3D Trap Evaluation for Oil-Gas Reservoirs
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Solution Overview
Problem
Current methods for evaluating structural and fault block traps in oil-gas reservoirs rely on qualitative analysis and two-dimensional data, making it difficult to accurately assess the sealing ability and trap amount, especially in complex fault blocks.
Innovation Solution
A 3D TRAP evaluation method that combines three-dimensional seismic and logging data to form a lithology and fault data cube, divided into depth slices for individual sand body unit evaluation, plotting Sweet-Spot diagrams to exhibit trap amounts and calculate total reserved oil and gas quantities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional two-dimensional overlay diagram method is used to evaluate fault sealing ability, then the method is simple to operate, but the accuracy of trap evaluation is insufficient especially for complex fault blocks
Solution Approach 1:
The patent transitions from two-dimensional overlay diagrams to three-dimensional seismic data space for trap evaluation. By constructing fault models and analyzing sand body connectivity in 3D space, the method overcomes the limitations of 2D projections which cannot accurately represent complex fault block geometries and sealing relationships.
Solution Approach 2:
The patent divides the three-dimensional seismic data space into multiple depth slices (horizontal layers). Each slice is independently analyzed for sand body units and their connectivity relationships. This segmentation allows systematic evaluation of complex fault blocks by breaking down the 3D problem into manageable 2D slices while maintaining overall spatial context.
2Measurement precision
If structural uplift amplitude and structual area are used to evaluate structural trap, then the evaluation process is simple, but it is difficult to quantitatively measure the actual trap amount
Solution Approach 1:
The patent introduces quantitative parameters including trap amount (SS), sealing area, and sand body connectivity metrics. Instead of relying solely on qualitative structural uplift amplitude and area, the method calculates specific quantitative measures of trap volume and sealing effectiveness through 3D spatial analysis and depth slice integration.
Solution Approach 2:
The patent replaces conventional geometric calculation methods with 3D seismic data-based spatial analysis. By utilizing seismic attributes and depth slice information, the method substitutes traditional mechanical measurement approaches with advanced geophysical data processing to achieve quantitative trap characterization.
3Measurement precision
If fault block area is used to estimate trap area, then the estimation is quick, but detailed studies on whether the fault block has trap condition are absent
Solution Approach 1:
The patent performs preliminary construction of fault models and depth slice divisions before detailed trap evaluation. By pre-processing the three-dimensional seismic data into structured depth slices and identifying potential sand body units in advance, the method prepares the data framework that enables rapid subsequent analysis of trap conditions without requiring detailed studies from scratch.
Solution Approach 2:
The patent enables the evaluation system to automatically identify sand body units, assess their connectivity across faults, and determine trap conditions within each depth slice. The method allows the data itself to reveal trap characteristics through systematic analysis of sand-mudstone distribution patterns and fault sealing relationships, reducing the need for extensive manual interpretation.
Data Source
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AI summary
The present invention provides a method of searching for oil-gas reservoir based on TRAP-3D software, including: establishing a three-dimensional lithology and fault data cube of an exploration working area according to three-dimensional seismic data and logging data; dividing the three-dimensional lithology and fault data cube into several depth slices of the same depth, and performing an individual sand body unit division for each depth slice; sequentially inputting the depth slices of the three-dimensional lithology and fault data cube into the TRAP-3D software for oil-gas reservoir evaluation. The present invention imporves the accuracy of three-dimensional trap evaluation, is conducive to precise searching of the oil-gas reservoir, can plot a Sweet-Spot diagram on a plane, and get exhibits oil-gas trap amounts of different depths in a longitudinal direction, and can obtain a total trap amount of the oil gas reservoir in the exploration working area.