Carbonatite reservoir prediction method based on pre-stack multi-attribute and ancient landform fusion technology

A carbonate reservoir and prediction method technology, applied in the field of petroleum exploration, can solve problems affecting reservoir accuracy, poor application effect, complex analysis, etc., achieve simple prediction method, improve prediction quality, and have good application prospects Effect

CN112305602AActive Publication Date: 2021-02-02PETROCHINA CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2021-02-02

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Abstract

The invention provides a carbonatite reservoir prediction method based on a pre-stack multi-attribute and ancient landform fusion technology. The method comprises the following steps: 1) performing rock physical analysis on an area where a layer section to be predicted is located based on drilled well data, and determining pre-stack elastic parameters sensitive to a carbonate reservoir; 2) for theinterval to be predicted, determining a relational expression between the longitudinal wave velocity and the transverse wave velocity based on the drilled well data, determining a relational expression between the density and the longitudinal wave velocity, and then performing pre-stack AVO attribute inversion calculation to obtain specific numerical values of the determined pre-stack elastic parameters sensitive to the carbonate reservoir; 3) respectively determining a current structural form and an ancient landform for the interval to be predicted; and 4) for the interval to be predicted, performing data normalization and fusion processing on each pre-stack elastic parameter obtained by inversion of the determined current structural form, ancient landform and the determined pre-stack AVO attribute, and performing carbonate reservoir prediction by using a fused result.
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Description

technical field

[0001] The invention belongs to the field of petroleum exploration, and relates to a carbonate reservoir prediction technology in the field of seismic data interpretation in petroleum exploration, in particular to a carbonate reservoir prediction method based on pre-stack multi-attribute and paleogeomorphic fusion technology, specifically as follows Using seismic data to interpret multi-attribute fusion technology for carbonate reservoir prediction technology. Background technique

[0002] A variety of geophysical techniques have emerged in carbonate reservoir prediction, including post-stack amplitude attribute analysis, pre-stack AVO analysis, geophysical inversion, waveform classification, spectrum analysis, three-dimensional coherence analysis, and so on. In the 1970s, Ostrander proposed the application of “bright spots” and the AVO analysis technology of the change of the reflection coefficient with the incident angle to predict the reservoir, based on t...

Examples

Embodiment 1

[0046] This embodiment provides a carbonatite reservoir prediction method based on pre-stack multi-attribute and paleogeomorphic fusion technology (technical process reference image 3 ), the area to be predicted is the Cretaceous carbonate strata in the Santos Basin off the coast of Brazil, and the specific process is as follows:

[0047] 1) For the area where the interval to be predicted is located, perform petrophysical analysis based on the drilled data to determine the pre-stack elastic parameters that are sensitive to carbonate reservoirs;

[0048] Petrophysical analysis such as Figure 1A-Figure 1C as shown ( Figure 1A , Figure 1B , Figure 1C are the intersection plots of P-wave impedance, S-wave impedance, μ·ρ and porosity respectively). It can be seen from the figure that carbonate reservoirs generally exhibit high impedance, while non-reservoirs have low impedance. The P-wave impedance, S-wave impedance, and μ·ρ elastic parameters have certain distinctions for ...