A method for characterizing growth thrust faults in small and medium-sized extensional fault basins

Abstract

The invention provides a method used for characterizing a small and medium sized extension rift basin growth reverse fault, which belongs to the technical field of geological prospecting. The method comprises the steps that the data of an area to be identified are collected and processed; sequence division is carried out under the guidance of a sequence stratigraphy theory, and an isochronal sequence stratigraphic framework of the area to be identified is established; under the constraint of the isochronal sequence stratigraphic framework of the area to be identified, construction-stratigraphic linkage interpretation is carried out, and positive and reverse faults are identified and classified; stratigraphic-sedimentary linkage interpretation is carried out on classified positive and reverse faults; a pseudo fault which is mistakenly identified is rejected, and a fault framework of the area to be identified is established; construction-sedimentary linkage interpretation is carried out on positive and reverse faults in the fault framework of the area to be identified; a growth fault construction framework is established, and a growth reverse fault in the framework is determined; a tectonic geologic model of the growth reverse fault and the derivative tectonic geologic model are built; and the cause of the growth reverse fault in each tectonic geologic model is analyzed to guide oil and gas exploration of the area to be identified.

Description

Technical field: [0001] The invention relates to a method for depicting growth reverse faults in small and medium-sized extension fault basins, and belongs to the technical field of geological exploration. Background technique: [0002] In the field of geological exploration technology, accurately characterizing the growth reverse faults in small and medium-sized extensional faulted basins in petroleum-bearing sedimentary basins has important guiding significance for reliable prediction of sedimentary systems, types of oil and gas reservoirs and their distribution in such basins. [0003] Structural interpretation techniques based on well-seismic data can be summarized into two types: "facies-surface method" and combined well-seismic interpretation method, which are two qualitative interpretation methods commonly used to identify and describe faults. The "facies-plane method" is mainly based on the conventional seismic event comparison tracking and the lateral change of seis...

AI Technical Summary

Problems solved by technology

Although the accuracy and reliability of fault description and interpretation by the well-seismic joint interpretation method are greatly improved compared with the "facies-surface method", this method takes more structural and stratigraphic factors into account, while factors such as sedimentation and paleogeomorphological height difference before deposition are considered. Insufficient, there is a "pseudo-fault" phenomenon in application, that is, non-faults are misjudged as faults, resulting in low accuracy of fault description and identification of growth faults

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