Method for evaluating quality of marine natural gas hydrate reservoir
A technology of natural gas and hydrate, which is applied in the field of evaluating the advantages and disadvantages of marine natural gas hydrate reservoirs. It can solve the problems that restrict the exploration of natural gas hydrate and the accurate assessment of resources, and cannot satisfy the research on natural gas hydrate accumulation, and achieves accuracy and efficiency. Evaluation effect
Inactive Publication Date: 2020-04-10
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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The understanding of the advantages and disadvantages of marine gas hydrate reservoirs is still mainly based on the physical properties of marine sediments, especially the distribution of their particle size components, to classify them as clay, silty or sandy, etc. to qualitatively judge their reservoirs. The advantages and disadvantages of the gas hydrate layer cannot meet the needs of more in-depth research on gas hydrate accumulation, and restrict the exploration of gas hydrate and the accurate assessment of resources.
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[0032] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0033] Such as figure 1 As shown, a method for evaluating the quality of marine gas hydrate reservoirs in this embodiment includes the following steps:
[0034] Step 1: Prepare samples. Drilling cores of marine sediments to prepare reservoir sections containing gas hydrates (usually from the seabed to several hundred meters below the seafloor, gas hydrates are not present in the entire sedimentary layer, but only in an uncertain depth range, containing gas A certain range of gas hydrate is the gas hydrate-bearing reservoir section), and it is necessary to conduct drilling sampling at different positions in the target area of the marine sediment layer according to the accuracy requirements. Drill cores for each columnar marine ...
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The invention discloses a method for evaluating the quality of a marine natural gas hydrate reservoir. The method comprises the steps: S1, acquiring columnar marine sedimentary layer drilling rock cores at different positions of a target region, carrying out the drilling of each columnar marine sedimentary layer drilling rock core, and preparing a plurality of samples at certain intervals in the axial direction of a natural gas hydrate reservoir section; S2, measuring the surface area of each sample; S3, constructing a sedimentary sample pore size calculation model; S4, constructing a calculation model of the solidification temperature variation of the natural gas hydrate in a pore state; and S5, calculating the solidification temperature change amount of the natural gas hydrate in each sample to obtain three-dimensional distribution of the solidification temperature change amount of the marine natural gas hydrate reservoir and obtain the advantages and disadvantages of the marine natural gas hydrate reservoir. The method comprehensively analyzes the influence of the distribution of the natural gas hydrate and the marine sediments on the stability condition of the natural gas hydrate to realize accurate evaluation of the quality of the marine natural gas hydrate reservoir.
Description
technical field [0001] The invention relates to the field of natural gas hydrate accumulation, in particular to a method for evaluating the quality of marine natural gas hydrate reservoirs. Background technique [0002] Natural gas hydrate is an ice-like solid compound composed of gas (mainly methane) and water, and its existence depends on the van der Waals force between light hydrocarbon gas molecules and water molecules as guest molecules at low temperature and high pressure. Each cubic meter of methane hydrate contains about 164 cubic meters of standard state gas and 0.8 cubic meters of water. According to conservative estimates, the natural gas hydrate content is 21×10m 3 , which is almost twice the amount of fossil energy known on Earth, is considered an ideal alternative to fossil energy in the 21st century. Based on its possible huge resources, natural gas hydrate has become the focus of scientific research in recent years, and the energy, environment and disaster ...
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IPC IPC(8): G01N33/24
CPCG01N33/24
Inventor 张辉苏正
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI