Evaluation of fractured–vuggy reservoir by electrical imaging logging based on a de noising method

• Autorzy: Xu Fanghui , Wang Zhuwen , Wang Wenhua

Identyfikatory

DOI

10.1007/s11600-021-00558-w

• Języki publikacji: EN

Abstrakty

EN

The existence of fractures and vugs in igneous formation is a key factor to determine the productivity of oil and gas reservoirs. Fracture–vug plane porosity and porosity spectrum (fracture–vug parameters) are important parameters to evaluate the development of fractures and vugs. In the process of drilling, the bit forms shallow holes and scratches on the borehole wall which is characterized by pitting, strip and block noise in the electrical imaging logging static image. The background noise afects the identifcation of fractures and vugs and the extraction of parameters. It is found that the background noise mainly exists in the high-frequency conductivity data. In order to suppress the background noise, empirical mode decomposition is applied to conductivity data of electrical imaging logging, and the wavelet hard threshold de-noising is applied to high-frequency intrinsic mode function components. The de-noising fracture-vug parameters have a good correspondence with the electrical imaging logging static image, and have a better linear relationship with the core porosity. These illustrate that the application of the de-noising method in the electrical imaging logging is reasonable and efective. The de-noising porosity spectrum becomes narrower in the reservoir with poor fractures and vugs, which can reveal the development of secondary pores more clearly. In reservoir interpretation, the de-noising fracture-vug plane porosity and porosity spectrum have good consistency with conventional and acoustic logging data, which can efectively evaluate the fractures and vugs in reservoirs.

Słowa kluczowe

EN

background noise; EMD; porosity spectrum; wavelet hard threshold de-noising; fracture–vug plane porosity; electrical imaging logging

PL

szum; EMD; widmo porowatości

• Wydawca: Instytut Geofizyki PAN ; Springer
• Czasopismo: Acta Geophysica
• Rocznik: 2021
• Tom: Vol. 69, no. 3
• Strony: 761--772
• Opis fizyczny: Bibliogr. 43 poz.

Twórcy

autor

Xu Fanghui

• College of GeoExploration Science and Technology, Jilin University, Changchun 130026, China

• https://orcid.org/0000-0002-1991-3139

autor

Wang Zhuwen

• College of GeoExploration Science and Technology, Jilin University, Changchun 130026, China

• https://orcid.org/0000-0002-8757-7392

autor

Wang Wenhua

• College of Earth Sciences, Jilin University, Changchun 130021, China

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