Method of quickly recovering paleo-water-depth of carbonate platform

Abstract

The invention relates to a method of quickly recovering paleo-water-depth of a carbonate platform in the field of petroleum exploration and development technologies. According to the method, a high-energy particle beach is judged through comprehensive analysis of sedimentary lithology, a biomarker, a sedimentary structure and other identification signs, and a shallow water environment and a relatively deep water environment are identified with the beach being an origin; then the particle beach is further refined through particle content, a particle type and a cementing mode, and paleo-water-depth assignment is performed on the particle beach according to tidal law statistical analysis and wave hydrodynamic analysis on all elements (the sedimentary lithology, the biomarker, the sedimentarystructure and other identification signs as well as the particle content, the particle type and the cementing mode); and last, the different elements are subject to weighted integration, paleo-water-depth recovery values at different positions of the whole platform are obtained through formula calculation, then a paleo-water-depth planar spreading map of the carbonate platform is obtained, and therefore the purpose of quick recovery is achieved. The method lays a reliable geological foundation for palaeoenvironment analysis and reservoir formation and distribution research.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploration and development, and in particular relates to a method for quickly recovering the ancient water depth of a carbonate rock platform. Background technique [0002] Paleo-depth refers to the height difference between the top surface of the sediment and the base level of the sea level (sea level, lake level, equilibrium), reflecting the size of the sedimentary accommodation space. Paleo-depth restoration is one of the important basic contents of basin analysis, sequence stratigraphy research, and paleogeomorphology restoration, and it is of great significance for reconstructing the paleo-environment and basin structure of sedimentary basins. With the continuous advancement of technology, paleowater depth restoration technology has also made great progress, and research methods have become more and more diverse, but these methods are based on the two basic methods of formation thickness m...

AI Technical Summary

Problems solved by technology

[0004] The above two methods are mostly used in the deposition of clastic rocks. Because the deposition rate is closely related to the paleowater depth, the formation thickness method can be well applied. However, due to the special development period and environmental conditions of the carbonate platform, different depositional The sedimentation rate of facies varies greatly, and it cannot be judged only based on the single factor of sedimentation rate, and in the case of incomplete logging, seismic and other data, the geochemical results are also inaccurate, so the above methods have certain limitations sex

Especially compared with the complex and cumbersome calculation process, the actual application is more complicated and takes a long time, so a faster and more applicable new method is needed for relatively simple and fast recovery

Images