SHALLOW SHALE GAS IN QUEBEC'S SEDIMENTARY BASINS
While testing the deep shale potential, exploration efforts are also focussed on evaluating the potential of the other shale gas play’s potential. Since 2008, Junex has started to evaluate gas potential in three other shales: 1) Shallow to medium depth thermogenic shale gas; 2) Overthrusted shale gas; 3) Intra-Appalachians sub-basin shale gas. This presentation will focus on the assessment of the shallow to medium depth thermogenic shale gas play. Junex is the largest landholder in this play with permits covering approximately 600,000 acres (gross).
Also, in this presentation, the shallow play will be described based upon the data available regarding the basin geology, shale mineralogy, organic matter type, gas geochemistry, structural style and infrastructure access. The characteristics of the play, from a geological, geochemical, structural and geophysical perspective, will be reviewed.
Research undertaken by JUNEX’s exploration team has highlighted five major points concerning the shallow shale gas play:
- Shallow shales have higher TOC content in several areas of the play;
- Almost half of the play is located in the liquid-rich gas zone;
- The shale gas zone are overpressurized despite its shallow depth;
- Drilling and completion costs are lower since drilling depth is under 1,000 meters;
- Propane frac stimulation in the shallow shale play is technically viable.
In addition to creating a large geoscience database, new exploration efforts undertaken by JUNEX exploration team have permitted to evaluate the hydrocarbon potential of the shallow shale play in terms of unconventional resources.