Method for logging well by saturation of carbon hydrogen ratio to stratum fluid

A technology of formation fluid and saturation, applied in geophysical measurement, measuring equipment, nuclear radiation exploration, etc., can solve the problems that are not objectively expressed, the contribution of hydrocarbon energy window is small, and the contribution of carbon atoms is not expressed.

Active Publication Date: 2014-04-23
王振信
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  • Claims
  • Application Information

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Problems solved by technology

In the 1970s, "carbon-oxygen ratio logging" was introduced into China. Since most oilfields in my country are low-porosity and low-permeability reservoirs, the effect is not good due to the influence of porosity.
[0004] 2) "Compensated carbon-oxygen ratio energy spectrum" logging through tubing (referred to as "RST" logging), which is a so-called reservoir saturation logging developed from carbon-oxygen ratio. Due to the small diameter of downhole tools, It can be used to log in the production well through the tubing to quantitatively evaluate the remaining oil saturation and water flooding degree of the oil layer. It is suitable for the formation with a porosity greater than 20%, but due to the limitation of low porosity and the influence of many factors, the effect is also not good
[0008] The applicant once applied for a patent in 2002, and the patent application number 02004486.9 discloses a logging method for formation fluid saturation of carbon-hydrogen ratio, but wherein: 1) "carbon-hydrogen atomic number ratio response equation" only expresses pure The ratio of carbon and hydrogen atoms in sandstone reservoirs does not express the contribution of carbon atoms in calcium carbonate cement, and does not accurately and objectively reflect the ratio of carbon and hydrogen atoms in real forma

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  • Method for logging well by saturation of carbon hydrogen ratio to stratum fluid
  • Method for logging well by saturation of carbon hydrogen ratio to stratum fluid
  • Method for logging well by saturation of carbon hydrogen ratio to stratum fluid

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Embodiment 1

[0099] see Figure 1-Figure 7 As shown, this embodiment provides a C / H ratio formation fluid saturation logging method, which uses the detection of the C / H element abundance in the formation fluid, and uses the C / H ratio after double normalization connection based on the ratio of the two to use It is used to quantitatively evaluate the oil saturation of the reservoir and the distribution of remaining oil, the water-flooded degree and water content of the oil layer, and judge the oil and gas, water, dry layer and water-flooded layer; the effective porosity of the reservoir in Well 65 is 9-17%, and the Triassic Conglomerate reservoirs, with a calcium carbonate content of about 15%, are severely heterogeneous and micro-fractures and vertical fractures are developed. Use the method provided in this example to understand the remaining oil saturation of each layer and the degree of water flooding in the oil layer, in order to adjust the production The program provides data basis; th...

Embodiment 2

[0126] Present embodiment adopts the method described in the present invention to be No. 608 wells evaluation residual oil saturation, provides data basis for water plugging; ppm) is sodium chloride type, Cretaceous oil reservoir, perforated well section: 1792.5-1808m., water content 97% before logging.

[0127] According to the method provided by the present invention, its logging results are obtained as shown in Figure 8, and its interpretation conclusions are as follows: 1, 3 layers are oil-bearing dry layers; 2 layers are 44% irreducible water saturation, 45% water saturation, movable Oil reservoir with 25% oil saturation and 0% water cut; 4 layers with irreducible water saturation of 48%, water saturation of 62%, movable oil saturation of 8%, and water cut of 64%; 5 layers with irreducible water saturation 36%, 68% water saturation, 2% movable oil saturation, and 94% water content; 6 layers are water layers with 38% irreducible water saturation, 86% water saturation, and ...

Embodiment 3

[0130] In order to better reflect the advantages of the method described in the present invention, the present embodiment now provides the comparison and analysis of four oil wells shown in Table 8 and Table 9 for oil testing, sealed coring wells and FCH interpretation results:

[0131] Table 8 FCH interpretation, oil testing conclusion, core oil saturation comparison table

[0132]

[0133] Table 9 Results of FCH logging interpretation, oil testing and sealed coring in Well XX

[0134]

[0135] It can be seen from Table 8 and Table 9 that:

[0136] 1) The FCH (CHR) logging interpretation conclusion is consistent with the oil testing conclusion, with a coincidence rate of 100%;

[0137] 2) FCH interpretation and test oil water content (Fw) standard error Fw ≤ ± 10%, the coincidence rate is 100%, if the error standard Fw ≤ ± 5%, 8 layers are consistent, the coincidence rate is 88.8%;

[0138] 3) The comparison results of the FCH interpretation conclusion and the analysi...

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Abstract

The invention discloses a method for logging well by saturation of a carbon hydrogen ratio to a stratum fluid. The method comprises the following steps of (1) recording on-site data; (2) and analyzing the data, including (a) correcting the depth and dividing a lithologic profile, (b) establishing a "carbon hydrogen ratio interpretation model" having an oil layer water logging degree standard interpretation chart and selecting carbon hydrogen ratio interpretation parameters CHRw and the maximum value CHRmax, (c) establishing a carbon hydrogen ratio interpretation parameter card, (d) solving water saturation, oil saturation, water content and oil displacement efficiency, (e) evaluating oil or remaining oil saturation, movable oil saturation and oil layer water logging degree of a reservoir stratum, and (f) making out a result map and interpreting an analysis report. According to the method, abundance of carbon and hydrogen elements in the stratum fluid is detected, double unification connection is carried out based on the ratio of the carbon element to the hydrogen element, and the oil saturation, the oil layer water logging degree and the water content of the reservoir stratum are subjected to full quantitative evaluation, so that accuracy of the data is improved, the application effect is improved remarkably, and the application range is expanded.

Description

technical field [0001] The invention relates to the field of geophysical nuclear logging, in particular to a method of directly detecting the abundance of carbon and hydrogen elements in formation fluids, and based on the ratio of the two, CHR, to fully quantitatively evaluate the oil content or remaining oil saturation of reservoirs and Water flooded degree of oil layer, logging method for judging oil, water, dry layer and water flooded degree of oil layer. technical background [0002] In the process of oilfield exploration and development, it is urgent to evaluate the oil-bearing or remaining oil saturation, the water flooding degree of the oil layer and the distribution of remaining oil, so as to provide data basis for the design and adjustment of the oilfield development plan. The logging methods currently used for the above purpose are as follows Several: [0003] 1) "Carbon-oxygen ratio energy spectrum logging" (referred to as C / O logging), which detects the abundanc...

Claims

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Application Information

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IPC IPC(8): G01V5/04G01V5/10
Inventor 王振信
Owner 王振信
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