Quantitative Analysis Method of NMR Rock Oil Abundance in Oil Drilling

Abstract

The invention relates to a method for analyzing oil abundance of fine drilling cuttings by using nuclear magnetic resonance technology. The method includes debugging and calibrating the nuclear magnetic resonance analysis instrument; making the working curve of the oil abundance of the rock in the target layer, taking the cuttings of the reservoir without oil and gas in the target layer of the work area and the crude oil of the target layer, and preparing crude oil, rock A series of mixed samples of cuttings; soaked in a water-soluble paramagnetic ion solution; then carry out NMR analysis; draw a scatter diagram with the NMR signal intensity as the abscissa and the crude oil content of the sample as the ordinate, and obtain the NMR value according to the linear regression method. The correlation coefficient and correlation equation between resonance signal intensity and rock oil abundance are used to make a working curve of rock oil abundance in the target layer; and then the rock oil abundance data is obtained. This method can analyze drilling cuttings in real time, obtain rock oil abundance data in real time, achieve quantitative evaluation of reservoir oiliness, and provide technical support for oil exploration, development and production in real time.

Description

1. Technical field [0001] The invention relates to a method for analyzing the oil abundance of rocks in oil drilling, in particular to an analysis method for the oil abundance of fine drilling cuttings by using nuclear magnetic resonance technology. 2. Background technology [0002] Oil and gas reservoirs are the basic units of oil and gas accumulation on the earth's crust. The research on geological conditions for oil and gas reservoir formation mainly includes oil source layers (source rocks), oil and gas generation, oil and gas migration, reservoirs, cap rocks, traps, and preservation conditions. Among them, the research on reservoir is the core content of oil and gas reservoir research, and oil abundance is an important parameter for evaluating reservoir properties and calculating oil resources. [0003] Oil abundance refers to the weight (or volume) of crude oil contained in rock per unit weight (or volume), and the percentage (weight% or volume%) is often used to expre...

AI Technical Summary

Problems solved by technology

There are two traditional methods for obtaining oil abundance in petroleum drilling geology: (1) Laboratory analysis method: this method collects drilling core samples for analysis, and can obtain more accurate oil abundance parameters, but due to the lack of core sections for drilling , so the obtained oil abundance parameters are also discontinuous and limited; in addition, due to the long cycle of laboratory analysis, it is difficult to meet the production needs

(2) Geophysical logging interpretation method: This method uses geophysical logging (such as acoustic waves, neutrons, density, resistivity, etc.) data and empirical formulas to obtain continuous oil abundance parameters. The interpretation and evaluation of reservoir properties are very helpful, but there are still many technical difficulties in this method when interpreting special oil and gas reservoirs, and this method can only be obtained after the completion of drilling (or mid-drilling) and geophysical logging

The meaning of the rock cuttings oil abundance parameter detected by this method is the percentage of fluorescence area, not the weight % or volume % oil abundance parameter in the true sense, and the measurement data is not accurate and reliable enough

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