to the nuclear magnetic resonance probe in the magnet after magnified; the rock sample is set in the exciting probe, which generates nuclear magnetic resonance backward wave signal; the nuclear magnetic resonance probe receives the backward wave signal and sends to the nuclear magnetic resonance controller after magnified, which is sent to the computer finally. The invention can generate the parameter for usage directly, which can be applied in the oil field nuclear magnetic resonance well.

Apparatus and method for measuring stratum rock physical property by rock NMR relaxation signal

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Apparatus and method for measuring stratum rock physical property by rock NMR relaxation signal