Sedimentary formation unit-based seismic facies analysis method

Abstract

The invention belongs to the technical field of oil gas and coal-bed gas seismic exploration and development, and in particular relates to a reservoir sedimentary evolution analysis method in the exploration and development process. The method is used for providing reliable basic data for optimizing favorable target bed series and zone for oil gas and coal-bed gas exploration and development. In the method, sedimentary characteristics of reservoirs are analyzed by a three-dimensional seismic attribute data body, and high-resolution sequence stratigraphic principle and method, a seismic attribute analysis method and a pattern recognition method are applied; and a K-mean clustering algorithm is adopted, and the analysis process of sedimentary characteristics and sedimentary evolution of a sedimentary formation unit is performed under the control of a sedimentary isochronous interface. The method is used for assisting in reservoir sedimentary evolution research work in the exploration and development process of oil gas including unconventional oil gas, guiding the description of sedimentary characteristics of fine reservoirs of lithologic and stratigraphic trapped oil gas reservoirs, and providing the reliable basic data for optimizing the favorable target bed series and zone for the oil gas and coal-bed gas exploration and development.

Description

technical field [0001] The invention belongs to the technical field of seismic exploration and development of oil and gas and coalbed methane, and in particular relates to a method for analyzing reservoir sedimentary evolution in the process of exploration and development, and provides reliable basic data for selecting favorable target formations and zones for oil and gas and coalbed methane exploration and development . Background technique [0002] The study of sequence stratigraphy has promoted the development of genetic stratigraphy research. The complexity of oil and gas exploration targets requires attention to the details of the depositional environment and depositional evolution of the target interval. With the advancement of seismic technology, especially the seismic attribute analysis technology, the sedimentary interpretation using seismic data has taken a step forward. In the interior of macroscopic sedimentary sequences, seismic data can be used to study smaller...

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Problems solved by technology

[0006] At present, the technical methods of using seismic data for seismic facies analysis are all traced in the reflection time domain of the earthquake or with a certain time window. In the process of geological evolution, it will also be affected by tectonic movement, and there are differences in sedimentary thickness and structural shape. If equal-length time windows are used, it will inevitably cause different sedimentary units corresponding to different traces of data, and the seismic data of different sedimentary units will be different. The data are combined for seismic attribute analysis and seismic facies interpretation, and the interpretation results obtained are difficult to be consistent with the actual sedimentary strata’s spread characteristics, and the seismic attribute analysis lacks clear geological significance

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