A Quantitative Analysis Method for the Phase and Intensity of Deepwater Thrust Folding

Abstract

The invention relates to a quantitative analysis method for the active stage and activity intensity of deep water thrusting folds. The method comprises the following steps: step one, determining top and bottom interfaces of a piggyback type micro basin, determining activity time of a deep water thrusting fold, comparing the activity time with hydrocarbon generation and expelling time of an oil-gassource rock, and determining whether the deep water thrusting fold has a favorable oil and gas trap preliminarily; step two, determining the fold-back number of times of upper exceeding points and determining an active stage of the deep water thrusting fold; step three, at each active stage of the deep water thrusting fold, selecting any two upper exceeding points and reading geodetic coordinatesand depths of the upper exceeding points as well as geodetic coordinates and depths of thickness points of stratums corresponding to the two upper exceeding points; step four, calculating a distancea of the upper exceeding points and thicknesses b of the stratums corresponding to the two upper exceeding points; an step five, calculating a growth angle alpha being equal to arcsin(a / b), representing the activity intensity of the deep water thrusting fold quantitatively by using the growth angle alpha, comparing the activity intensity with the hydrocarbon generation and expelling history of theoil-gas source rock, and thus determining whether the deep water thrusting fold has a favorable oil and gas trap finally.

Description

technical field [0001] The invention relates to a quantitative analysis method for deep water thrust fold activity phase and activity intensity, which belongs to the field of petroleum and natural gas exploration. Background technique [0002] Since the 1990s, the continuous discovery of global deepwater giant oil and gas fields has become an important part of the growth of international oil and gas production and reserves, and there is a growing trend. Deep water thrust fold is one of the important structural types in deep water oil and gas exploration. At present, the research on the activity time, activity period and activity intensity of deep-water thrust folds is still in its infancy in the industry. The existing technologies mainly focus on the classification, geometric characteristics and formation mechanism of deep-water thrust folds, but there is still There is no effective method to quantitatively analyze the formation and evolution process of deep-water thrust fo...

AI Technical Summary

Problems solved by technology

The active characteristics of thrust faults do not represent the active characteristics of thrust folds, so they cannot be used to analyze deep-water thrust folds

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