Erdors Basin Yanchang Formation Tight Sandstone 3D Microstructures

Collection Title:

Erdors Basin Yanchang Formation Tight Sandstone 3D Microstructures

Collection Description:

Collection of tight sandstone data include CT projection images at 25keV, 35keV and 45keV, CT reconstructed slices, and DCM reconstructed pore and mineral phases distributions in 3D. Additional information and data, such as .dcm data files and animations, are also included. The natural tight sandstone sample used for experiment with diameter and he... moreight of 3mm and 20mm was extracted from a core. The core was drilled from Yaodian area of Yan’an in Erdors Basin, where the geographic structure and layer are belong to the eastern area of Shanbei Slope of Member 6 in Yanchang Formation of Triassic in Erdors Basin. less

Field of Research:

Geophysics not elsewhere classified

DOI:

https://doi.org/10.4225/08/532BB4A949D8C

Start Date:

19 Feb 2012

End Date:

21 Oct 2013

Contact:CSIRO Enquiries
 CSIROEnquiries@csiro.au
 1300 363 400
Keywords:

tight sandstone ;  multi-energy X-ray micro-CT ;  3D microstructure

Lineage:

X-ray micro-tomography experiments were carried out on the BL13W beamline at the Shanghai Synchrotron radiation Facility (SSRF). The tomography images were acquired at monochromatic beam energies of 25keV, 35keV and 45keV, respectively. The distance between the sample and the CCD detector was set to 40mm. Effective pixel size is 3.7μm. For each CT scans, 720 projection images were recorded during a 180 degree rotation along the vertical axis with a fixed angular displacement of 0.25 degree. The exposure time for each projection image was 1s, 1.5s and 8s at beam energies 25keV, 35keV and 45keV, respectively. In the experiments, dark-field images and flat-field images were also recorded. Each flat-field image was recorded after every 40 sample projection images. At the end of the experiments, dark-view fields were recorded. Due to the temporal and spatial variations of synchrotron radiation light, a least squares polynomial curve fitting was used to compensate the X-ray light intensity variations in the vertical direction for each flat-field and projection image, and then these corrected image data were pre-processed and reconstructed using X-TRACT software. Pre-processing includes background correction, normalization, phase-retrieval and ring filtering. After pre-processing the data was reconstructed using a standard FBP parallel-beam algorithm. The CT-slices have been analysed using the DCM least-square segmentation module. The size of the selected area is 600 x 600 x 700. The offset position in each CT-Slice is from 200 to 800, both for X and Y directions. The input density of pyrite and calcite are 4.9g/cm3 and 2.71g/cm3, respectively. The mixed density of quartz and albite is 2.635g/cm3, mixture ratio is 1:1. By averaging over the 700 slices, the calculated void volume fraction (porosity) is 5.292%, the volume fraction for the pyrite is 0.577%, for the calcite is 22.300%, and for the mixture of quartz and albite is 71.800%.

Credit:

Rukai Zhu , Bin Bai, PetrolChina, sample preparation; Huihua Kong, NUC, Haipeng Wang, SXU, X-ray CT image acquisition; Huihua Kong, NUC, Sam Yang, Sherry Mayo, CMSE, CT reconstruction; Sam Yang, CMSE, Ruru Li, Jinxiao Pan, NUC, compositional microstructure calculation

Licence:

Creative Commons Attribution 3.0 Unported Licence

Organisations:

CSIRO (Australia), Shanghai Synchrotron Radiation Facility (SSRF) (China)

Attribution Statement:

Li, Ruru; Kong, Huihua; Yang, Sam; Mayo, Sherry; Zhu, Rukai; Bai, Bin; Pan, Jinxiao; Wang, Haipeng (2013): Erdors Basin Yanchang Formation Tight Sandstone 3D Microstructures. v1. CSIRO. Data Collection. https://doi.org/10.4225/08/532BB4A949D8C

Rights Statement:

All Rights (including copyright) CSIRO Australia 2013.

Access:

The metadata and files (if any) are available to the public.