Method for quantitatively recovering carbonate rock stratum denudation quantity

A technology of stratum denudation and carbonate rock, which is applied in the field of oil and gas exploration, can solve problems such as difficult to find vitrinite, unsuitable for carbonate strata, and inability to accurately calculate the amount of stratum denudation, so as to achieve accurate thermal history restoration , Calculate the effect of accurate and quantitative, accurate and fast calculation

Active Publication Date: 2015-11-11
PETROCHINA CO LTD
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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 for

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  • Method for quantitatively recovering carbonate rock stratum denudation quantity
  • Method for quantitatively recovering carbonate rock stratum denudation quantity
  • Method for quantitatively recovering carbonate rock stratum denudation quantity

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Embodiment

[0044] This embodiment provides a method for quantitatively recovering the denudation amount of the carbonate strata, taking the restoration of the stratum denudation amount of the Maokou Formation in the Sichuan Basin as an example, as follows figure 1 shown, including the following steps:

[0045] (1) Systematic sampling of field outcrops and rock cores in the entire Sichuan Basin, selecting outcrop sections with relatively complete strata, and taking one sample per meter.

[0046] (2) Carry out conodont analysis and determination to the sample collected in step 1, carry out conodont classification to the sample collected, and analyze, identify and identify each classification;

[0047] Conodont sequences forming a single outcrop or well;

[0048] Referring to the existing conodont identification standards, a complete conodont sequence map of a single outcrop or well in a research area is formed according to the species, such as figure 2 shown;

[0049] Compare the conodon...

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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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Application Information

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IPC IPC(8): G01V9/00
Inventor 江青春姜华石书缘卞从胜徐兆辉
Owner PETROCHINA CO LTD
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