【摘要】 龙门山与四川盆地结合部位横跨川西坳陷和龙门山两大构造单元,包括龙门山前山带和龙门山前缘,二者以灌县—江油(关口)断裂为界。由于龙门山自北西向南东的多期逆冲推覆,使得盆山结合部位断裂发育,且地层隆升遭受剥蚀,因此,油气保存条件对该区油气探勘至关重要。文中主要利用盖层、压力和沥青分布特征,并结合龙门山天然地震分布,对盆山结合部位的油气保存条件进行了分析。结果表明,灌县—江油断裂上盘区域隆升剥蚀作用强烈,大面积出露下古生界地层,油气保存条件遭到破坏;其下盘深部海相层系则存在膏泥岩的保护,是将来深部勘探有利区;龙门山前缘地层发育完全,油气保存条件好。更多还原

【Abstract】 The coupling area between Longmen Mountain and Sichuan Basin across western Sichuan Depression and Longmen Mountain mainly includes the front range and the front of Longmen Mountain,and the two parts are separated by the Guanxian-Jiangyou (Guankou) fault.Due to multiple phase of thrust nappe,there developed a large number of faults in the coupling area,and the strata suffered from erosion.Therefore,the petroleum preservation conditions are crucial for the petroleum exploration in this area.Based on the distribution of caprocks,fluid pressure and surface bitumen,combined with earthquake epicenters distribution,the petroleum preservation conditions in the coupling area are analyzed.And it is concluded that: it suffered from uplift-erosion in the hanging wall of GuanxianJiangyou fault,and large area of the Late Paleozoic strata outcropped,so the petroleum preservation condition here is destroyed;there exists gypsum mudstone in the footwall of Guanxian-Jiangyou fault,so the petroleum preservation condition of deep marine layers is well,therefore,it is favorable exploration area;the strata developed completely in the front of Longmen Mountain,so the petroleum preservation conditions is well.更多还原