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Method for obtaining sandstone brine layer potassium ion content by means of logging information

A technology for logging data and potassium ions, which is applied in the field of obtaining potassium ion content in sandstone brine layers from natural gamma energy spectrum logging data

Active Publication Date: 2013-10-09
EXPLORATION & DEV RES INST OFSINOPEC JIANGHAN OILFIELD +1
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Problems solved by technology

At present, there is no calculation method for calculating the content of trace elements including potassium ions in the brine layer from geophysical logging data

Method used

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  • Method for obtaining sandstone brine layer potassium ion content by means of logging information
  • Method for obtaining sandstone brine layer potassium ion content by means of logging information
  • Method for obtaining sandstone brine layer potassium ion content by means of logging information

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Embodiment Construction

[0053] In order to better understand the present invention, the content of the present invention is further illustrated below in conjunction with the examples, but the content of the present invention is not limited to the following examples.

[0054] The 3909.4-3911.8m and 3916.0-3922.4m wells of Senior 1 are a sandstone brine layer (see attached figure 2 ), the time difference between the two layers of sound waves is 213-227μs / m, and the density is 2.52-2.45g / cm 3 . Select the density to calculate the porosity, and calculate the shale content V sh The average is 0.15, the average porosity is 9.6% and 9.8% (see the table below), and the salinity calculated by resistivity is 253.22g / L; image 3 ) to calculate the density of the brine layer, and obtain the density of the brine layer to be 1.153g / cm 3 ; the potassium skeleton value K of the sandstone ma =1.05%, potassium measurement K of mudstone sh =3.2%, using the above formula to calculate the potassium ion volume conte...

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Abstract

The invention relates to evaluation of the brine grade in underground brine exploration and development, in particular to a method for obtaining the sandstone brine layer potassium ion content by means of natural gamma-ray logging. The method comprises the following steps that 1) geophysical well logging is carried out on a stratum to be explained, and the geophysical well logging comprises lithological class logging, physical property class logging and natural gamma-ray spectra logging; 2) a sandstone layer and pure mudstone are divided, shaliness Vsh of the sandstone layer is evaluated; 3) porosity phi of the sandstone layer is calculated, and the sandstone brine layer and a dry sand layer are divided; 4) the sandstone brine layer potassium total content K, the potassium content Ksh of the pure mudstone near the sandstone brine layer, and the potassium content Kma of the dry sand layer near the sandstone brine layer are obtained by means of natural gamma-ray logging information; 5) the potassium ion mass concentration of the sandstone brine layer is evaluated. The method is a brand new method for evaluating the potassium ion content in deep well brine, precision is high, and well logging interpretation requirements of the potassium ion content are met.

Description

technical field [0001] The invention belongs to the field of geological exploration, and relates to the evaluation of brine grade in underground brine exploration and development, in particular to a method for obtaining potassium ion content of sandstone brine layer by using natural gamma energy spectrum logging data. Background technique [0002] In the exploration and development of underground brine, after the formation is drilled, use the data obtained from well logging to interpret the brine layer and evaluate the grade of brine (the degree of salinity and the content of trace elements), which is an important work in the next step of water testing. At present, the use of logging data to classify sandstone-type water layers is very mature, including the use of natural potential (SP), natural gamma ray (GR), borehole diameter (CAL), photoelectric absorption cross-section index (PE) and other lithologic logging data to classify The sandstone layer is then divided into wate...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V11/00G01N33/00
Inventor 黄华张士万余嫦娥张连元
Owner EXPLORATION & DEV RES INST OFSINOPEC JIANGHAN OILFIELD
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