Recognition method of properties of complex reservoir stratum fluid in different mud systems

A technology for reservoir fluid properties and identification methods, which is applied in the field of reservoir fluid property identification under different mud systems, and can solve the problems of not considering mud resistivity, relative amplitude influence, unseen, etc.

Inactive Publication Date: 2016-05-04
XI'AN PETROLEUM UNIVERSITY
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Problems solved by technology

Likewise, the relative magnitude of spontaneous potential logs is still affected by mud resistivity
Therefore, fully considering the influence of the mud system on the spontaneous potential amplitude difference, and then identifying the fluid properties of complex reservoirs under different mud systems has not yet been seen.
[0003] Judging from the existing methods, there is no reservoir fluid property identification method that considers the influence of mud resistivity on the spontaneous potential amplitude difference, which brings inconvenience to the identification of reservoir fluid properties by the natural potential method in different mud systems

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  • Recognition method of properties of complex reservoir stratum fluid in different mud systems
  • Recognition method of properties of complex reservoir stratum fluid in different mud systems
  • Recognition method of properties of complex reservoir stratum fluid in different mud systems

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Embodiment Construction

[0038] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0039] refer to figure 1 , a method for identifying fluid properties in complex reservoirs under different mud systems, comprising the following steps:

[0040] Step 1. Analysis of the mud system in the work area: Taking a certain work area as an example, make detailed statistics on the salinity of the mud used by each well in the work area to drill the target layer. After determining the temperature of the target layer through the geothermal gradient, after the salinity, The temperature and resistivity conversion chart is used to obtain the mud resistivity of the drilling target layer. Depend on figure 2 It can be seen that the mud resistivity in this work area varies greatly, ranging from 0.3 to 3.1Ω.m, and the mud resistivity of the target layer drilled has a large difference. There are both salt water mud and fresh water mud, which be...

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Abstract

Provided is a recognition method of properties of complex reservoir stratum fluid in different mud systems. Based on the natural potential, resistivity logging data and sonic time difference calculation porosity, the ratio of a natural potential amplitude difference to mud resistivity and an apparent formation water resistivity crossplot are established through combination of mud resistivity and formation water resistivity in an industrial region and rock-electro parameters, the properties of fluid in complex reservoir stratums in different mud systems in the industrial region are recognized through the plot, and technological support of logging will be provided for improving the recognition precision of a low oil-resisting layer and a high water-resisting layer. The natural potential amplitude difference and a mud resistivity parameter are organically combined, a new path is provided for recognizing the low oil-resisting layer and the high water-resisting layer, and the problem that the fluid properties are recognized just through resistivity logging is also avoided.

Description

technical field [0001] The invention belongs to the technical field of logging interpretation in petroleum exploration and development, in particular to a method for identifying reservoir fluid properties under different mud systems. Background technique [0002] In order to effectively identify the fluid properties of complex reservoirs under different mud systems in multi-well logging interpretation, accurately identifying the fluid properties of reservoirs is an important task for calculating oil and gas reserves and formulating development plans. In the existing identification methods of reservoir fluid properties, methods such as resistivity overlap or porosity-resistivity intersection at different detection depths are often used. Among the many factors that affect the accurate identification of reservoir fluid properties, mud system is one of the most important. factor. For example, under the same invasion conditions, the mud resistivity is low, and the measured resis...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/08
CPCE21B49/087
Inventor 刘之的刘桂珍李盼
Owner XI'AN PETROLEUM UNIVERSITY
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