【摘要】 随着川东北普光特大型天然气田的发现和元坝大型气田的逐步落实,为进一步扩大天然气资源规模,向更加复杂的山前带推进并扩大勘探领域已势在必行。米仓大巴山复杂山前带位于四川盆地东北部,地面地质调查及区域沉积相研究表明,在米仓山南缘——南江探区东部、黑池梁东部和大巴山前缘——镇巴探区存在二叠系和三叠系台地边缘沉积相带,属于油气有利勘探区域。近年来,针对米仓山前缘实施了大规模二维和三维地震勘探,取得了丰富的勘探成果,为进一步落实川东北二叠系和三叠系台缘礁滩相带北端的具体走向奠定了基础。2007—2008年实施的金溪1井的成功钻探证实了该区油气保存条件良好、油气显示活跃、具有良好的勘探潜力。位于大巴山逆冲推覆前缘变形带上的镇巴探区受多期次大型造山运动的强烈改造,地下地质构造极其复杂,经过多轮综合物探和地震方法攻关,资料品质得到改善,地质认识不断深化。更多还原

【Abstract】 Along the discovery of Puguang gasfield and the identification of Yuanba gasfield in Northeast Sichuan Basin,further enhancement of natural gas resource and the exploration in more complex mountain front is imperative.Micang-Dabashan mountain front is located in the Northeast of Sichuan Basin,the surface geologic investigation and regional sedimentary facies research show that favorable exploration area includes Permian and Triassic platformedge sedimentary facies belt,which is distributed in the north edge of Micangshan area—east of Najiang area,east of Heichiliang area, as well as front of Dabashan area—Zhenba area.In the recent years,amount of 2-D and 3-D seismic exploration were implemented in the front of Micangshan,and abundant results were achieved, which provides good basis for further ascertaining the strike of Permian and Triassic northward platform-edge beech-reef facies belt in Northeast Sichuan Basin.2007-2008,the successful drilling of Jinxil well proved its good storage condition and good hydrocarbon show,which indicates good exploration potential.Zhenba area is situated at the deformable zone of thrusting overriding front in Dabashan area,which has been reformed by multi-phase large-scale orogeny, its subsurface geologic structures are extremely complex. After several times of integrated geophysical and seismic exploration tackling,the quality of seismic data was improved and the geologic recognition was deepened.更多还原