Method for synthesizing transverse-wave well-logging curve under stratum condition

Abstract

The invention discloses a method for synthesizing a transverse-wave well-logging curve under a stratum condition. The method comprises the following steps of: standardizing the well-logging curve; selecting a key well with transverse-wave well-logging data in a research area; selecting a marker bed in the key well; computing mineral constituents in the stratum; according to a geological layering condition in the area, on the basis of main mineral constituents in a rock core analysis, establishing a multi-mineral model of each bed; computing transverse-wave well-logging response of each mineral constituent of the stratum rock; re-establishing the transverse-wave well-logging curve; and fitting according to the transverse-wave well-logging responses of the mineral components and the computed volumes of the mineral constituents in each bed to obtain the transverse-wave well-logging curve of the whole stratum. By using the conventional well-logging curve and the fine multi-mineral model and according to the transverse-wave well-logging responses of the constituents of different minerals, pores, fluids and the like, a transverse-wave curve representing the features of the stratum is fitted out and the fitting precision and accuracy are very high.

Description

technical field [0001] The invention relates to a method for synthesizing well logging curves, in particular to a method for synthesizing shear wave logging curves under formation conditions. Background technique [0002] Shear wave logging information plays an important role in seismic antiseismic, formation fluid detection and identification. Due to the high cost of shear wave logging information, it has not been measured in most early exploration wells and current development wells. For oil fields in the middle and late stages of development, seismic inversion and formation fluid detection are essential for a new round of potential exploration. Therefore, it is very important to perform shear wave reconstruction (synthesis) for wells without shear wave logging data. At present, there are many softwares for shear wave reconstruction, mainly including slog, Xu-White theoretical model, etc., but the software is expensive to purchase and relatively complicated to implement;...

AI Technical Summary

Problems solved by technology

At present, there are many softwares for shear wave reconstruction, mainly including slog, Xu-White theoretical model, etc., but the software is expensive to purchase and relatively complicated to implement; there are also simple volume models and P / S wave velocity ratio methods, etc. Shear wave accuracy is relatively poor

The commonly used simple model method is only to divide the formation into two parts: rock skeleton and pores for shear wave synthesis, and the values ​​of the shear wave logging responses of these two parts have a lot to do with the experience of the operator, which is likely to cause errors

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