论文部分内容阅读
在龙门山推覆构造带东缘的盆地区中已发现了多个具有一定规模的气田,但在推覆带上还未有突破。由于龙门山逆掩断裂带地理条件十分恶劣,地震勘探很难得到好的地震反射资料,难以查清推覆构造带下的构造形态,阻碍了该区油气资源的勘探进程。2003年在龙门山构造带北段广元地区开展的“变线元多线(宽线)剖面采集”试验,于龙门山“前、后山带”获得了相当好的地震反射剖面,在推覆带发现了保存完好的大型背斜构造。从山前带的东边界开始,这一隐伏构造带向西延展的宽度在25 km以上,直到后山带的中段。隐伏构造的发现,使近期在该区找到大型油气田的希望成为现实。文章依据断层相关褶皱理论模式对宽线剖面进行综合解释,结合区域地质研究成果解析了龙门山构造北段的变形历史。
Several gas fields with a certain size have been found in the basin area on the eastern margin of the Longmen Shan nappe belt. However, no break has been made in the thrust belt. Due to the terrible geographical conditions of the Longmen Shan thrusting fault zone, it is difficult to obtain good seismic reflection data for seismic exploration. It is difficult to find out the structure under the nappe structure belt and hinder the exploration process of oil and gas resources in this area. In 2003, the experiment of “multi-line (wide line) variation of multi-line with variable line element” was conducted in Guangyuan area in the northern segment of Longmenshan structural belt and obtained quite good seismic reflection profile in “front and back mountain belt” of Longmen Mountain. Belt found a well-preserved large anticline. Starting from the eastern boundary of the foreland belt, the width of this concealed tectonism extends westward beyond 25 km up to the middle of the hind mountain belt. The discovery of a buried tectonic setting has made the recent promise of finding large-scale fields in the area a reality. According to the theory of fault-related fold, the article comprehensively explains the wide-line profile and analyzes the deformation history of the northern segment of Longmenshan structure based on the regional geological research results.