摘要
建立龙门山北段山前复杂构造地质模型,探讨油气勘探新领域。通过对龙门山北段地质剖面及钻井资料分析、地震剖面构造精细解释以及构造演化史恢复,结果表明龙门山北段构造具有分带分层性,横向上可划分为马角坝断裂以西的外来系统(唐王寨-仰天窝滑覆体)、马角坝断裂至侏罗系-三叠系不整合的准原地系统(山前复杂断褶带)以及侏罗系-三叠系不整合以东的原地系统(四川盆地)。纵向上,山前复杂断褶带中的双鱼石隐伏断裂将山前复杂断褶带分割为复杂冲断带(上盘)、复杂断层转折褶皱带(下盘)两个构造变形层。形成龙门山的构造环境为重力滑覆导致的前缘挤压,这是由于松潘-甘孜高原在印支期由海向陆的演变(构造抬升)过程中的差异隆升,导致斜坡带上的泥盆纪、石炭纪、二叠纪及早中三叠世海相沉积层多期滑脱,形成地层时代新的断片在下、相对老的断片在上的倒序叠置。山前复杂断褶带中双鱼石隐伏断裂下盘复杂断层转折褶皱带发育的断裂均为地腹深部下三叠统之下的隐伏断裂,保存条件较好,为有利的油气聚集区。
Through the analysis of geological section,drilling data,fine interpretation of seismic profile structure and the reconstruction of tectonic evolution history,the geological model of piedmont complex structure in the northern Longmenshan area is established so as to explore new fields of oil and gas exploration.The results show that the structures of the northern section of the Longmenshan are characterized by horizontal zoning and vertical layering.Laterally,it can be divided into the allochthonous system(Tangwangzhai-Yangtianwo slip nappe)to the west of Majiaoba fault,the quasi-autochthonous system from Majiaoba fault to Jurassic-Triassic unconformity boundary(piedmont complex fault-fold belt)and the autochthonous system(Sichuan Basin)to the east of Jurassic-Triassic unconformity boundary.Vertically,the Shuangyushi concealed fault in the piedmont complex fault-fold belt divides the piedmont complex fault-fold belt into two structural deformation layers:the complex thrust belt(hanging wall)and the complex fault-turning fold belt(footwall).The frontal compression of the Longmenshan structural belt is formed by the gravity slip of the Songpan-Garze plateau to the west of the Longmenshan during the Indosinian tectonic uplift,which resulted in the multi-stage slipping in the Devonian,Carboniferous,Permian and early-middle Triassic marine sedimentary layers on the slope,and caused the reverse stacking sequence of new strata under the fault plane while the older strata above the fault plane.The faults developed in the Shuangyushi concealed fault footwall of the complex fault-turning fold belt are all concealed faults under the Lower Triassic formation at the depth,which create a good preservation conditions and are likely to be a favorable oil-gas accumulation area.
作者
杨雨
李忠权
文龙
龙伟
张本健
陈骁
刘冉
韩倩
胡懿灵
YANG Yu;LI Zhongquan;WEN Long;LONG Wei;ZHANG Benjian;CHEN Xiao;LIU Ran;HAN Qian;HU Yiling(PetroChina Southwest Oil&Gas Field Company,Chengdu 610051,China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu 610059,China;Key Laboratory of Tectonic Controls on Mineralization and Hydrocarbon Accumulation of Ministry of Land and Resource,Chengdu University of Technology,Chengdu 610059,China;Research Institute of Exploration and Development,PetroChina Southwest Oil&Gas Field Company,Chengdu 610051,China;SINOPEC Petroleum Exploration&Production Research Institute,Wuxi Research Institute of Petroleum Geology,Wuxi 214162,China;Postdoctoral Research Station of Geology,Chengdu University of Technology,Chengdu 610059,China)
出处
《成都理工大学学报（自然科学版）》
CAS
CSCD
北大核心
2022年第4期414-423,共10页
Journal of Chengdu University of Technology: Science & Technology Edition
基金
国家科技重大专项(2017ZX05008001-006)
国家自然科学基金项目(41672196)。
关键词
龙门山
山前复杂断褶带
重力滑覆
差异隆升
Longmenshan
piedmont complex fault-fold belt
gravity gliding
differential uplift
