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我国煤层气资源非常丰富,鄂尔多斯盆地东部地区是我国煤层气勘探开发的重点区域,随着勘探程度的不断提高,地震勘探已经成为煤层气储层评价的有效方法之一.本文研究了午城地区煤层气储层的地球物理特征以及富聚成藏条件,利用人工合成地震记录进行煤层顶部层位标定,依据该区测井速度资料、地震资料,根据煤层地球物理特征,准确预测出煤层厚度,经过横向外推得出午城地区煤层展布特征,结合该区构造条件,煤层厚度、成熟度和空隙特征以及盖层条件,确定出该区煤层气勘探开发的重点有利区.研究结果显示:鄂尔多斯盆地东部的午城地区煤层气勘探的主力煤层厚度较大且分布稳定,5~#煤层总厚度为2~7 m,个别达8 m;8~#煤层总厚度为2~8 m,最厚层段达10 m,总体埋深低于1500 m,北厚南薄,从东到西埋藏深度逐渐加大.预测出两主力煤层的煤层气富集区各3个,保存条件较好,非常有利于煤层气的勘探开发.
CBM resources are abundant in our country, and the eastern part of Ordos Basin is a key area for CBM exploration and development in our country.With the continuous improvement of exploration, seismic exploration has become one of the effective methods for CBM reservoir evaluation.In this paper, Based on the geophysical characteristics of CBM reservoirs and the conditions of enrichment and accumulation, the authors make use of synthetic seismic records to calibrate the top of coal seams. According to the logging velocity data and seismic data in this area, accurately predict the thickness of coal seams based on the geophysical characteristics of coal seams, Based on the tectonic conditions, coal seam thickness, maturity, voids characteristics and caprock conditions in the area, the key favorable areas for CBM exploration and development in this area are determined by horizontal extrapolation.The results show that: The thickness of the main coal seam in CBM exploration in the urban area in the east of Ordos Basin is large and stable. The total thickness of coal seam 5 ~ # is 2 ~ 7 m, and the individual thickness is 8 m. The total thickness of coal seam 8 ~ # is 2 ~ 8 m The thick interval reaches 10 m with an overall burial depth of less than 1500 m, and the north and south are thin and the burial depth gradually increases from east to west. Three CBM enrichment zones are predicted for each of the two main coal seams, Good, very conducive to exploration and development of coalbed methane.