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Effective deep zone exploration achieved with theoretical breakthroughs in multi-path hydrocarbon generation

Research progress made on ancient source rock development mechanism in deep zones, the gas generation potential during high-over mature stage, and the identification for organic-inorganic composite hydrocarbon generation and natural gas genesis.

Highlights:

  • http://webadminThree types of gas-generating materials in ancient gas bearing system were presented, namely, retained hydrocarbon, ancient reservoir and “semi-aggregated and semi-dispersed” liquid hydrocarbon, bringing more attention to high-over mature zones for gas reservoir formation.
  • The organic matter-rich Proterozoic–Paleozoic shale deposition was controlled by the earth’s orbital force, atmospheric circulation and stratified thalasso chemical environment; the hydrocarbon generating potential of ancient kerogen was determined by the type of microorganism and the redox conditions. The development of 7 sets of high quality source rocks of Proterozoic Era provided a basis for resource potential evaluation and exploration prospect forecast of ancient petroleum system.
  • The organic-inorganic composite hydrocarbon generation mechanism under high temperature and high pressure revealed the hydrogenation reaction mechanism of different water-rock systems and its contribution to gas generation. The transition metal element promoted the reproduction of microorganism and the evolution of hydrocarbon generating. These results provided a new approach to explore the oil and gas generation potential of ancient petroleum system.
  • The late-stage pyrolysis gas generation in multiple-source kitchen of ancient formation was the key factor for large scale gas accumulation in Lower Paleozoic. High-over mature zones had higher exploration potential according to the “multiple golden belt” gas enrichment theory. Pyrolysis gas filling and gas wash fractionation were the key mechanism for secondary condensate gas reservoir formation.

The research results added 220 billion cubic meters of proven gas reserves and 203.8 billion cubic meters of probable gas reserves in the Sichuan Basin, and added 2.19 billion tons of oil and gas in place in the Tarim basin since 2013.

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