Method for obtaining logging saturation of low porosity permeability reservoir

A saturation, low porosity and permeability technology, applied in the field of exploration and development of oil and gas fields, can solve problems such as ineffective methods, large differences, and high costs, and achieve the effects of accurate and reliable research conclusions, increased coincidence rate, and good application value

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

The study of Archie's formula with variable m value is technically reasonable for logging interpretation of volcanic rocks with variable lithology or material composition, but the difficulty of obtaining m value affects the implementation of this method

Method used

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  • Method for obtaining logging saturation of low porosity permeability reservoir
  • Method for obtaining logging saturation of low porosity permeability reservoir
  • Method for obtaining logging saturation of low porosity permeability reservoir

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Embodiment Construction

[0031] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0032] The m value (dimensionless) in Archie's formula is a comprehensive reflection of lithology and pore structure. When applying Archie's formula to calculate the water saturation of low porosity and permeability reservoirs, it is difficult to accurately obtain the m value of volcanic rock reservoirs by using rock electrical experiments. In the case of changing characteristics of m value, according to the resistivity logging curve can comprehensively reflect lithology and pore structure, the functional relationship between resistivity and variable m value is established, and then it is substituted into Archie's formula to calculate the reservoir gas saturation degree (in the reservoir, the default water saturation plus gas saturation is 100%, the Archie formula calculates the water saturation, and 100% minus the water saturation is the gas saturation.), rea...

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Abstract

The invention provides a method for obtaining a logging saturation of a low porosity permeability reservoir, belonging to the technical field of exploration and development of oil and gas fields. The method comprises the following steps: firstly, determining bond indexes m in the reservoir, which are corresponding to different resistivities, then building functional relationships between the resistivities and the bond indexes m, and finally obtaining an approximate solution of the gas saturation of the reservoir to further obtain a correct judgement on the type of the reservoir. The invention solves the current situation that the m variable calculated by the rock electrical experiment is difficult to guide the production application, and logging recognition problems of the air layer, the air and water layer and the water layer in the low porosity permeability reservoir. The method disclosed in the invention has a strong operability and research conclusion thereof is accurate and reliable. The method also raises the accordance rate of logging interpretation for the volcanic reservoir, and has excellent application values on the tight sand rock, the carbonate rock and the igneous rock reservoirs.

Description

technical field [0001] The invention belongs to the field of exploration and development of oil and gas fields, and in particular relates to a method for obtaining logging saturation of low porosity and permeability reservoirs. Background technique [0002] In oil and gas field exploration and development, using Archie's formula to calculate reservoir water saturation is a key technology for judging reservoir fluid properties and accurately identifying gas layers, gas-water layers, water layers, and dry layers. Archie's formula is: [0003] [0004] In the formula, a and b are coefficients related to formation factors and resistivity increase rate; [0005] m is the cementation index; [0006] n is the saturation index; [0007] Rw is formation water resistivity; [0008] φ is the log porosity; [0009] Rt is the true resistivity of formation; [0010] Sw is the water saturation. [0011] Archie's formula contains m, a, n, and b to be determined interpretation para...

Claims

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Application Information

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IPC IPC(8): E21B49/00E21B47/00
Inventor 李浩刘传喜郑荣臣冯琼
Owner CHINA PETROLEUM & CHEM CORP
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