Determining method of complex mountain-front effective source rock and source rock structural model

Abstract

The invention discloses a determining method of complex mountain-front effective source rock and a source rock structural model. The method includes the steps of implementing spatial distribution of potential source rock, restoring erosion thickness of different structural unit formations, restoring features of a paleo-geothermal field, determining hydrocarbon conversion type of the source rock by numerical simulation, and determining distribution of the complex mountain-front effective source rock according to the spatial distribution features of the source rock, the hydrocarbon conversion types of the source rocks at different positions of the different structural units and features of abundance of organic matters. Meanwhile, by means of the study based on the method of recovering hydrocarbon conversion of the source rocks in the study area, reliability of resource quantity evaluation is improved, the blank in determining the complex mountain-front effective source rocks is filled, and results help greatly boost the progress of next resource evaluation.

Description

technical field [0001] The invention belongs to the technical field of oil and gas exploration resource evaluation, and in particular relates to a method for determining effective source rocks in a complex piedmont zone and a structure model of source rocks. Background technique [0002] The piedmont structural belt is a complex structural development area adjacent to the piedmont formed by collisional orogeny, where anticlines and thrust blocks are developed in rows and belts, which have good trap conditions and are capable of forming large and extra-large oil and gas It is the key field for domestic and foreign oil and gas breakthroughs. [0003] Although the piedmont zone is currently one of the most oil-gas-rich regions in the world, due to the superposition and reformation of multi-phase tectonic movements, the spatial distribution of source rocks is complex, with horizontal partitions and zones, vertical multiple sets of superposition, and experienced multiple Early s...

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Problems solved by technology

[0003] Although the piedmont zone is currently one of the most oil-gas-rich regions in the world, due to the superposition and reformation of multi-phase tectonic movements, the spatial distribution of source rocks is complex, with horizontal partitions and zones, vertical multiple sets of superposition, and experienced multiple Early structural uplift and strata subsidence, burial hydrocarbon generation history is complex, making it difficult to determine effective source rocks, resulting in high risk and low success rate of oil and gas exploration

Previous studies on the determination of effective source rocks in the piedmont zone are rare. Zou Huayao once analyzed the hydrocarbon generation history of the underlying source rocks in the thrust zone. The instantaneous deep burial of source rocks generates hydrocarbons, which is manifested by the significant acceleration effect of thrust structure superposition on source rocks’ hydrocarbon generation, but it has not been studied on the hydrocarbon generation evolution of source rocks in other structural units in the thrust zone, and the thrust zone has not been systematically evaluated. Whether the source rock is effective or not (Zou Huayao, "The Mechanism of Rapid Accumulation in the Late Kelasu Thrust Zone in the Kuqa Depression", Chinese Science Series D: Earth Science), Dajiang discussed the evolution of source rocks under thrust and nappe Compared with the complex situation of multi-stage nappe in the piedmont zone, it is too simple, and it does not clarify the hydrocarbon generation evolution process of source rocks in different structural units (Dajiang , "Foreland Basin Thrust Napping and Source Rock Evolution", Natural Gas Industry)

With the improvement of oil and gas exploration, the requirements for evaluating the potential of source rocks are becoming more and more refined, and the existing technical methods can no longer meet the requirements. It is necessary to develop a more systematic and precise method for determining the effective source rocks in the piedmont zone.

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