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摘要: 煤层气系统研究能有效地指导煤层气勘探和开发。运用非常规含油气系统的理论和方法，研究了阜新盆地沙海组煤层气地质特征。沙海组三段煤层是研究区煤层气的生储层；沙海组四段泥岩、泥质粉砂岩作为沙海组三段煤层气的盖层，是良好的区域性盖层；上覆岩层是沙四段泥岩和阜新组地层；由于喜山期辉绿岩的侵入，沙海组煤层在古近纪末出现生气高峰，另外，后期盆地抬升，地下水作用带入细菌导致煤层产生大量次生生物气；此后，煤层气进入保存阶段，煤层气系统的关键时刻是古近纪末。以上表明，盆地东梁区白垩系沙海组煤层适合进行煤层气勘探和开发，有望成为煤层气勘探开发的接续区域。Abstract: The investigation on the coalbed methane system is a guide to the exploration and development of coalbed methane. Using the theory and method of unconventional petroleum system, the Sahai Formation coalbed methane system was studied. The source and reservoir rock is the third coal seams of Sahai Formation. The Sahai Formation coalbed methane is sealed by the roof comprising mudstone and lutite of the fourth Sahai Formation. The overburden is the fourth Sahai Formation and Fuxin Formation deposits. The dolerite intrusion during the Himalayan orogeny enhanced the coal maturity and caused a peak of hydrocarbon generation. In addition, the underwater brought many bacteria generating second biogenic methane. Then the coalbed methane is reserved and a critical moment of the coalbed methane system is at the end of the Late Tertiary. In summary, the Sahai Formation coal seams are favorable for coalbed methane exploration and the Dongliang district will to be a promising area for coalbed methane exploration.
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Key words:
- coalbed methane system /
- Cretaceous /
- Sahai Formation /
- Fuxin Basin
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