Well logging method for evaluating oiliness of reservoir by virtue of magnetic resonance imaging of drilling fluid

Abstract

The invention relates to the technical fields of exploration and development of petroleum and natural gas and particularly discloses a well logging method for evaluating the oiliness of a reservoir by virtue of magnetic resonance imaging of a drilling fluid. The method comprises the following steps: firstly detecting liquid hydrocarbon in the drilling fluid by virtue of a magnetic resonance imaging technique, so as to obtain oiliness data of the drilling fluid; and evaluating the oiliness of the reservoir by virtue of a curve intersection method or a chart method, and finally evaluating oil quality by virtue of a relation between crude oil density and transverse relaxation time. According to the method, the comprehensive evaluation on reservoir physical property, homogeneity, deposition characteristic, reservoir fluid property, oil abundance and oil quality is realized, the problem whether a fluid can be extracted from an evaluated reservoir and the problem about the properties of the fluid can be solved, and the oiliness of the reservoir is evaluated by virtue of multiple parameters of a logged well, so that the expression is visual, the applicability is strong, the exploration and development levels of rock waste and gas-survey weak-showing oil and gas resources are increased, and powerful support is provided for the exploration and development of unconventional oil and gas resources.

Description

technical field [0001] The invention relates to the technical field of petroleum and natural gas exploration and development, in particular to the technical field of drilling fluid analysis, in particular to a mud logging method for evaluating the oiliness of a reservoir by using drilling fluid nuclear magnetic resonance. Background technique [0002] The formation is composed of rock and pore fluid. After the oil and gas formation is drilled, part of it remains in the rock sample, and the other part enters the drilling fluid. Therefore, the drilling fluid as a "liquid core" contains very important formation fluid information. At present, oil and gas in rock samples and gas in drilling fluid have corresponding logging methods to detect, and there is a mature method for evaluating oiliness by using rock sample logging data, and gaseous hydrocarbons in drilling fluid also have corresponding methods. However, the use of liquid hydrocarbons in drilling fluids to evaluate reservo...

AI Technical Summary

Problems solved by technology

The above-mentioned prior art uses drilling fluid nuclear magnetic resonance data to realize the measurement of drilling fluid oil content. Comprehensive evaluation of oiliness such as abundance and oil quality

[0004] In short, in the prior art, only the quantitative detection of drilling fluid oil content can be realized by using drilling fluid NMR technology, but there is no systematic evaluation of oil content of reservoirs by using drilling fluid NMR technology, especially for unconventional reservoirs, weak Show oil and gas layers and heavy heavy oil, there is no complete evaluation method for oiliness

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