在经历30多年的辉煌以后，辽河油区天然气勘探开发已经面临严重的局面：后备资源严重不足、主力产气区进入开发末期，稳产难度越来越大。
More than 30 years splendid history has been experienced, t he serious prospecting and development situation of natural gas has been facing by Liaohe Oilfield.
分析认为：研究区煤层气含量各煤层差异性较大，埋深、原煤挥发分、原煤水分、灰分产率等因素对煤层气含量均有一定的影响。
Factors such as buried depth, volatile matter of raw coal, water content and ash content in raw coal can produce influence upon gas content to some extent.
天然气资源评价重点参数主要包括产气率、运聚系数、区带评价参数与可采系数等4项。
There are mainly 4 key parameters of natural gas resource evaluation, including gas production rate, migration-accumulation coefficient, play evaluation parameters, and recovery rate.
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