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Method for calculating oil saturation of reservoir

A saturation and reservoir technology, applied in the direction of earthwork drilling and production, wellbore/well components, etc., can solve the problem of large calculation error of reservoir oil saturation and achieve high-precision results

Active Publication Date: 2014-07-23
PETROCHINA CO LTD
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Problems solved by technology

[0005] In view of the problems existing in the prior art, the purpose of the present invention is to provide a calculation method for determining the oil saturation of the reservoir to solve the large error in the calculation of the oil saturation of the low-porosity and low-permeability clastic rock reservoir in the prior art. Defects

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  • Method for calculating oil saturation of reservoir
  • Method for calculating oil saturation of reservoir
  • Method for calculating oil saturation of reservoir

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Embodiment

[0042] Step 1. According to the core and logging data of oil and gas reservoir sections, select representative core samples of low-porosity and low-permeability oil and gas layers, and conduct core porosity φ, nuclear magnetic resonance T 2 Spectrum and lithoelectric experiments;

[0043] In this embodiment, the oil and gas reservoir section of one oil field block and one layer is selected as the target layer to be studied, the core data and logging data of the target layer are collected, and representative rock core samples are selected according to these data 16 block (porosity between 5.2% and 15.3%, permeability between 0.05×10-3μm2 and 46.0×10-3μm2), in this example, the so-called representative core refers to the core in porosity, permeability The value of the ratio, as well as the type and characteristics of the pores should be representative; in accordance with the "Core Analysis Methods (SY / T5336-2006)", "Code for Laboratory Measurement of Rock Sample NMR Parameters (...

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Abstract

The invention discloses a method for calculating oil saturation of a reservoir. The method comprises the following steps of: establishing a reservoir oil saturation model including a free fluid porosity phi f, a bound fluid porosity phi b, as well as corresponding macropore bond index mf, micropore bond index mb and micropore bond index characteristic value bar{mb} parameters; measuring a core porosity phi of a selected core sample; carrying out a nuclear magnetic resonance T2 spectrum experiment and an electric petrophysical experiment on the selected core sample to determine the core porosity phi and bound water saturation Swir of the selected core sample, the free fluid porosity phi f and bound fluid porosity phi b, stratum water resistivity Rw of a saturated rock sample, saturated water rock resistivity Ro of each rock sample, and resistivity Rt of each rock under different conditions of water saturation Sw; determining parameters of a reservoir oil saturation model by adopting an optimization data fitting method; establishing a relationship between the core micropore bond index mb and the bound water saturation Swir; classifying reservoir cores according to the bound water saturation; and determining a saturation index n of each type of cores by using the optimization fitting algorithm.

Description

technical field [0001] The present invention relates to the technical field of logging evaluation of oil and gas reservoirs in petroleum exploration, in particular to a method for calculating oil saturation based on pore structure in logging evaluation of low-porosity and low-permeability clastic rock reservoirs, specifically a method for calculating oil saturation based on pore structure A calculation method for reservoir oil saturation. Background technique [0002] In oil exploration and development, the main task of well log interpretation is to identify and quantitatively evaluate oil and gas layers. Archie first proposed the relationship between resistivity and water saturation of oil and gas reservoirs, that is, the Archie formula, which laid the foundation for the calculation of reservoir saturation in oil and gas reservoirs and played an important role in logging evaluation. The classic Archie formula is mainly applicable to sandstone reservoirs with intergranular ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B49/00
Inventor 李霞李长喜李潮流刘忠华王昌学
Owner PETROCHINA CO LTD
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