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Crack identification method and system of tight sandstone formation

A crack identification and tight sandstone technology, applied in radio wave measurement systems, earthwork drilling, geophysical surveys, etc., can solve problems such as large differences in measurement principles, low crack identification accuracy, weak crack response, etc., to achieve easy computer programming. Computational, good theoretical foundation, adaptable effects

Active Publication Date: 2018-10-09
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

However, thin interbeds are developed in tight sandstone formations, relatively low resistivity, large matrix pores, and mainly high-angle fractures, and the fracture response is weak. Not all are applicable, and dual induction logging is commonly used in tight sandstone formations, and the measurement principle is quite different from that of dual laterologging used in high-resistivity tight formations such as carbonate rocks and igneous rocks, which further leads to tight sandstone formations. The accuracy of crack identification is low

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  • Crack identification method and system of tight sandstone formation
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  • Crack identification method and system of tight sandstone formation

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Embodiment Construction

[0034] The present invention will be described in more detail below with reference to the accompanying drawings. Although preferred embodiments of the invention are shown in the drawings, it should be understood that the invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0035] figure 1 A flowchart showing the steps of the method for identifying fractures in tight sandstone formations according to the present invention.

[0036]In this embodiment, the method for identifying fractures in tight sandstone formations according to the present invention may include: step 101, based on the deep induction logging data and the medium induction logging data, respectively obtain the deep induction response value and the medium induction response value, and then ...

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Abstract

The invention discloses the crack identification method and system of tight sandstone formation. The method comprises the following steps of based on deep induction logging data and medium induction logging data, acquiring a deep induction response value and a medium induction response value and acquiring a deep induction response average value and a medium induction response average value; basedon the deep induction response value, the medium induction response value, the deep induction response average value and the medium induction response average value, acquiring a first regression coefficient; based on the first regression coefficient, the deep induction response average value and the medium induction response average value, acquiring a second regression coefficient; based on the deep induction response value, the medium induction response value, the deep induction response average value, the first regression coefficient and the second regression coefficient, acquiring a doubleinduction difference coefficient; and setting a threshold, comparing the threshold and the double induction difference coefficient and identifying a crack. In the invention, through calculating the double induction difference coefficient and comparing with the threshold, a high angle crack in tight sandstone can be effectively identified, and the identification is not affected by changes in formation lithology, a physical property, oiliness and the like.

Description

technical field [0001] The invention relates to the field of petroleum exploration and development, and more specifically, to a method and system for identifying fractures in tight sandstone formations. Background technique [0002] At present, in terms of logging technology, imaging logging is the best way to identify and evaluate fractures, but this method is expensive and time-consuming, and is only used in some key exploration wells. Conventional logging is most widely used in oil exploration and development. Well curves have been used to identify fractures in reservoirs for decades. Logging scientists use various logging response characteristics of fractures to construct a series of the most basic fracture identification parameters, such as the three-porosity ratio method, secondary Porosity index method, borehole relative anomaly method, resistivity invasion correction difference ratio method, etc. These methods are more suitable for high-resistivity tight layers such ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/18G01V3/38E21B49/00G06F17/50
CPCE21B49/00G01V3/18G01V3/38G06F30/20
Inventor 刘志远李军张军苏俊磊南泽宇于文芹
Owner CHINA PETROLEUM & CHEM CORP
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