Determination method and structural model of source rocks in complex piedmont effective source rocks

Abstract

The invention discloses a method for determining effective hydrocarbon source rocks in a complex piedmont zone and a source rock structure model. The method for determining effective hydrocarbon source rocks includes the following steps: confirming the spatial distribution of potential hydrocarbon source rocks and restoring strata of different structural units The denudation thickness of the source rocks can be recovered to restore the characteristics of the paleothermal field, and the hydrocarbon generation and evolution types of the source rocks can be determined through numerical simulation. Distribution of effective source rocks in complex piedmont. The invention improves the evaluation accuracy of the source rock by determining whether the source rock in the piedmont zone is effective or not; at the same time, based on the research on the recovery method of the hydrocarbon generation and evolution of the source rock in the study area, the reliability of the resource evaluation is improved. This technology fills the gap in the determination of effective source rocks in complex piedmont zones, and the results will greatly advance the process of resource evaluation in the next step.

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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