A method for evaluating the formation and evolution of continental shale oil in large freshwater lake basins

Abstract

The invention discloses a method for evaluating the formation and evolution of terrestrial mud shale oil in a large freshwater lake basin. The method uses conventional drilling cores and geological experiment analysis, pressure-preserved and sealed coring, and frozen sample oil content calibration and logging technology. Combined method to evaluate shale oil content recovery, vertical sweet spot layer and plane sweet spot area; use depth, Ro, kerogen, chloroform bitumen "A", free oil, adsorbed oil, gas-oil ratio and other parameters , the formation and evolution evaluation model of continental shale oil was established, which met the needs of shale oil exploration. This method evaluates that the mass conversion of adsorbed oil to free oil at Ro1.1%-1.6% is the most favorable stage for the formation of shale oil, and shale oil at mature and highly mature stages is 1.5-3.5 times that of the classic oil generation model. The "sweet spots" of shale oil in the Liao Basin have been selected and breakthroughs in exploration have enabled the exploration depth to be extended to 2600m and the area of ​​sweet spots to be expanded by 1.2 times, laying the material foundation for large-scale exploration of continental mud shale oil in large freshwater lake basins.

Description

A method for evaluating the formation and evolution of continental shale oil in large freshwater lake basins technical field The present invention relates to oil field unconventional oil and gas exploration technical field, relate in particular to a kind of large-scale freshwater lake basin continental mud sheet Evaluation methods for formation and evolution of rock oil. Background technique [0002] The breakthrough of shale oil in North America has brought about a new round of technological revolution in the global oil and gas industry, leading to a worldwide It has set off a boom in shale oil exploration and development, and the global technically recoverable reserves of shale oil can reach 4.86×10 10 t. China in multiple lakes The exploration and development of mud shale oil has been carried out in the facies basin, and the exploration and development of shale oil has been carried out in Songliao, Ordos, Bohai Bay, Nanxiang, Junggar Basin, etc. Several wells h...

AI Technical Summary

Problems solved by technology

[0004] The present invention overcomes the problem that the existing methods in the background technology cannot solve the formation and evolution of continental mud shale oil in large freshwater lake basins and effectively guide the exploration of mud shale oil, and provides a large freshwater lake basin continental mud shale Oil Formation and Evolution Evaluation Method

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