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A comprehensive logging identification method for natural fractures guided by geological models

A natural fracture and identification method technology, applied in geophysical measurement, instrumentation, etc., can solve the problems of difficulty in identifying fractures from logging curves, high cost of formation dip logging and imaging logging, and rich logging curves

Active Publication Date: 2020-06-30
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

[0002] Core observation can provide first-hand information about fracture occurrence, mechanical properties, filling characteristics, and oil and gas properties, but limited by the number of core wells in an area, the application of fracture identification is hindered
[0003] Establishing a fracture logging interpretation model through the "core calibration logging" method is widely used, but due to the many influencing factors of conventional logging curves, the identification accuracy is limited, so it is very difficult to identify fractures with a single logging curve
[0004] Fracture identification research by formation dip logging and image logging has made up for the problem that conventional logging curves cannot accurately display formation characteristics, and has now become the most effective method for fracture logging interpretation. The well cost is too high, the actual data obtained is less, and the conventional well logging curve is rich

Method used

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Embodiment

[0019] The Shasanzhongersha Formation in the Boxing sub-sag is a tight sandstone reservoir. Predicting the distribution of fractures is an important task in the evaluation of sweet spots in this area. There are many faults in the study area, and natural fractures are associated with faults. By adopting the method of the invention, the distribution of natural fractures in the Ersha Formation of Sha3 in the research area is predicted.

[0020] First, according to the core and thin-section data in the study area, the fault is divided into two parts: the fault core and the induced fracture zone. The fault core is located in the center of the fault fracture zone. After structural damage and hydrothermal action, a large number of angular fracture breccias are formed. Rock and faulted dolomite, with widely developed fractures and large-scale fractures, filled with dolomite and quartz veins; the induced fracture zone is between the fault core and the original formation, the lithology i...

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Abstract

The invention relates to a natural fracture logging comprehensive identification method based on geological mode guidance, and belongs to the field of petroleum geophysical exploration. The natural fracture logging comprehensive identification method includes the following steps of (1) establishment of a geological mode of a natural fracture, (2) qualitative identification of conventional loggingresponse of the natural fracture, (3) quantitative discrimination of the conventional logging response of the natural fracture, (4) orthogonal dipole acoustic logging identification of the natural fracture and (5) machine identification of the natural fracture. The novel natural fracture logging comprehensive identification method is provided, a novel industrialization method for crack predictionby using the natural fracture logging comprehensive identification method is established, and the natural fracture logging comprehensive identification method is suitable for oil and gas exploration in fault development areas, has more geological significance than conventional methods, improves the crack prediction accuracy and has great potential for practical application.

Description

technical field [0001] The invention relates to a petroleum geophysical prospecting method, which is an industrialized method for comprehensive identification of natural fractures guided by geological models. Background technique [0002] Core observation can provide first-hand information about fracture occurrence, mechanical properties, filling characteristics, and hydrocarbon-bearing properties, but the application of fracture identification is hindered by the limitation of the number of core wells in an area. [0003] The method of "core scale logging" to establish fracture logging interpretation models is widely used. However, due to the many influencing factors of conventional logging curves, the recognition accuracy is limited, so it is very difficult to identify fractures with a single logging curve. [0004] The study of fracture identification through formation dip logging and image logging has made up for the problem that conventional logging curves cannot accurat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V11/00
CPCG01V11/00
Inventor 马存飞孙裔婷董春梅
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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