Seismic Inversion Using AVA Neural Models for Frontier Reservoir Prediction
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Solution Overview
Problem
Traditional seismic inversion methods are time-consuming, expensive, and require significant manual input, and are ineffective in frontier exploration areas where there are no drilled wells, limiting the accuracy of subsurface property predictions.
Innovation Solution
A machine-learning assisted seismic inversion method using a global AVA database and neural networks to estimate lithology, fluid type, and porosity directly from seismic data, leveraging well logs and synthetic seismic modeling to generate training datasets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional seismic inversion methods are used, then subsurface models can be generated, but the process is time-consuming and expensive
Solution Approach 1:
The patent applies preliminary action by pre-training machine learning models using synthetic seismic data generated from well logs before actual inversion is needed. This pre-computation of training datasets and model preparation enables rapid inversion processing without time-consuming traditional methods during actual exploration, directly resolving the time-cost contradiction while maintaining accuracy.
Solution Approach 2:
The patent substitutes traditional mechanical seismic inversion methods with machine learning-based computational approaches. Instead of using conventional iterative inversion algorithms that require significant manual input and computational resources, the system employs trained neural networks that can rapidly predict subsurface properties from seismic data, dramatically reducing processing time while preserving measurement precision.
2Adaptability or versatility
If traditional inversion methods are used, then subsurface models can be generated with available well data, but they are ineffective in frontier exploration where there are no drilled wells
Solution Approach 1:
The patent applies universality by training machine learning models on diverse synthetic seismic data from multiple wells and geological scenarios, creating a universal model that can adapt to different exploration environments including frontier areas without drilled wells. The model learns general subsurface property relationships that transfer across different geological settings, enabling effective prediction where traditional well-constrained methods fail.
Solution Approach 2:
The patent uses copying by creating synthetic seismic data and corresponding subsurface property models from existing well logs to generate training datasets. These synthetic copies simulate various geological scenarios including frontier exploration conditions, allowing the machine learning model to learn from virtual representations of target environments and apply this knowledge to actual frontier exploration where no real well data exists.
3Ease of operation
If traditional seismic inversion is performed, then subsurface images can be created, but significant manual input is required making the process expensive
Solution Approach 1:
The patent applies self-service by implementing automated machine learning pipelines that perform seismic inversion without significant manual intervention. The system automatically preprocesses seismic data, applies trained models, and generates subsurface property predictions, eliminating the need for expert operators to manually guide each inversion process while maintaining high productivity and efficiency.
Solution Approach 2:
The patent implements feedback mechanisms where the machine learning model continuously refines predictions based on input seismic data patterns and previously learned relationships. The system incorporates iterative optimization where prediction results feed back into the processing pipeline, automatically adjusting parameters and improving accuracy without manual intervention, thereby enhancing both ease of operation and productivity simultaneously.
Data Source
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AI summary
A method is described for inverting seismic data including obtaining well logs representative of subsurface volumes of interest; generating an amplitude variation with angle (AVA) database from the well logs by seismic modeling, wherein the seismic modeling is performed a plurality of times for all combinations of fluid substitutions of brine, oil, and gas and low porosity, mid-porosity, and high porosity; generating a trained AVA model using the AVA database; obtaining a seismic dataset; calibrating the seismic dataset; computing seismic attributes for the calibrated seismic dataset using statistics for AVA classification; and generating direct hydrocarbon indicators as a function of position in the subsurface volume of interest by applying the trained AVA model to the seismic attributes. The method is executed by a computer system.