Method for determining carbonate reservoir porosity cutoff

A carbonate rock reservoir, porosity technology, used in earth-moving drilling, suspension and porous material analysis, wellbore/well components, etc., can solve problems such as inability to meet requirements

Inactive Publication Date: 2015-07-29
SOUTHWEST PETROLEUM ENG CO LTD SINOPEC
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Problems solved by technology

With the continuous improvement of oil and gas exploration, the accuracy of the lower limit of industrial physical properties of effective reservoir recovery is getting higher and higher. The existin

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  • Method for determining carbonate reservoir porosity cutoff
  • Method for determining carbonate reservoir porosity cutoff
  • Method for determining carbonate reservoir porosity cutoff

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Embodiment Construction

[0022] The present invention will be described below in conjunction with specific embodiments.

[0023] X carbonate reservoir in DZ Oilfield has strong heterogeneity. According to the statistics of 1702 core sample points, X carbonate reservoir has an average porosity of 8.859% and an average permeability of 3.291mD, which is an ultra-low porosity and low permeability reservoir. .

[0024] S1. Obtain the total porosity of the formation PORT=POR+POR sh ×V sh , where POR is the effective porosity, POR sh is the mudstone porosity, V sh is the clay content, D. wet is the density value of mudstone saturated with irreducible water, D f is the fluid density value, D dry is the density value of dry mudstone, the D dry According to the ratio of Th and K obtained by natural gamma ray spectrum logging, the composition of clay minerals is analyzed, and the appropriate theoretical density value is selected as the density of dry clay, that is, the density of dry mudstone. The D we...

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Abstract

The invention belongs to the field of oil and gas exploration and development, in particular to a method for determining carbonate reservoir porosity cutoff. By the aid of total water saturation SWT and mudstone bound water saturation SWB, accuracy of calculation results is dependent on selection of Ddry and Dwet key parameters, mineral components are analyzed according to TH and K ratios to serve as a selection basis of a dry clay density value, and a pure shale layer with regular boreholes and stable lithology, thickness and log response serves as a wet mudstone density value. The reservoir porosity cutoff is determined according to the relationship between cumulative oil and gas volume and porosity. The method is more accurate as compared with a method for calculating water saturation by a volume model to obtain reservoir oil and gas saturation. The components of clay minerals are analyzed according to the TH and K ratios obtained by natural gamma ray spectrum logging, a proper theoretical density value is selected as the dry clay density value, namely dry mudstone density, data can be more directly acquired, and final results are real and reliable.

Description

technical field [0001] The invention belongs to the field of petroleum and natural gas exploration and development, in particular to a method for determining the lower limit of the porosity of carbonate reservoirs. Background technique [0002] The determination of the lower limit of reservoir physical properties is an important factor affecting the calculation results of reserves, a key issue directly related to exploration and development decision-making, and one of the difficulties in reservoir research at present. The physical parameters commonly used to describe reservoirs include porosity, permeability, water saturation, throat radius, etc. Among them, porosity has the advantages of being intuitive and easy to determine. Therefore, the lower limit of porosity is generally used to characterize the lower limit of physical properties of reservoirs. Carbonate reservoirs are quite different from conventional clastic reservoirs in terms of pore structure and geophysical resp...

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Application Information

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IPC IPC(8): E21B49/00G01N15/08
CPCE21B49/00
Inventor 吴见萌张筠陈必孝葛祥
Owner SOUTHWEST PETROLEUM ENG CO LTD SINOPEC
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