Riverway microfacies depicting method for glutenite oil reservoirs

A glutenite and channel technology, applied in the field of petroleum exploration, can solve problems such as inaccurate description of sedimentary microfacies, and achieve the effect of improving accuracy

Inactive Publication Date: 2021-01-05
CHINA PETROLEUM & CHEM CORP +1
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of this application is to provide a channel microfacies characterization method for glu...

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  • Riverway microfacies depicting method for glutenite oil reservoirs
  • Riverway microfacies depicting method for glutenite oil reservoirs
  • Riverway microfacies depicting method for glutenite oil reservoirs

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Embodiment Construction

[0025] Due to the complexity of sandy conglomerate reservoirs, it is difficult to identify reservoirs. Identifying channel microfacies in favorable facies belts can effectively improve the degree of reserves production.

[0026] The following will be described with examples. A method for characterizing channel microfacies of glutenite reservoirs, the steps are as follows:

[0027] 1. Determine the sedimentary system, and then determine the types of sedimentary microfacies and logging facies:

[0028] 1.1. First, determine the sedimentary system, that is, on the basis of previous studies, determine the sedimentary system in the target area through core observation, analysis of laboratory data analysis and seismic feature research.

[0029] For example, for the target interval X in a certain target area, core observation shows that the color of the mudstone (or conglomerate) in the oil-bearing interval of the target area gradually becomes darker from the boundary fault to the n...

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Abstract

The invention relates to a riverway microfacies depicting method for glutenite oil reservoirs. The method comprises the following steps: determining a target area sedimentary system, and further determining a sedimentary microfacies type and a logging facies type; counting the sand body thicknesses of different single layers of the drilled well in the target area, and drawing a sand body thicknesscontour map by utilizing an interpolation method; counting sand-land ratio values of different single layers of the drilled well in the target area, and drawing a sand-land ratio contour map by utilizing the interpolation method, wherein the sand-land ratio value is the ratio of the thickness of the sand body to the thickness of the stratum; establishing a corresponding relationship between logging facies and geological facies of different single-layer sedimentary microfacies to obtain a logging facies map; and superposing the sand body thickness contour map, the sand-land ratio contour map and the logging facies map to obtain planar distribution of each single-layer river channel microfacies. The method has the beneficial effects that the sand body thickness contour map, the sand land ratio contour map and the logging facies plane distribution map are superposed, the riverway microfacies are comprehensively depicted, and the depicting accuracy is greatly improved.

Description

technical field [0001] The invention relates to the technical field of petroleum exploration, in particular to a channel microfacies characterization method of glutenite oil reservoirs. Background technique [0002] Glutenite reservoirs generally have the characteristics of fast reservoir lithology changes, large physical property changes, and strong reservoir heterogeneity, making it difficult to identify effective reservoirs. Production practice shows that channel microfacies reservoirs have good physical properties, high oil accumulation per well, and good development effect. Therefore, under the current low oil price, for sandy conglomerate reservoirs, identifying favorable areas as early as possible can improve work efficiency and lay a foundation for oil fields to stabilize production and obtain oil. [0003] There have been many studies on the characterization of channel microfacies. The traditional technical means are considered from a relatively single factor: on t...

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Application Information

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IPC IPC(8): G01V11/00
CPCG01V11/00
Inventor 李会娟刘斌李洪生李岩胡书奎方越钟玉龙李远光王芳王琪龙卫江
Owner CHINA PETROLEUM & CHEM CORP
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