Reef-Shoal Reservoir Identification Using Progressive Constraint Method
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Solution Overview
Problem
The exploration and development of lacustrine carbonate rock reservoirs are hindered by the complex lithology and uneven distribution of wells, poor seismic data quality, and complex reflection characteristics, making it difficult to predict favorable reservoir development areas in faulted lacustrine basins.
Innovation Solution
A method integrating geology and geophysics using basement structure, paleogeomorphology, and seismic facies progressive constraints to establish a reservoir evaluation standard for identifying reef-shoal reservoirs, involving basement structure analysis, paleogeomorphology classification, seismic facies characterization, and geophysics-integrated reservoir prediction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional reservoir evaluation methods are used, then the exploration process can proceed, but the prediction accuracy of favorable reservoir development areas is low due to complex lithology and poor seismic data quality
Solution Approach 1:
The patent segments the reservoir evaluation process into three distinct stages: basement structure analysis, paleogeomorphology reconstruction, and seismic facies interpretation. Each stage focuses on specific geological aspects and produces intermediate results that are progressively integrated, allowing complex evaluation to be broken down into manageable components that improve overall prediction accuracy
Solution Approach 2:
The patent merges geology and geophysics into an integrated evaluation system that combines basement structure characteristics, paleogeomorphology types, and seismic facies features. This integration creates a comprehensive framework that leverages multiple data sources and methodologies to overcome the limitations of individual approaches and significantly improve reservoir prediction accuracy
2Loss of information
If more wells are deployed to improve data coverage, then reservoir characterization can be enhanced, but exploration costs and time increase
Solution Approach 1:
The patent performs preliminary basement structure analysis and paleogeomorphology reconstruction before seismic facies interpretation and well deployment. By establishing the geological framework in advance, the method identifies favorable reservoir development areas that guide subsequent well placement, reducing the need for extensive well networks and accelerating the exploration process
Solution Approach 2:
The patent introduces paleogeomorphology reconstruction as an intermediary step between basement structure analysis and seismic facies interpretation. This intermediate stage fills information gaps by inferring ancient geological configurations from current seismic data, enabling better reservoir prediction without requiring additional well data or extending exploration time
Data Source
AI summary
A method for identifying a reef-shoal reservoir in a faulted lacustrine basin based on a basement structure-paleogeomorphology-seismic facies progressive constraint, including: analyzing a basement structure of a work area; establishing a paleogeomorphology classification standard according to thickness, reflection structure and stratigraphic dip; based on well-seismic calibration and forward modeling, establishing a seismic facies classification standard for reef-shoal facies belts under different paleo-geomorphic conditions, and quantitatively predicting and describing a reservoir in the reef-shoal facies belts using seismic facies-controlled inversion; and according to analysis results of basement structure characteristic, paleogeomorphology classification and seismic facies, establishing a method for predicting a favorable reservoir.