米仓—大巴山复杂山前带油气勘探进展与面临的问题研究
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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。
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.
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.
引文
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[2]张国伟,张本仁,袁学诚.秦岭造山带与大陆动力学[M].北京:科学出版社,2001:1-855
[3]王家林,王一新,万明浩.石油重磁解释[M].北京:石油地质出版社,1991:1-373
[4]马力,陈焕疆,甘克文.中国南方大地构造和海相油气地质[M].北京:地质出版社,2004:1-867
[5]马永生,蔡勋育,李国雄.四川盆地普光大型气藏基本特征及成藏富集规律[J].地质学报,2005,79(6): 858-865
[6]贾承造,何登发.前陆冲断带油气勘探[M].北京:石油工业出版社,2000:56-59
[7]张庆龙,卢华复.大巴山前缘含油气构造条件[J].天然气工业,1995,15(4):5-9
[8]王一刚,刘划一,文应初.川东北飞仙关组鲕粒滩储层分布规律、勘探方法与远景预测[J].天然气工业, 2002,22(增刊):14-19
[9]吴世祥,汤良杰,郭彤楼,等.米仓山与大巴山交汇区构造分区与油气分布[J].石油与天然气地质,2005, 26(3):361-365
[10]韩应钧,丁玉兰.龙门山、米仓山、大巴山及其前缘带石油天然气远景预测[J].天然气勘探与开发,2002, 25(1):19-23
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