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T2-T1 two-dimensional intersection diagram-based four-gas reservoir fluid discrimination method

A technology of T2-T1, discrimination method, applied in earth-moving drilling, character and pattern recognition, wellbore/well components, etc., can solve problems such as insignificant difference between natural gas and movable water

Inactive Publication Date: 2019-08-23
SINOPEC SSC +1
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Problems solved by technology

This type of method is mainly based on T 2 Spectrum signal, in the application of Leisi gas reservoir with well-developed fractures and vugs, natural gas and movable water at T 2 There is no obvious difference in the spectrum, and there are certain limitations

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  • T2-T1 two-dimensional intersection diagram-based four-gas reservoir fluid discrimination method
  • T2-T1 two-dimensional intersection diagram-based four-gas reservoir fluid discrimination method
  • T2-T1 two-dimensional intersection diagram-based four-gas reservoir fluid discrimination method

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[0038]The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following description.

[0039] Such as Figure 8 As shown, the fluid discrimination method of Leisi gas reservoir based on the T2-T1 two-dimensional intersection map includes the following steps:

[0040] Step 1. Select the two-dimensional nuclear magnetic resonance GAS2D712 observation mode, and use the MRIL-P nuclear magnetic resonance logging tool to obtain the multi-waiting time T w The following echo train data; use the Fredholm integral equation of the echo amplitude to calculate the number of hydrogen nuclei f in the longitudinal and transverse relaxation times jr ; According to the measured drilling fluid performance, formation temperature and pressure and other parameters, finally get T 2 ,T 1 1D distribution spectrum, and 2D crossplot T 2 -T 1 .

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Abstract

The invention discloses a T2-T1 two-dimensional intersection diagram-based four-gas reservoir fluid discrimination method. The method comprises the following steps: step 1, selecting a two-dimensionalnuclear magnetic resonance GAS2D712 observation mode to obtain echo string data under multi-waiting time Tw; solving a hydrogen nuclear number fjr of longitudinal and transverse relaxation time; finally obtaining a T2, T1 one-dimensional distribution spectrum and a two-dimensional intersection diagram T2-T1; step 2, determining characteristic values and distribution intervals of fluids such as capillary bound water, movable water and methane gas by measuring nuclear magnetic resonance relaxation spectrums T2 and T1 of the rock core; and step 3, further analyzing the characteristics of the nuclear magnetic resonance relaxation spectrum, and determining the distribution positions and limit values of different fluids, especially movable water and natural gas signals. According to the invention, the characteristics and regularity of different fluids on a two-dimensional nuclear magnetic spectrum are found by utilizing the characteristic that the natural gas and the movable water have obvious difference in a nuclear magnetic resonance relaxation spectrum, especially a T1 spectrum, so that the fluid discrimination method suitable for the Sichuan-West four-gas reservoir is formed.

Description

technical field [0001] The invention relates to the field of oil and gas exploration, in particular to a fluid discrimination method for Leisi gas reservoir based on a T2-T1 two-dimensional intersection graph. Background technique [0002] At present, fluid identification methods based on conventional logging data such as normal probability analysis method, pore-saturation intersection method, porosity overlapping method, etc., methods based on dipole data such as Poisson’s ratio and volume compressibility method, P-s wave velocity ratio method etc.; but this type of method has obvious limitations when it is aimed at the Leisi gas reservoir in western Sichuan, that is, the karst fracture-cavity reservoir. Due to the strong heterogeneity of the formation, the gas-water boundary distribution in the vertical direction is not clear; and the conventional logging data is not only affected by pore fluid, but also affected by multiple factors such as rock skeleton composition, refle...

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Application Information

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IPC IPC(8): G06Q10/06G06Q50/02G06K9/00E21B49/00
CPCG06Q10/0639G06Q50/02E21B49/00G06F2218/12
Inventor 张正玉侯克均吴见萌葛祥缪祥禧张世懋王辛何传亮刘忠明李德才何林洋
Owner SINOPEC SSC
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