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Logging distinguishing method of fault structure

A fault and well logging technology, applied in the direction of earthwork drilling and production, wellbore/well components, etc., can solve the problems of time-consuming and costly imaging logging, lack of economical and effective methods for downhole fault structures, and difficulty in coring, etc., so as to facilitate popularization , Promote the effect of in-depth exploration and development

Active Publication Date: 2014-10-01
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

However, imaging logging is time-consuming and expensive. For drilling safety, wells are usually located away from large faults, which makes it difficult to coring wells that pass through faults.
Therefore, there has been a lack of cost-effective methods for downhole fault structures

Method used

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  • Logging distinguishing method of fault structure

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Experimental program
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specific Embodiment approach

[0039] A logging identification method for a fault structure, the specific steps are as follows:

[0040] Step 1: Determine the location of the target well drilling breakpoint

[0041] Select a seismic section through the candidate well L24, determine the location of the breakpoint through fault interpretation and synthetic seismic records, read the travel time of seismic waves at the breakpoint, and determine the depth of the breakpoint through the time-depth conversion table in this area (see figure 2 ).

[0042] Step 2: Qualitative identification of fault structures

[0043] In the absence of imaging logging and core data, the logging response characteristics of each structural unit in the fault zone are determined through lateral correlation of adjacent wells and vertical correlation of single wells.

[0044] (1) Lateral comparison of adjacent wells

[0045] Select a well near the target well that is not fractured. Since the two wells have similar structures and sedime...

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Abstract

The invention relates to a method for recognizing a geologic phenomenon, in particular to a logging distinguishing method of a fault structure. According to the technical thought and the method, conventional logging is used as a major measure, information such as earthquake and well log is integrated for fast and effectively recognizing the underground fault structure. The method comprises the following steps that: on the basis of determining the fault positions, the logging information differences are utilized for carrying out adjacent well horizontal comparison and target well longitudinal comparison, and the fault structure is qualitatively divided; on the basis of the qualitative division results, points are selected at equal intervals at induced fracture zones of a hanging wall and a footwall of the fault structure, crushed zones and surrounding rock for carrying out effective logging information data reading; and a crossplot is drawn for quantitatively recognizing the fault structure, and effective verification is carried out. The method provided by the invention has the characteristics of economy, reliability and high efficiency, can be conveniently popularized in a fracture development zone in a large range, and has a positive effect on prompting the further exploration and development of oil fields.

Description

technical field [0001] The invention relates to an identification method of geological phenomena, in particular to a well logging identification method of a fault structure. Background technique [0002] A fault is not a simple two-dimensional surface, but a geological body with a complex internal structure. According to the differences in lithology, structure, and physical properties of different parts of the fault, it can be divided into different structural units. [0003] As an important channel for oil and gas migration, faults have the duality of opening and closing. People have always paid great attention to them in the practice of oil and gas exploration. Research on the system and other aspects has achieved fruitful results. [0004] Silje S. Berg et al., through field observation of normal faults in the northeastern part of the Paradox Basin in the United States, divided the fault structure into two units: the fault core and the induced fracture zone. The zone is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00
Inventor 蒋有录刘华陈亮赵凯
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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