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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。

COMPREHENSIVE INTERPRETATION OF SEISMIC AND GEOLOGICAL DATA IN THE NORTH SECTION OF LONGMEN MOUNTAIN STRUCTURAL BELTS

Several gas fields being of a certain scale have been discovered in the basinal region near the eastern edge of Longmen Mountain nappe structural belts but there is no breakthrough in the nappe structural belts. Because the geographic conditions of Longmen Mountain thrust faulting belts are very abominable， it was very difficult to obtain any good seismic reflection data， therefore it was hard to determine the structural shape beneath the nappe structural belts， thus preventing the course of exploring for oil and gas resources in this area. A “bin variant multiline (wide line) section acquisition” test was carried out at Guangyuan region in the northern section of Longmen Mountain structural belts in 2003. The high quality seismic reflection sections passing through the front and back Longmen Mountains were achieved， thus discovering a well preserved large sized anticlinal structure in the nappe structural belts. This buried structural belt has a width of more than 25 km extending from the eastern edge of mountain front to the middle section of back mountain zone in the west. The discovery of this buried structure has made the hope of finding out large sized gas field in the near future be turned into reality. The comprehensive interpretation of wide line section was carried out according to the fault related fold theoretic pattern， and the deformation history of the northern section of Longmen Mountain structural belts was analyzed in combination with the regional geological research achievements.