Micro-stratigraphical Model of Coal Seam and Its Application To Evaluation of Coal Reservoirs, Physical Property
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摘要: 应用马尔柯夫过程的原理和方法，建立起描述煤层形成过程或显微序列的数学模式，进而通过对研究实例中煤层结构以及煤岩分层孔比表面积的模式拟合，可以模拟出各种显微煤岩类型在煤层中的分布部位以及煤层中煤层甲烷的有利储存部位，对厚煤层物性和储气性能的非均质性特征作出预测，为煤层气开采地质条件评价提供了一条新的思路。Abstract: Based on the principle and method of M arkov Chain, the methematic model w as established in o rder to describe the forming process and the micro-sequence of coal seam, The follow ing conclusions have been draw n: (1) The test values are far more greater than the ci tical points at different confidence levels, the microlithoty pe sequence of coal seam is fi t to the Markov Process.(2)The statistic direction of the microlithoty pe sequence w ithin each sublayer has hardly effiect on the analy sis result.(3)The thickness of the main states will be in- creased and that of the secondary decreased during the simulation of microlithoty pe sequence.This thickness change will make the simulating microlithotype sequence simple and clear.(4)The location of each microli tho- type fo r a case w as defined through the model fitting to coal structure, so the heterogeneous characteristics of coalbed methance(CBM)w ere predicated.(5) The advantageous gas-storaging location in the coal seam can be forecasted by combining the anslysis of the specific surface area of pore and the gas-storaging capaci ties of the different macerals w ith the microli thotype sequence of coal seam.So a new insight to evaluation on geologi- cal conditions of CBM development has been given.
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Key words:
- Markov Chain /
- micro-sequence of coal seam /
- coal reservoir /
- pore surface area /
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