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Calcium content correction-based tight sandstone gas saturation calculation method

A technology of tight sandstone and calculation method, which is applied in the direction of electric/magnetic detection, measuring device, earth cube drilling and production for well logging records, can solve the problems of electrical conductivity error and other problems, and achieve high precision, good correlation and good The effect of applying the effect

Inactive Publication Date: 2019-12-10
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

Therefore, the Archie formula has limitations and errors in reflecting the conductivity characteristics in tight sandstone formations

Method used

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  • Calcium content correction-based tight sandstone gas saturation calculation method
  • Calcium content correction-based tight sandstone gas saturation calculation method
  • Calcium content correction-based tight sandstone gas saturation calculation method

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Embodiment

[0089] This embodiment illustrates this method through a practical application, specifically:

[0090] Step 1, select the wells that have been continuously sealed and cored from top to bottom in the area where the gas saturation is to be calculated. In the X117 well selected in this embodiment, cores at different coring depths and different lithologies are selected according to the "Core Analytical method SY / T5345-2007 "Standard stipulates that core porosity, permeability, and water saturation are measured to obtain core porosity, permeability, and water saturation at different depths, and prepare data for subsequent fine processing of saturation .

[0091] Step 2: Use the well X108 well in the research block to measure the element logging data, and use the formation element oxygen closure model to process and obtain the calcareous weight percentage of the tight sandstone reservoir, and the formation element oxygen closure model:

[0092]

[0093] Among them, Y i is the f...

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Abstract

The invention discloses a calcium content correction-based tight sandstone gas saturation calculation method, which comprises the following steps: according to logging data, combining a stratum element oxygen closed model to obtain the calcium weight percentage content of a tight sandstone reservoir; obtaining the porosity of the tight sandstone reservoir by adopting a tight sandstone multi-mineral rock skeleton model according to the logging information; obtaining the corresponding relation between the formation resistivity increasing factor of the whole tight sandstone reservoir and the calcium weight percentage content of the tight sandstone reservoir through prior region analysis, and correcting the formation resistivity through the formation resistivity increasing factor to obtain thecorrected formation resistivity; and obtaining the gas saturation of the tight sandstone according to the corrected formation resistivity and the porosity of the tight sandstone reservoir. The obtained gas saturation of the reservoir has good correlation with saturation data of closed coring analysis, the gas saturation of the tight sandstone is accurately calculated through logging data, the precision is high, the application effect is good, and reference is provided for saturation evaluation of the tight sandstone reservoir.

Description

technical field [0001] The invention belongs to the technical field of logging evaluation of tight sandstone reservoirs in petroleum exploration, and relates to a method for calculating gas saturation of tight sandstone based on calcium content correction. Background technique [0002] Quantitative evaluation of saturation parameters of unconventional tight sandstone reservoirs is the focus and difficulty of reservoir logging evaluation. At present, based on the conductivity mechanism of argillaceous sandstone, the saturation is continuously and quantitatively calculated mainly by using the resistivity logging curve. However, saturation is a crucial parameter in tight sandstone gas reservoirs, because the research on the relative permeability of coring sections in tight sandstone gas reservoirs shows that its water saturation affects the effective permeability of reservoirs to a certain extent. In order to deeply study the conductive mechanism of tight sandstone and establi...

Claims

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Application Information

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IPC IPC(8): G01V3/18G01V3/38E21B49/00
CPCE21B49/00G01V3/18G01V3/38
Inventor 袁龙令狐松李国利吴思仪高衍武王谦韩闯鲁明宇虞兵陈强刘春雷姚亚彬陈玉林唐瑜
Owner BC P INC CHINA NAT PETROLEUM CORP
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