Analysis method of stratigraphic evolution law in sedimentary basin

Abstract

The invention discloses a stratum evolution rule analysis method of a sedimentary basin. The method comprises that a seismic profile of the target sedimentary basin is obtained; and an evolution ruleof two adjacent stratums in whole region distribution is obtained according to positions, relative to the lake basin, of seismic interpretation axes corresponding to sand in different layers between the two adjacent stratums in the seismic profile. When the seismic interpretation axis of the sand in the upper layer moves to the center of the lake basin relative to the seismic interpretation axis of the sand in the lower layer, the sand in the upper layer is formed by sediment via a lake basin shrinkage process; and when the seismic interpretation axis of the sand in the upper layer moves to the edge of the lake basin relative to the seismic interpretation axis of the sand in the lower layer, the sand in the upper layer is formed by sediment via a lake basin expansion process. According tothe analysis method, the sand evolution rules between the two adjacent stratums can be obtained on the basis of sedimentary facies of the stratums in whole region distribution, more geologic information can be obtained, and well disposition is helped.

Description

technical field [0001] The invention relates to the technical field of petroleum exploration, in particular to a method for analyzing the law of formation evolution in sedimentary basins. Background technique [0002] Both oil and natural gas are generated and stored in sedimentary basins. It is of great guiding significance for oil and gas exploration and development to search for main sand bodies by studying the sedimentary facies of various strata in sedimentary basins. [0003] At present, the analysis and research of sedimentary facies are all based on seismic data. Seismic facies diagrams are obtained by processing seismic data, and sedimentary facies are analyzed according to the characteristics of seismic facies presented in the seismic facies diagrams. For example, the sedimentary facies corresponding to parallel-chaotic reflection weak-medium amplitude low-medium continuous earthquakes are inherited main channels in alluvial plains and deltas; wedge-shaped chaotic...

AI Technical Summary

Problems solved by technology

[0004] In the process of realizing the present invention, we found that the prior art has at least the following technical problems: the current research on the sedimentary facies of sedimentary basins is a separate study on the sedimentary facies formed in each geological period, which is a characterization of an epoch, and only for the whole Research on the sedimentary facies of strata distributed in different regions, such a research method will miss a lot of geological information, which is not conducive to oil and gas exploration and development

Images