Method for calculating porosities of inorganic substances in shale reservoir by adoption of logging curves, method for calculating total porosity in shale reservoir by adoption of logging curves and method for calculating components in shale reservoir by adoption of logging curves

A technology for shale reservoirs and logging curves, which is used in calculations, earth-moving drilling, wellbore/well components, etc. It can solve the problem of complex pore types and fluid occurrence forms, hindering the popularization and application of logging interpretation methods, and inability to describe Differences in shale composition and other issues

Active Publication Date: 2017-09-22
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the mineral composition, pore type and fluid occurrence form of shale gas reservoirs are complex, which are quite different from conventional gas reservoirs.
If the logging interpretation model of conventional sandstone gas reservoirs is copied, the composition difference between shale and conventional sandstone reservoirs cannot be described, which hinders the popularization and application of logging interpretation methods based on volume models

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  • Method for calculating porosities of inorganic substances in shale reservoir by adoption of logging curves, method for calculating total porosity in shale reservoir by adoption of logging curves and method for calculating components in shale reservoir by adoption of logging curves
  • Method for calculating porosities of inorganic substances in shale reservoir by adoption of logging curves, method for calculating total porosity in shale reservoir by adoption of logging curves and method for calculating components in shale reservoir by adoption of logging curves
  • Method for calculating porosities of inorganic substances in shale reservoir by adoption of logging curves, method for calculating total porosity in shale reservoir by adoption of logging curves and method for calculating components in shale reservoir by adoption of logging curves

Examples

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Embodiment 1

[0056] A method for calculating the porosity of inorganic matter in shale reservoirs using well log curves, comprising:

[0057] (1) Introduce assumptions: shale reservoirs are composed of inorganic matter and organic matter; the pores of organic matter only contain gas, and the porosity of organic matter is a constant value; the pores of inorganic matter only contain water; the particle density of shale reservoirs is Value.

[0058] (2) Determine the volume model of the shale reservoir according to the composition of the shale reservoir.

[0059] The volume model of the shale reservoir is:

[0060] V pm +V pk = 1 formula (1);

[0061] V pm =V pm φ pm +V sm =V pm φ pm +V pm (1-φ pm ) formula (2);

[0062] V pk =V pk φ pk +V sk =V pk φ pk +V pk (1-φ pk ) formula (3);

[0063] Where: V pk is the percentage of organic matter volume in the total shale volume; V pm is the percentage of the volume of inorganic matter in the total volume of shale; φ pm is the...

Embodiment 2

[0082] A method for calculating the inorganic porosity, total porosity and components in shale reservoirs using well logging curves in this embodiment is the same as the method for calculating inorganic porosity in shale reservoirs using well logging curves in Example 1 , total porosity and composition methods are basically the same, the difference is that this embodiment is aimed at indoor conditions, ρ sm , ρ pmfl , ρ sk , ρ pkfl 、DT sm 、DT pmfl 、DT sk 、DT pkfl , φ pk These nine parameters are difficult to determine directly.

[0083] On the basis of Example 1, Example 2 also adds the following steps: when using the uncertain ρ sm , ρ pmfl , ρ sk , ρ pkfl 、DT sm 、DT pmfl 、DT sk 、DT pkfl , φ pk When the porosity is obtained by parameter calculation, the porosity test of the shale reservoir core is completed indoors first, and the core is homing. Then take the porosity value obtained from the indoor test as a benchmark for comparison, and use the optimization ...

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Abstract

The invention discloses a method for calculating porosities of inorganic substances in a shale reservoir by adoption of logging curves, a method for calculating a total porosity in shale reservoir by adoption of the logging curves and a method for calculating components in the shale reservoir by adoption of the logging curves, and relates to the technical field of geology. The method for calculating porosities of inorganic substances in shale reservoirs by adoption of logging curves comprises the following steps of: importing an assumed condition; determining a volume model of a shale reservoir according to components of the shale reservoir; and determining an inorganic substance porosity calculation model according to a relationship among an acoustic logging curve, a density logging curve and the components of the shale reservoir and the volume model of the shale reservoir. The method for calculating the components in the shale reservoir by adoption of logging curves comprises a step of calculating the proportion of each component in the shale reservoir by utilizing the calculated porosities of the inorganic substrates and the relationship among the acoustic logging curve, the density logging curve and the components of the shale reservoir. The method for calculating the total porosity in the shale reservoir by adoption of the logging curves comprises a step of calculating the total porosity in the shale reservoir by utilizing the calculated proportion of each component in the shale reservoir and the calculated porosities of the inorganic substances.

Description

technical field [0001] The invention relates to the technical field of geology, and in particular to a method for calculating inorganic matter porosity, total porosity and components in shale reservoirs by using logging curves. Background technique [0002] The rock structure composition of shale reservoirs generally includes: organic components, inorganic components and various pore spaces, and the inorganic components include clay mineral components and non-clay mineral components. Shale reservoirs contain more organic matter (kerogen) than conventional reservoirs. There is free natural gas in the pores of organic matter (kerogen), and a large amount of natural gas is adsorbed on the surface of kerogen. At present, in the conventional logging interpretation of conventional sandstone gas reservoirs in China, the volume model is constructed first, and then the porosity logging curve and the resistivity logging curve are used for interpretation. However, the mineral composi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50E21B49/00
CPCE21B49/00G06F30/20
Inventor 周文杨宇陈文玲刘鸿博周秋媚
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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