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A method for quickly identifying low-resistivity oil and gas layers by optimizing drilling mud

A technology for drilling mud and oil and gas layers is applied in the field of oil exploration and development of oil and gas reservoir identification, and can solve the problems of not obtaining low-resistance annulus, inability to guarantee low-resistance oil and gas layers with low-resistance annulus, and high cost of nuclear magnetic resonance logging methods, To achieve the effect of reducing exploration and development costs, saving exploration costs, and improving recovery rates

Active Publication Date: 2015-10-21
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the identification method of this kind of low-resistivity oil and gas layers can be identified by nuclear magnetic resonance logging method, but the cost of nuclear magnetic resonance logging method is high, and not every well can measure nuclear magnetic resonance logging; If there is a low-resistivity ring zone, it can be judged that there is oil and gas, but it cannot be guaranteed that there is a low-resistivity ring zone in all such low-resistivity oil and gas layers.
Therefore, the existing technology only qualitatively identifies the low-resistance ring zone, but does not obtain the conditions for the formation of the low-resistance ring zone

Method used

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  • A method for quickly identifying low-resistivity oil and gas layers by optimizing drilling mud
  • A method for quickly identifying low-resistivity oil and gas layers by optimizing drilling mud
  • A method for quickly identifying low-resistivity oil and gas layers by optimizing drilling mud

Examples

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Effect test

Embodiment 1

[0063] Example 1: Identification of low-resistivity oil and gas reservoirs in mature areas

[0064] A well is located in an old exploration block, and the deep detection resistivity value is very low, the resistivity value is less than 1.5Ω·m, and the low resistivity is caused by high salinity, which is a typical low-resistivity oil and gas reservoir caused by high salinity. The irreducible water saturation of the core is 31.6%, and the residual oil saturation is 20%. According to the calculation in the content of the invention, the condition for forming a low-resistance ring zone is R mf >5.5R w . Formation water analysis reports that the formation water resistivity is 0.034Ω·m, and the actual drilling mud resistivity is 0.45Ω·m, then the mud resistivity R mf and formation water resistivity R w The satisfying relation between is: R mf =13.2Rw, which far satisfies the condition of forming a low-resistance ring. Therefore, low-resistivity rings will inevitably appear in th...

Embodiment 2

[0065] Example 2: Discovery of low-resistivity oil and gas reservoirs in new areas

[0066] The resistivity value of the reservoir in a certain well is lower than that of the upper and lower surrounding rocks, which belongs to the low-resistivity oil-gas layer with lower resistivity than the surrounding rocks. It is difficult to identify the oil-water layer, and no explanation has been made before this layer. Inductive logging of parameters such as high frequency in array induction shows that the resistivity of the flushing zone is 10Ω·m, and the resistivity of the formation is 8Ω·m. The resistivity of the flushing zone is greater than that of the formation. However, the resistivity of the intrusion zone is 6.5Ω·m, and the resistivity of the intrusion zone is the lowest, indicating that a low-resistance ring zone is formed in the formation, and the reservoir contains oil and gas, which is interpreted as oil and water in the same layer by comprehensive analysis. The test confir...

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Abstract

The invention belongs to a method for recognizing oil and gas reservoirs in oil exploration and development and particularly relates to a method for fast recognizing a low-resistivity zone through optimizing drilling mud to determine oil content. The method includes optimizing drilling mud parameters according to drilling coring materials in a zone to be detected and earth's surface physical materials, establishing evaluation to form a drilling mud resistivity model of the low-resistivity zone; and detecting the drilling mud resistivity value of the zone to be detected and recognizing the process of the low-resistivity oil and gas reservoirs through combining the model, wherein Rmf>KRw in the drilling mud resistivity model. By means of the method, the recognition rate of the low-resistivity oil and gas reservoirs can be improved, therefore the exploitation rate of the low-resistivity oil and gas reservoirs can be improved, and exploratory and development costs can be reduced.

Description

technical field [0001] The invention belongs to a method for identifying oil and gas reservoirs in petroleum exploration and development. In particular, it relates to a method for optimizing the drilling mud so that a low-resistance ring zone is formed in the detection target area, and then the oil-bearing method is judged. Background technique [0002] There are many low-resistivity oil and gas layers in my country, and most of them are low-resistivity oil and gas layers caused by high salinity formation water. It is difficult to identify enemy resistivity oil and gas layers in the exploration process, and it is necessary to increase core analysis, imaging logging and nuclear magnetic resonance logging. Wells and other high-tech identification directly increase the cost of exploration and cause leakage of low-resistivity oil and gas layers. [0003] The low-resistance ring refers to the resistivity of the flushing zone, transition zone and undisturbed formation in the reser...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B49/00
Inventor 廖东良陆黄生赵文杰王卫
Owner CHINA PETROLEUM & CHEM CORP
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