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Method for confirming fluid density and solid skeletal density

A technology of fluid density and skeleton density, applied in seismology, measuring devices, instruments, etc. for logging records

Inactive Publication Date: 2012-05-16
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, determining the fluid density and rock solid skeleton density of the reservoir is very useful for the qualitative and quantitative analysis of oil and gas reservoirs, but there is no method in the prior art that can quickly determine the fluid density and rock solid skeleton density of the reservoir effective method

Method used

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  • Method for confirming fluid density and solid skeletal density
  • Method for confirming fluid density and solid skeletal density
  • Method for confirming fluid density and solid skeletal density

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Embodiment Construction

[0015] In the following, firstly, the principle of the present invention will be described in combination with the dual-phase medium theory.

[0016] According to the two-phase medium theory, the density of oil and gas reservoirs depends on the density of the solid framework of rocks in the reservoir and the density of fluid in the pores of rocks in the reservoir. Let the reservoir density be ρ, then

[0017]

[0018] where ρ s is the solid skeleton density in the reservoir, ρ f is the fluid density in the reservoir rock pores, is the porosity.

[0019] Assuming that the rock skeleton density and fluid density in a section of reservoir are constant, then for n sample points of this section of reservoir, there are:

[0020]

[0021] (2)

[0022] m

[0023]

[0024] If the reservoir density ρ and porosity As known, when n>2, formula (2) can be regarded as an overdetermined equations. It can be obtained by the method of least squares:

[0025]

[0026] in...

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Abstract

The invention provides a method for determining a fluid density and a solid skeletal density in a storage layer, and determining the fluid density and the solid skeletal density of a three dimensional area. The method for determining the fluid density in the storage layer comprises the steps of: collecting logging data aiming at the storage layer; obtaining storage layer density data rho i and porosity data phi i at each sampling point of n sampling points in the storage layer from the logging data aiming at the storage layer, wherein i = 1, 2, ..., n; and determining the fluid density rho f in the storage layer through a formula. Through the method provided by the invention, the fluid density and the solid skeletal density in the storage layer can be determined by using the density data and the porosity data of the storage layer obtained by the logging data; the fluid density and the solid skeletal density can be spread to the whole three dimensional data space through a nonlinear inversion method in combination with a three dimensional seismic data volume; and the three dimensional space data obtained through inversion can be used for storage layer forecasting, gas and water identification, oil and gas accumulation description and the like.

Description

technical field [0001] The invention relates to the field of seismic exploration, in particular to a method for determining fluid density and a method for determining solid skeleton density for oil and gas reservoirs. Background technique [0002] At present, with the development of lithologic oil and gas reservoir exploration technology, many geophysicists are looking for methods that can be used to directly detect underground oil and gas reservoirs, thereby reducing the risk of oil and gas exploration and greatly improving the success rate of oil and gas exploration . Fluid density is a key parameter that can be used to directly search for oil and gas in seismic exploration, and it is the most direct evidence reflecting fluid properties. [0003] In actual formations, especially in economically significant reservoirs, most rocks contain pores, which in turn contain fluids. The fluid density of the reservoir is the combined effect of the density of various fluid substance...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N9/00G01V1/40
Inventor 李曙光牛滨华徐天吉唐建明胡斌孔选林蔡军兰丁蔚楠姜镭胡治权李显贵
Owner CHINA PETROLEUM & CHEM CORP
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