--> --> Synthetic nano-petrophysics investigation of the Haynesville Shale in eastern Texas

AAPG Southwest Section Annual Convention

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Synthetic nano-petrophysics investigation of the Haynesville Shale in eastern Texas

Abstract

As one of the most productive shale gas plays, the Haynesville Shale has the properties of high geopressured gradient and temperature. To analyze pore geometry and wettability related connectivity of this formation, multiple methods such as TOC, XRD, vacuum saturation, mercury intrusion capillary pressure (MICP), contact angle, and fluid imbibition have been used on 10 Haynesville Shale core samples from a well over a vertical distance of 123 ft. The results from those tests show that the Haynesville Shale is calcareous in nature with 2~5% of TOC. The porosities range from 2 to 8% and the pore-throat sizes are concentrated on the nanoscale. Most of the samples show strong oil-wet behavior and only one sample exhibits mixed wettability. In general oil-wet samples show a higher pore connectivity when they imbibe hydrophobic (n- decane:toluene=2:1) than hydrophilic (deionized water) fluids.