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Method for logging well by saturability of C/H ratio to stratum fluid

A technology of formation fluid and saturation, which is applied in the logging and water field of judging oil, dry layer and water-flooded layer, and can solve problems such as difficulties in correct evaluation

Inactive Publication Date: 2002-11-27
王振信
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Currently used logging methods such as C / O, RST, and boron neutron lifetime cannot meet all the above requirements, and are affected and limited by various conditions to varying degrees, especially for the evaluation of water-flooded formations. It is more difficult to correctly evaluate reservoirs with low porosity, low permeability and low salinity

Method used

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  • Method for logging well by saturability of C/H ratio to stratum fluid
  • Method for logging well by saturability of C/H ratio to stratum fluid
  • Method for logging well by saturability of C/H ratio to stratum fluid

Examples

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example 1

[0075] Example 1 Well 7-23 (old well)

[0076] Reservoir characteristics: low porosity and ultra-low permeability, effective porosity of 10-13%, permeability of 6.2×10^-3um^2, serious heterogeneity in the layer, and salinity of 20,000 mg / I.

[0077] 2920-2950m: ΔCF>0, showing oil; its interpretation chart is right-sloping, showing the characteristics of oil layers;

[0078] ΔCF<0 in each layer below 3000m indicates water; the interpretation chart from 3000m to 3022m is obliquely T-shaped, showing the characteristics of flooding; the chart from 3022-3043m is flat-headed oblique T-shaped, showing the characteristics of waterflooding, which should be a strong flooding layer ( The bottom is pyroclastic rock).

[0079] layer number

example 2

[0080] Example 2 Well 6-32 (adjustment well)

[0081] The purpose of well logging is to divide the oil-water interface and identify the oil-water layer. The porosity of the well is 18-24%, the permeability is 30-50, and the salinity is 100,000-150,000 mg / l. (Cretaceous above 1870 meters, Jurassic below)

[0082] 1778.9-1783.5m: ΔCF > 0 indicates oiliness, and the chart is right-sloping, indicating oiliness. Quantitative interpretation of water saturation of 45.3% is oil layer. It is verified as an oil layer by oil testing;

[0083] 1795.8-1802.2m: ΔCF>0 showed oiliness, and the chart showed right-sloping oiliness, and the water saturation of 44.1% was quantitatively explained as oil layer. It is verified as an oil layer by oil testing;

[0084] 1804-1810.4m: ΔCF>0 is oily, and the plate is the same as above. Quantitative interpretation of water cut and 47% oil layer (tight layer at the bottom).

[0085] 1810.4-1830.8m: ΔCF<0 exhibits water, the plate is flat-headed and r...

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Abstract

A well logging method features that the abundances of C and H elements in stratum fluid are directly measured and the C / H ratio is used to qualitatively and quantitatively determine the saturability of oil-gas and the water flooding degree for recognizing oil-gas layer, water layer, dry layer and water flooding layer. Its advantages are wide application range and high effect.

Description

technical field [0001] The invention relates to the field of geophysical nuclear logging, in particular to a method that directly detects the abundance of hydrocarbon elements in the formation fluid, and quantitatively or qualitatively evaluates the oil content or remaining oil saturation of the reservoir based on the ratio CHR of the two and water flooding degree, the logging method for judging oil, water, dry layer and water flooded layer. Background technique [0002] In the process of oilfield exploration and development, in order to determine oil and gas producing layers, water layers and monitor the production dynamics of production layers, identify water flooded layers and judge the degree of water flooding, it is necessary to perform well logging on completed cased wells and production wells to correctly grasp The distribution of oil and gas layers, water layers and various dynamic parameters of production layers, so as to correctly formulate the development and prod...

Claims

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Application Information

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IPC IPC(8): G01V9/00
Inventor 王振信
Owner 王振信
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