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The Cause of Hydrocarbon through Salt in Kuqa Basin, Northwest China: Evidence from Mechanics Laboratory Results and Oil-Gas Exploration Verification
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, Fifth International Conference on Fault and Top Seals, Sep 2019, Volume 2019, p.1 - 5
Abstract
Summary
Both anhydrite rocks and salt rocks have embrittlement at low temperatures and ductility at high temperatures. The brittle-ductile transition depth of evaporites in Kuqa Basin is 3000m or so. In the late tectonic active period of Kuqa Era, the strong tectonic compression from South Tianshan will generate fractures and faults in evaporites to let hydrocarbon immigrate upward if burial depth shallower than 3000m. However, after evaporites were continuously buried deeper than 3000m, previous faults would be welded to keep good seals. so early oil accumulations were destroyed and late high mature coal gas accumulations were preserved.
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