Method for quantitatively recovering carbonate rock stratum denudation quantity

Abstract

The invention discloses a method for quantitatively recovering carbonate rock stratum denudation quantity, comprising steps of performing system sampling on the field outcrop and corestone, performing analysis and measurement on the conodont to form a conodont sequence, forming a complete conodont sequence plate in a research area, performing conodont sequence comparison to determine a stratum deletion region and a stratum non-deletion region, sorting out single-well GR curves of the stratum deletion region and the stratum non-deletion region, performing Fourier changing on the GR curve which has gone through the non-deletion region decomposition to carry out time-frequency transformation so as to obtain the frequency of gyration of different levels, determining gyration of various levels to determine gyration thickness of the corresponding level, determining stratum gyration number of various levels, determining complete stratum depositing time, performing calculation on the -deletion region to obtain the gyration frequency, rotation time and rotation thickness of various levels, utilizing the ratio of the non-deletion complete depositing time to the deletion region alternative level gyration time to obtain an original stratum thickness and performing difference calculation on the original stratum thickness and the current residual thickness.

Description

technical field [0001] The invention relates to a method for quantitatively restoring the denudation amount of a carbonate rock formation, and belongs to the technical field of petroleum gas exploration. Background technique [0002] The oil and gas resources in the global marine carbonate formations are close to 50% of the global oil and gas reserves. Recently, my country has also made major discoveries in the three marine formations of Tarim, Sichuan and Ordos, revealing the huge potential of oil and gas exploration in marine formations. potential. However, statistics show that 40% of the carbonate formations have different degrees of denudation and loss, and the denudation and loss of formations affect the thermal history of the formations, which in turn affects the generation and migration of oil and gas. At the same time, the denudation of carbonate rock formations generally leads to the formation of karst reservoirs, and karst reservoirs are extremely important oil and...

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Problems solved by technology

[0004] However, the first three methods are mainly based on qualitative analysis, which cannot accurately calculate the amount of formation erosion; while the thermal history analysis method of acoustic transit time difference paleotemperature scale is based on the analysis of vitrinite reflectivity, it is generally difficult to find vitrinite in carbonate formations. plastid, so it is not suitable for carbonate formations; therefore, the current recovery methods of carbonate formation denudation are either non-quantitative analysis, or only suitable for accurate restoration of clastic formation denudation, so it is urgent to establish carbon Quantitative Restoration Method of Erosion Amount in Salt Rock Formation

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