(677b) Characterization of Microfractures in Organic-RICH Shales and Tight Reservoir Rocks of the Bakken Formation By Integrated Microscopy Techniques
Preliminary results obtained in this study indicate that the UVF technique has a lower microfracture detection limit around 1 Âµm, compared to a detection limit of about 2.5 Âµm for thin-section analysis. Also, about 40%â50% of the fractures detected by UVF are not detected via thin-section analysis. These detection differences might be attributed to the different light exposure modes: transmitted mode for thin-section analysis and reflected mode for UVF. Based on FESEM analysis, fracture-fill material was found to be precipitated salts, organic matter, and/or clays and pyrite. Detailed FESEM fracture morphology made it possible to distinguish between microfractures created in the subsurface during original coring and those created at the surface due to handling and sample preparation. Natural microfractures can also be determined based on their morphological attributes and fill material. These findings are useful for improving predictive reservoir modeling approaches and for enhanced understanding of optimal hydraulic fracturing and/or stimulation practices.
This paper has an Extended Abstract file available; you must purchase the conference proceedings to access it.
Do you already own this?
Log In for instructions on accessing this content.
|AIChE Graduate Student Members||Free|
|AIChE Undergraduate Student Members||Free|