Metamorphic rock buried hill productivity prediction method based on ternary coupling

Abstract

The invention discloses a metamorphic rock buried hill productivity prediction method based on ternary coupling, and the method comprises the steps: firstly building a lithology characterization coefficient calculation model based on the morphological changes of dark mineral content differences in neutron and density curves; secondly, conducting normalization processing on the deep resistivity amplitude difference, the shallow resistivity amplitude difference and the midpoint response value, and establishing a fracture characterization index calculation method; thirdly, establishing a gas logging total hydrocarbon value correction method, and establishing a metamorphic rock buried hill oil-gas response coefficient by utilizing the amplitude and form change of the corrected gas logging total hydrocarbon value; and finally, applying the calculation result and method to coupling coefficient calculation, and establishing a productivity prediction equation by utilizing the coupling coefficient and the divided reservoir effective thickness and combining the actual test result of the drilled well of the metamorphic rock buried hill. According to the metamorphic rock buried hill productivity prediction method provided by the invention, the productivity prediction precision is improved, quantitative evaluation of the metamorphic rock buried hill productivity is realized, and the methodhas important guiding significance for logging evaluation of similar reservoirs.

Description

technical field [0001] The invention belongs to the field of evaluation of metamorphic rock buried hills and the field of petrophysical parameters, in particular to a method for predicting the productivity of metamorphic rock buried hills based on the coupling of lithology, fractures, and oil and gas charging capabilities. Background technique [0002] In recent years, with the breakthrough of the deep buried hills in the Bohai Sea, the key target layer of the Bohai Sea research has moved down, and more and more exploratory wells have revealed fractured buried hill reservoirs. However, in the exploration evaluation, it was found that there is a mismatch between the actually tested oil and gas well productivity, porosity, and fracture development. When the porosity is large, the actual test results are poor; when the porosity is small, the actual test productivity is relatively high, which brings great doubts to geological and logging researchers. [0003] Reservoir producti...

AI Technical Summary

Problems solved by technology

Since the picking of cracks is done manually, different interpreters pick up different occurrences and quantities, and the crack picking process takes a long time, resulting in poor generalization of the method and greater uncertainty in the productivity prediction results

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