Abstract: A deep-sea submarine gas hydrate collecting method and a production house for the first time, the collecting method comprises the steps of: determining an active methane leakage zone near a landward limit of a submarine gas hydrate stability zone, acquiring submarine methane leakage in-situ observation data, determining a methane leakage rate and evaluating its economy; mounting a production house on the seabed, opening a monitoring system after the mounting, monitoring the submarine methane leakage condition and hydrate generation progress in real time, evaluating a hydrate generation amount, and performing hydrate acquisition work; and rapidly processing the gas hydrate in the house by a gas hydrate collecting system of an offshore platform, and continuously monitoring the methane leakage condition. A large amount of methane leaked can be collected, thereof, the method has dual meanings of resources and environment.

Abstract: A deep-sea submarine gas hydrate collecting method and a production house for the first time, the collecting method comprises the steps of: determining an active methane leakage zone near a landward limit of a submarine gas hydrate stability zone, acquiring submarine methane leakage in-situ observation data, determining a methane leakage rate and evaluating its economy; mounting a production house on the seabed, opening a monitoring system after the mounting, monitoring the submarine methane leakage condition and hydrate generation progress in real time, evaluating a hydrate generation amount, and performing hydrate acquisition work; and rapidly processing the gas hydrate in the house by a gas hydrate collecting system of an offshore platform, and continuously monitoring the methane leakage condition. A large amount of methane leaked can be collected, thereof, the method has dual meanings of resources and environment.

Abstract: A reconstruction method for a pore structure of a core with micro-CT (Computed Tomography) is provided. With utilizing a FIB-SEM (Focused Ion Beam-Scanning Electron Microscope) experiment, an actual porosity corresponding to a grey level in micro-CT results is obtained, so as to establish a relationship between the grey level of a micro-CT image and the porosity. Thereafter, according to the above relationship, a certain porosity is assigned to each pixel in the micro-CT image, so as to establish a soft segmentation method of the pore structure. The reconstruction method provided by the present invention discloses a soft segmentation method for digital reconstruction of the pore structure of the core combined with FIB-SEM data and micro-CT data, and establishes a fractional digital pore structure model of the core, which further improves a matching degree between the digital pore structure model of the core and an actual core.

Abstract: An isotope nuclear magnetic method for analyzing ineffective water absorption of rock pores includes steps of: saturating core pores of a core sample with a wetting phase fluid of water H2O, and obtaining a core T2 spectrum after being saturated with the water; re-saturating the core pores with a wetting phase fluid of heavy water D2O, and obtaining a rock baseline T2 spectrum; injecting fluorinated oil into the core sample saturated with the heavy water; injecting the water H2O, simulating a water injection process, and injecting the fluorinated oil, so as to analyze a content of immobile water and obtain a residual T2 spectrum, wherein a range formed by a difference between the residual T2 spectrum and the rock baseline T2 spectrum is an ineffective water absorption portion of the rock pores, and an ineffective water absorption amount is obtained.

Abstract: An isotope nuclear magnetic method for analyzing ineffective water absorption of rock pores includes steps of: saturating core pores of a core sample with a wetting phase fluid of water H2O, and obtaining a core T2 spectrum after being saturated with the water; re-saturating the core pores with a wetting phase fluid of heavy water D2O, and obtaining a rock baseline T2 spectrum; injecting fluorinated oil into the core sample saturated with the heavy water; injecting the water H2O, simulating a water injection process, and injecting the fluorinated oil, so as to analyze a content of immobile water and obtain a residual T2 spectrum, wherein a range formed by a difference between the residual T2 spectrum and the rock baseline T2 spectrum is an ineffective water absorption portion of the rock pores, and an ineffective water absorption amount is obtained.

Abstract: A reconstruction method for a pore structure of a core with micro-CT (Computed Tomography) is provided. With utilizing a FIB-SEM (Focused Ion Beam-Scanning Electron Microscope) experiment, an actual porosity corresponding to a grey level in micro-CT results is obtained, so as to establish a relationship between the grey level of a micro-CT image and the porosity. Thereafter, according to the above relationship, a certain porosity is assigned to each pixel in the micro-CT image, so as to establish a soft segmentation method of the pore structure. The reconstruction method provided by the present invention discloses a soft segmentation method for digital reconstruction of the pore structure of the core combined with FIB-SEM data and micro-CT data, and establishes a fractional digital pore structure model of the core, which further improves a matching degree between the digital pore structure model of the core and an actual core.