High-resolution multi-frequency array resistivity logging physical simulation method of gas hydrate-bearing sediment
A hydrate sediment and resistivity logging technology, which is applied in the direction of measuring devices, analyzing materials, and material analysis by electromagnetic means, can solve the problems of lack of logging experiment calibration, inability to obtain saturation information, and less detection information
Inactive Publication Date: 2019-11-26
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology
However, most of the existing methods are based on dual laterolog data. Due to the lack of detection information and weak radial stratification ability, the saturation information of different radial detection ranges around the wellbore cannot be obtained, and the calibration of well logging experiments is lacking. There are bugs in the application
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[0030] The present invention proposes a multi-frequency array resistivity logging physical simulation method for gas hydrate-bearing deposits, and constructs a gas hydrate-bearing formation with multi-layer simulation capabilities according to the complex geological characteristics and filling characteristics of gas hydrate-bearing deposits , using optimized array electrode layout and numerical focus signal processing methods, the physical simulation of multi-frequency array resistivity logging of gas hydrate under laboratory conditions was carried out, and the resistivity profiles at different radial detection depths around the well were obtained and inverted into Saturation information is of great significance for fine logging identification and characterization of hydrates.
[0031] figure 1 It is a schematic structural diagram of an embodiment of the high-resolution multi-frequency array resistivity logging physical simulation system for gas hydrate-containing deposits inv...
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Abstract
The invention discloses a high-resolution multi-frequency array resistivity logging physical simulation method of a gas hydrate-bearing sediment. The method comprises the following steps: a) preparinga stratum model according to geological background and the like of a study area, and placing the stratum model into a reaction kettle of a gas hydrate generation system; b) drilling a borehole modelin the center of the stratum model; c) making the stratum model fully saturated to simulate formation water; d) through a gas injection and control system of the gas hydrate generation system, injecting the gas into the reaction kettle, and meanwhile, monitoring pressure and gas consumption in the system till meeting predetermined conditions; and e) placing the reaction kettle in a refrigeration house, reducing the temperature of the refrigeration house to 1 DEG C and maintaining the temperature for 2 hours, and then, inserting a high-resolution multi-frequency array resistivity meter into a borehole to connect with a signal acquisition and data processing system. The method can simulate basic properties of sediments with different lithology, physical properties and particle sizes and thelike and multi-frequency array resistivity response characteristics of the hydrate-bearing sediment under composition conditions.
Description
technical field [0001] The invention belongs to the field of energy exploration and development and geophysical logging, in particular to a high-resolution multi-frequency array resistivity logging physical simulation method for deposits containing natural gas hydrate. Background technique [0002] Natural gas hydrate is the most valuable clean resource known so far, equivalent to twice the global conventional coal, oil, and natural gas resources, and is known as a clean alternative fuel in the 21st century. The potential of natural gas hydrate resources in my country is huge, and the amount of natural gas hydrate resources in the South China Sea is estimated to be more than 70 billion tons of oil and gas equivalent. Early development and utilization of natural gas hydrate resources to seize the strategic commanding heights of future global energy development is of great strategic significance to national energy security and economic security. [0003] As an important means...
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IPC IPC(8): G01N27/04
CPCG01N27/041
Inventor 葛新民金强范宜仁邓少贵魏周拓邢兰昌李智强刘建宇
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)