Multi-period non-continuity hydrocarbon potential evaluation method for superimposed basin

Abstract

The invention provides a multi-period non-continuity hydrocarbon potential evaluation method for a superimposed basin, and the method comprises the steps: 1, building a stratigraphic framework, and evaluating the distribution condition of the overlying strata of hydrocarbon source rocks; 2, analyzing the structural evolution history of the basin, and carrying out the dividing of a structural evolution unit; 3, calculating the denudation quantity of an overlying denudated stratum of the hydrocarbon source rocks, and carrying out the prototype basin layer by layer; 4, determining the burial history, geothermal history and hydrocarbon generation history of the hydrocarbon source rocks through employing the above analysis result and combining with the basin simulation technology, and determining a secondary hydrocarbon generation mode; 5, calculating the hydrocarbon generation quantities of a construction unit in different periods, evaluating the modern hydrocarbon generation capability, and determining a beneficial secondary hydrocarbon generation center. The method provided by the invention is clear in thinking, is simple in application, and is feasible for the evaluation of the hydrocarbon potential of the multi-period non-continuity hydrocarbon source rocks.

Description

technical field [0001] The invention relates to the technical field of oilfield exploration, in particular to a multi-stage non-continuous hydrocarbon generation potential evaluation method in superimposed basins. Background technique [0002] The evaluation of hydrocarbon generation potential of source rocks is the primary and fundamental aspect of oil and gas exploration. The source rocks under the continuous thermal evolution process have a "one-time continuous" hydrocarbon generation process, such as the Cenozoic Lower Tertiary source rocks in the Jiyang Depression. Due to the single tectonic movement, the source rocks have a continuous hydrocarbon generation process. The evaluation of hydrocarbon generation capacity is relatively simple. However, for source rocks located in ancient strata in superimposed basins, such as Upper Paleozoic coal-measure source rocks, they have undergone multiple stages of structural transformation during geological evolution, and the number...

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Problems solved by technology

At present, there is a lack of specific methods for the evaluation of this type of resource potential, and the evaluation method of continuous hydrocarbon generation is often borrowed. This method does not consider geological processes such as structural evolution and stratum denudation, resulting in unreasonable values ​​of parameters such as hydrocarbon generation rate. Calculation The obtained hydrocarbon generation value is inaccurate and cannot provide accurate resource information for the exploration of this type of oil and gas reservoirs

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