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Method solving argillaceous sandstone reservoir stratum water resistivity and rock-electro parameter

A technology of formation water resistivity and argillaceous sandstone, which is applied in electric/magnetic exploration, electric/magnetic detection for logging records, water resources assessment, etc. Not applicable to problems such as shaly sandstone reservoirs, to achieve the effect of improving calculation accuracy

Active Publication Date: 2017-11-07
CHINA NAT OFFSHORE OIL CORP +1
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Problems solved by technology

However, in actual production practice, technicians found that the method of determining rock electrical parameters and formation water resistivity through experimental data takes a long time, which does not meet the needs of rapid interpretation and evaluation on site; while the Pickett chart can quickly calculate formation water resistivity , but not suitable for shaly sandstone reservoirs

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  • Method solving argillaceous sandstone reservoir stratum water resistivity and rock-electro parameter
  • Method solving argillaceous sandstone reservoir stratum water resistivity and rock-electro parameter
  • Method solving argillaceous sandstone reservoir stratum water resistivity and rock-electro parameter

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Embodiment Construction

[0015] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with specific implementation manners.

[0016] A method for obtaining formation water resistivity and rock-electricity parameters of argillaceous sandstone reservoirs described in this embodiment includes the following steps:

[0017] Step 1: Find a water layer with a water saturation of 100% through the logging curve (lithology, electrical properties, physical properties), and read the resistivity Rt of the layer;

[0018] Step 2: Calculate the shale content Vsh of the water layer through the lithology curve (GR, SP curve), and calculate the porosity φ of the water layer through the physical property curve (DEN, CNL, AC curve);

[0019] Step 3: Given the product of lithology index and formation water resistivity aRw and the initial value of cementation index m as 2 and 4 respectively, calculate the shale correction item Ash with this...

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Abstract

The invention provides a method solving argillaceous sandstone reservoir stratum water resistivity and rock-electro parameters; the method can use the iteration method to fast solve the rock-electro parameters a, m and the stratum water resistivity Rw; only a water layer with the water saturation of 100% is given, and the iteration method can more accurately solve the stratum water resistivity and rock-electro parameters; a conventional Pickett plate cannot be used for solving the argillaceous sandstone reservoir stratum water resistivity, the method can solve said problems, can help to prospect a well, can fast calculate the development well water saturation, thus improving the water saturation calculating precision.

Description

technical field [0001] The invention relates to the technical field of geophysical well logging, in particular to a method for obtaining formation water resistivity and rock electric parameters of argillaceous sandstone reservoirs. Background technique [0002] In the process of oil and gas field logging evaluation, the accurate calculation of rock electrical parameters and formation water resistivity is the key to the accuracy of water saturation calculation. At present, the method of obtaining rock electrical parameters is mainly obtained through coring rock electrical experiments, and the method of obtaining formation water resistivity is mainly determined through water analysis data. In 1966, Pickett proposed the classic Pickett chart. It only needs to find a pure water layer with a water saturation of 100%, and the formation water resistivity and rock-electric parameters can be calculated on the resistivity-porosity double-logarithmic coordinate axis. However, in actua...

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Application Information

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IPC IPC(8): G01V3/18G01V3/38
CPCG01V3/18G01V3/38Y02A90/30
Inventor 何胜林张恒荣丁磊胡向阳刘土亮
Owner CHINA NAT OFFSHORE OIL CORP