overpressures role in generating and sealing shale gas ... - Cnr -cme
overpressures role in generating and sealing shale gas ... - Cnr -cme
overpressures role in generating and sealing shale gas ... - Cnr -cme
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M.V.Batistatu<br />
OVERPRESSURES ROLE IN<br />
GENERATING AND SEALING SHALE<br />
GAS & WET SHALE ACCUMULATIONS
Overpressures Role <strong>in</strong> Generat<strong>in</strong>g <strong>and</strong><br />
Seal<strong>in</strong>g Shale Gas & Wet Shale Accumulations<br />
• Generat<strong>in</strong>g conditions:<br />
Pellitic lithology<br />
Anoxic environment<br />
Organic matter source/content<br />
Organic metamorphism<br />
Hydrocarbon generation<br />
Expel / seal processes<br />
Quantitative evaluation
Overpressures Role <strong>in</strong> Generat<strong>in</strong>g <strong>and</strong><br />
Seal<strong>in</strong>g Shale Gas & Wet Shale Accumulations<br />
Oil W<strong>in</strong>dow,<br />
Thermal Gas
Overpressures Role <strong>in</strong> Generat<strong>in</strong>g <strong>and</strong><br />
Seal<strong>in</strong>g Shale Gas & Wet Shale Accumulations
Overpressures Role <strong>in</strong> Generat<strong>in</strong>g <strong>and</strong> Seal<strong>in</strong>g<br />
Shale Gas & Wet Shale Accumulations<br />
• Overpressures generat<strong>in</strong>g processes<br />
1. Overburden effect<br />
2. Tectonic stresses<br />
3. Increases <strong>in</strong> fluid volume<br />
4. Osmosis<br />
5. Hydrostatic
Overpressures Role <strong>in</strong> Generat<strong>in</strong>g <strong>and</strong> Seal<strong>in</strong>g<br />
Shale Gas & Wet Shale Accumulations
Overpressures Role <strong>in</strong> Generat<strong>in</strong>g <strong>and</strong> Seal<strong>in</strong>g<br />
Shale Gas & Wet Shale Accumulations<br />
• Overpressured <strong>shale</strong>s effects:<br />
Layers limits impermeability<br />
Higher porosity<br />
Higher temperature<br />
Reactions/processes velocity<br />
Primary migration delay <strong>and</strong>/or stopp<strong>in</strong>g<br />
Low expell<strong>in</strong>g rate 10 to 15%<br />
<br />
Higher <strong>in</strong> situ (<strong>shale</strong>) hydrocarbon potential
Overpressures Role <strong>in</strong> Generat<strong>in</strong>g <strong>and</strong> Seal<strong>in</strong>g<br />
Shale Gas & Wet Shale Accumulations<br />
• Case study:
Overpressures Role <strong>in</strong> Generat<strong>in</strong>g <strong>and</strong> Seal<strong>in</strong>g<br />
Shale Gas & Wet Shale Accumulations
Overpressures Role <strong>in</strong> Generat<strong>in</strong>g <strong>and</strong> Seal<strong>in</strong>g<br />
Shale Gas & Wet Shale Accumulations
Overpressures Role <strong>in</strong> Generat<strong>in</strong>g <strong>and</strong> Seal<strong>in</strong>g<br />
Shale Gas & Wet Shale Accumulations<br />
Seismic<br />
cross section<br />
Eastern<br />
Carpathians<br />
Outer Flisch<br />
Zone
Overpressures Role <strong>in</strong> Generat<strong>in</strong>g <strong>and</strong> Seal<strong>in</strong>g<br />
Shale Gas & Wet Shale Accumulations<br />
• Filed conditions:<br />
• High pressures<br />
• Thrust tectonics<br />
• Compressional stress<br />
• Wet <strong>shale</strong> maturity<br />
• Significant depth<br />
• Salt seal
Overpressures Role <strong>in</strong> Generat<strong>in</strong>g <strong>and</strong> Seal<strong>in</strong>g<br />
Shale Gas & Wet Shale Accumulations<br />
• Conclusions:<br />
<br />
<br />
<br />
<br />
<br />
Overpressures affect <strong>in</strong> a significant manner the generat<strong>in</strong>g<br />
<strong>and</strong> expell<strong>in</strong>g processes for a shally formation<br />
Impermeable seals provided by rapid sedimentation&<br />
overload at the layers’ limits stop fluids expel from source<br />
rock<br />
Overpressure enable a faster chemical /thermal<br />
geochemical metamorphism thus the generation <strong>and</strong> even<br />
overmaturity of hydrocarbons is enhanced<br />
Many of source rock formations from Carpathians orogenic<br />
belt may represent favorable conditions for the existence of<br />
<strong>shale</strong> <strong>gas</strong> type accumulations<br />
Overpressured <strong>shale</strong> formations may represent an<br />
important doma<strong>in</strong> for <strong>shale</strong> <strong>gas</strong>& wet <strong>shale</strong> hydrocarbons<br />
accumulation
THANK YOU !
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