Natural gas hydrate saturation estimation method and system

A hydrate and saturation technology, applied in the field of natural gas hydrate saturation estimation methods and systems, can solve problems such as inaccurate results and poor application of EMT equations, and achieve the effect of high estimation accuracy

Pending Publication Date: 2021-07-30
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology

In fact, the distribution states of hydrates in sediments are diverse, and in most cases, various distribution states can coexist. At this time, the EMT equation is not applicable. This equation is used to simulate the velocity of longitudinal and shear waves in hydrate reservoirs and When saturation calculations work, the results are often inaccurate

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  • Natural gas hydrate saturation estimation method and system
  • Natural gas hydrate saturation estimation method and system
  • Natural gas hydrate saturation estimation method and system

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Embodiment Construction

[0072] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0073] The embodiment of the present invention provides a method for estimating the saturation of natural gas hydrate, such as figure 1 shown, including:

[0074] Step 101, obtaining the logging data and elastic parameters of the stratum to be measured; the stratum to be measured includes hydrate intervals and water-saturated intervals; the logging data includes: the depth D of the depth point, the porosity of each depth point Measured longitudinal wave velo...

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Abstract

The invention provides a natural gas hydrate saturation estimation method and system. The method comprises the following steps: acquiring logging data and elastic parameters of a stratum to be measured; respectively calculating a predicted longitudinal wave velocity and a predicted transverse wave velocity of the stratum to be measured; when the error between the predicted longitudinal wave speed of each depth point of the water-saturated layer section and the actually measured longitudinal wave speed of the water-saturated layer section and the error between the predicted transverse wave speed and the actually measured transverse wave speed of the water-saturated layer section are both minimum, determining the critical porosity and the coordination number at the critical porosity; and recalculating the predicted longitudinal wave velocity and the predicted transverse wave velocity of the stratum to be measured, estimating the first hydrate saturation of each depth point according to the recalculated predicted longitudinal wave velocity, estimating the second hydrate saturation of each depth point according to the recalculated predicted transverse wave velocity, and obtaining the hydrate saturation. The method is high in estimation accuracy, and has a positive guiding effect on hydrate reservoir reserve evaluation and subsequent exploration and development.

Description

technical field [0001] The invention relates to the field of estimating the saturation of natural gas hydrate reservoirs, in particular to a method and system for estimating the saturation of natural gas hydrate. Background technique [0002] Natural gas hydrate, referred to as hydrate, also known as "combustible ice", is an ice-state and crystalline clathrate compound formed by natural gas and water under high-pressure and low-temperature environmental conditions. As an unconventional energy source, it has become a hot spot in current energy research because of its huge resources. Quantitative evaluation of gas hydrate reservoirs is the basis for hydrate development and utilization and environmental impact, and accurate prediction of gas hydrate saturation is crucial for quantitative evaluation of hydrate resources. [0003] At present, in areas where drilling data exist, resistivity logging and acoustic logging are effective means for evaluating gas hydrate reservoirs in ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V11/00G06F17/11
CPCG01V11/00G06F17/11
Inventor 张峰武存志李向阳
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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