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A Logging Identification 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 lack of economical and effective methods, high cost, time-consuming imaging logging and other problems of downhole fault structure, and achieve the goal of promoting in-depth exploration and development Effect

Active Publication Date: 2016-08-17
CHINA UNIV OF PETROLEUM (EAST CHINA)
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AI Technical Summary

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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  • A Logging Identification Method of Fault Structure
  • A Logging Identification Method of Fault Structure
  • A Logging Identification Method of Fault Structure

Examples

Experimental program
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Effect test

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 present invention relates to a method for identifying geological phenomena, in particular to a logging identification method for a fault structure, which is based on conventional logging and integrates seismic, mud logging and other data to quickly and effectively identify the technical idea and method of the downhole fault structure. Including: on the basis of determining the location of the breakpoint, use the difference in well logging data to conduct horizontal comparison of adjacent wells and vertical comparison of the target well, and qualitatively divide the fault structure; Select points at equal intervals between belts and surrounding rocks to read effective logging data, and draw intersection maps to quantitatively identify fault structures and conduct effective inspections. The method of the invention has the characteristics of economy, reliability and high efficiency, is convenient for wide-scale popularization in fault development areas, and plays a positive role in promoting deep 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 Patents(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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