澳大利亚鲍恩盆地冲断带煤层气构造控气特征研究

发布时间：2018-10-08 07:50

【摘要】：为了明确前陆盆地山前冲断带构造对煤层气富集的控制作用,以澳大利亚鲍恩盆地为例,利用地震资料解释结果和煤层气试验分析数据,对构造控气模式进行了精细研究和量化表述,探讨不同构造下煤层含气性差异的原因,并阐明富集模式机理。研究结果表明:经过多阶段演化形成的构造特征是前陆盆地冲断带煤层气富集的主控因素,叠瓦构造煤层含气量随埋深增加而增大,该构造低洼区是最常见的煤层气富集区;断后向斜和冲起-三角构造的埋深大,挤压应力强,含气量高,为15~20m~3/t;蛇头构造与断弯背斜受构造受抬升影响严重,局部拉张使得应力得到释放,气体散失,含气量小于10 m~3/t。得出了构造对煤层气富集的控制作用方式,提出前陆盆地冲断带的叠瓦斜坡富集区、断后向斜富集区、对冲-三角富集区为今后煤层气勘探关键区域。
[Abstract]:In order to clarify the controlling effect of Foreland basin Foreland thrust belt structure on coalbed methane enrichment, taking the Bao En Basin of Australia as an example, the seismic data are interpreted and the coalbed methane experimental analysis data are used. The detailed study and quantitative expression of the structural gas-controlling model are carried out, and the reasons for the difference of the gas-bearing characteristics of the coal seam under different structures are discussed, and the mechanism of the enrichment model is clarified. The results show that the structural characteristics formed by multi-stage evolution are the main controlling factors of coalbed methane enrichment in thrust belt of Foreland basin, and the gas content of the imbricate structure coal seam increases with the increase of buried depth, and the low-lying area of the structure is the most common coalbed methane accumulation area. The post-fault syncline and fault-to-triangle structure have large burying depth, strong compressive stress and high gas content, which are 1520mt / t, the Shetou structure and fault-bend anticline are seriously affected by the uplift, the local tension releases the stress and the gas is dissipated, and the gas content is less than 10mct / t. The controlling mode of structure on coalbed methane enrichment is obtained, and it is proposed that the rich area of overlay slope, post-fault syncline and hedge-triangle rich area in thrust belt of Foreland basin are the key areas of coalbed methane exploration in the future.
【作者单位】：中海石油气电集团有限责任公司;
【基金】：中海石油气电集团科研课题资助项目(QDKY-2017-YFZX-12)
【分类号】：P618.13

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