Platform-terrace facies thick-layer limestone sedimentary facies depicting and predicting system and predicting method

Abstract

The invention provides a platform facies thick layer limestone sedimentary facies depicting and predicting system and method. The platform facies thick layer limestone sedimentary facies depicting and predicting system comprises a single well relative dominant facies determining module, a multi-attribute fusion seismic facies predicting module and a seismic facies predicting module. The single well relative dominant facies determination module comprises a single well sedimentary microfacies identification module and a single well relative dominant facies determination module; and the single well sedimentary microfacies identification module is used for dividing sedimentary microfacies on a single well by inputting and observing related information of sedimentary microfacies types in a limestone sedimentary system determined by rock cores, rock slices and ancient biomarkers and combining well logging interpretation with a facies law. And the type of the sedimentary microfacies in the layer is analyzed, and the relative proportion of the thickness of the beach facies and the thickness of the non-beach facies (the sedimentary microfacies except the beach) on the single well is calculated. According to the method, the problems that quantitative analysis cannot be realized and multiple solutions exist in sedimentary microfacies prediction in a reservoir with relatively small lithology change are solved.

Description

technical field [0001] The invention belongs to the application field of seismic attributes, and in particular relates to a platform facies thick limestone sedimentary facies description and prediction system and prediction method. Background technique [0002] Limestone developed in the carbonate platform background usually has a wide distribution area and many types of sedimentary facies belts, but the difference in lithology is small (all are limestone). When using conventional single-factor seismic facies to predict the deposition of thick limestone It is usually difficult to accurately characterize the distribution of sedimentary microfacies during phase distribution. Prediction of sedimentary facies through seismic attributes, there is a complex relationship between each attribute and the target object, and the sensitivity of seismic attributes to the target to be predicted is not completely the same in different reservoirs. Sometimes, even in the same work area and r...

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Problems solved by technology

[0002] Limestone developed in the carbonate platform background usually has a wide distribution area and many types of sedimentary facies belts, but the difference in lithology is small (all are limestone). When using conventional single-factor seismic facies to predict the deposition of thick limestone It is usually difficult to accurately characterize the distribution of sedimentary microfacies during facies distribution

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