A quick method for recovering paleowater depth of carbonate platform

Abstract

The invention relates to a method for quickly recovering the ancient water depth of a carbonate rock platform in the technical field of petroleum exploration and development. This method judges the high-energy grain shoal through the comprehensive analysis of sedimentary lithology, biological markers, sedimentary structure and other identification marks, and uses the shoal as the origin to identify shallow water environment and relatively deep water environment, and then further analyzes the grain shoal through the grain content, grain type and cementation method Refining, assigning paleo-depth values ​​to all elements (sedimentary lithology, biomarkers, sedimentary structure and other identification marks, particle content, particle type and cementation mode) according to tidal law statistics and wave hydrodynamic analysis, and finally weighting different elements Integrate, calculate and obtain paleo-depth recovery values ​​at different positions of the entire platform through formula calculation, and then obtain the paleo-depth plane distribution map of the carbonate platform, so as to achieve the purpose of rapid recovery. It has laid a reliable geological foundation for paleoenvironmental analysis and research on the origin and distribution of reservoirs.

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...

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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

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