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Gas layer and water layer recognition method for low-porosity and low-permeability reservoir

An identification method and reservoir technology, applied in earthwork drilling, measurement, wellbore/well components, etc., can solve problems such as the difficulty of distinguishing gas and water in the same layer, and achieve easy implementation, strong operability, and strong operability Effect

Active Publication Date: 2012-05-16
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

For formations with complex lithology, there is currently no suitable relationship between ΦN and ΦD to identify water layers, and it is even more difficult to identify gas-water layers

Method used

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  • Gas layer and water layer recognition method for low-porosity and low-permeability reservoir
  • Gas layer and water layer recognition method for low-porosity and low-permeability reservoir
  • Gas layer and water layer recognition method for low-porosity and low-permeability reservoir

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Embodiment Construction

[0027] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0028] Both the measurement of the porosity logging tool and the statistical error of the model have a non-negligible impact on the identification of fluids in low-porosity and low-permeability gas reservoirs. The gas layer fluid identification method of the present invention is based on the measurement principle of porosity logging, and studies the influencing factors that affect the value of the logging porosity curve. For the gas layer in the low-permeability reservoir, reconstruct the gas-bearing identification combination curve to minimize the environmental impact, and realize the orderly rearrangement of porosity in the gas layer; for the water layer in the low-porosity and low-permeability reservoir, consider the mud filtrate The effect of salinity on neutron porosity, summarizing the method of judging the water layer when ΦN>ΦD phenomenon occurs in th...

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Abstract

The invention provides a gas layer and water layer recognition method for a low-porosity and low-permeability reservoir, belonging to the field of oil exploration and development. According to the porosity logging measurement principle, through analyzing factors affecting the logging porosity curve value, the method for recognizing gas layer and water layer in high-salinity mud filtrate and low-porosity and low-permeability gas reservoir is provided by the invention. The gas layer and water layer recognition method based on a low-porosity and low-permeability reservoir provided by the invention is easy to implement, has high operability and is intuitive and clear in recognition; the accuracy of gas layer fluid recognition can be improved greatly while the cost is lowered by utilizing the method provided by the invention; and the method has a wide application range in field practice, and the method has great operability for either low-porosity and low-permeability volcanic rocks or carbonate and sand shale.

Description

technical field [0001] The invention belongs to the field of petroleum exploration and development, and relates to a logging technology for identifying reservoir fluids, in particular to a method for identifying gas and water layers suitable for low-porosity and low-permeability reservoirs. Background technique [0002] In gas reservoirs, using conventional logging curves to identify fluids is a commonly used logging method in the process of petroleum exploration and development. Because it is intuitive, rapid and low-cost to identify fluids, it is a must-have logging curve for every well. It has a wide range of applications in practical field applications. Usually, the hydrogen concentration of natural gas is so low that the gas-bearing pore volume is not enough to account for the influence of natural gas as the rock framework, that is, the natural gas pore volume has a lower ability to slow down fast neutrons than the limestone framework, which will be shown as negative ...

Claims

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Application Information

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IPC IPC(8): E21B47/00E21B49/00
Inventor 李浩魏修平
Owner CHINA PETROLEUM & CHEM CORP
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