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Well logging curve standardization method and system based on sedimentary facies constraint

A technology of logging curves and sedimentary facies, which is applied in the directions of measurement, earthwork drilling and production, boreholes/well components, etc., can solve problems such as errors, inconformity with geological laws, and inability to meet reservoir prediction accuracy, etc., to improve lateral continuity Effect

Pending Publication Date: 2020-04-07
CHINA PETROLEUM & CHEM CORP +1
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AI Technical Summary

Problems solved by technology

However, in actual work, in some work areas, the lateral variation of the sedimentary facies is large, and the wells in different positions of the work area are in different sedimentary facies, so it is impossible to find the standard layer with the same sedimentary facies and stable deposition that exists in all wells in the whole area.
In addition, there are also differences in the vertical errors of individual wells. After the standard layer mudstone section is corrected, the relative errors of other intervals may not be completely avoided.
This makes the standardization of conventional logging curves limited, and may even bring results that do not conform to geological laws, and cannot meet the accuracy of reservoir prediction
Especially for work areas with relatively large lateral changes in sand bodies, if only a certain well is selected as a standard well, the standardized logging curve cannot truly reflect the underground change trend, resulting in unsatisfactory reservoir prediction results

Method used

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  • Well logging curve standardization method and system based on sedimentary facies constraint
  • Well logging curve standardization method and system based on sedimentary facies constraint
  • Well logging curve standardization method and system based on sedimentary facies constraint

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Embodiment Construction

[0029] 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.

[0030] figure 1 A flowchart showing the steps of the method for standardizing well log curves based on sedimentary facies constraints according to the present invention.

[0031] In this embodiment, the logging curve standardization method based on sedimentary facies constraints according to the present invention may include: Step 101, determining the standard layer of the formation in the work area, and according to the analysis results of the sedimentary facies, in each facies zone ...

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Abstract

The invention discloses a well logging curve standardization method and system based on sedimentary facies constraint. The method comprises the steps: determining a standard layer of a work area stratum, and selecting a standard well from each phase zone of the standard layer according to an analysis result of sedimentary facies; according to the well logging curve of the standard well in each phase zone, acquiring the corresponding well logging curve correction value in each phase zone; correcting the well logging curve of the standard well in each phase zone according to the corresponding well logging curve correction value to obtain a corrected well logging curve of the standard well; for the logging curve of the target well in each phase zone, and performing standardizing according tothe corresponding corrected logging curve of the standard well to obtain a standardized logging curve of the target well. According to the method, based on the actual data, the method achieves the standardizing of the logging curve split-phase zones in a work area, reasonably keeps differences between the phase zones, takes a target layer sand body as a standard layer to carry out logging curve standardization, eliminates the longitudinal non-geological factor errors, and provide reliable logging data for seismic inversion.

Description

technical field [0001] The invention relates to the field of seismic reservoir prediction, and more specifically, to a logging curve standardization method and system based on sedimentary facies constraints. Background technique [0002] Well logging data contains rich subsurface information, which is an important basic data for seismic inversion and directly affects the accuracy of inversion results. However, due to the influence of wellbore environment, measurement time, instrument calibration, human operation and other factors, the logging energy between wells is unbalanced, which makes the logging data vary greatly in the lateral direction and destroys the lateral continuity of the inversion results. The log standardization is the method to correct this error. [0003] There are many common methods of logging curve standardization, such as histogram method, mean value correction method, trend surface method and so on. Usually, the mudstone section deposited stably in o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00E21B47/00
CPCE21B49/00E21B47/00
Inventor 李芦茜冉琦王秀玲朱博华杨江峰马永强李洋胡玮
Owner CHINA PETROLEUM & CHEM CORP
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