龙门山前双鱼石南地区三维构造建模与恢复研究  

Study on 3D Structural Modeling and Restoration in Shuangyushinan Area in Front of Longmen Mountain

作　　者：李晓彤 陈伟[1] 余养里 Li Xiao-tong;Chen Wei;Yu Yang-li

机构地区：[1]西南石油大学地球科学与技术学院,四川成都610500

出　　处：《化工设计通讯》2021年第11期170-171,192,共3页Chemical Engineering Design Communications

摘　　要：川西北地区是四川盆地关键的油气勘探区,长期以来双鱼石构造区在油气勘探领域取得了显著性成果。但受龙门山及米仓山挤压构造影响,川西北部整体处于山前复杂构造区,存在多期构造叠加,邻近山前复杂构造带的地下构造变形及地震反射波场复杂,地震资料成像差,导致对复杂构造带的构造模式认识不清,严重限制了该地区的油气勘探进程。基于文献资料分析、三维地震资料精细解释和三维构造建模与恢复研究,结合区域构造背景和构造特征,研究探讨双鱼石南地区整体构造特征,基于三维构造建模结果发现:从北西至南东,整个双鱼石区域P_(1)l底~P_(1)m底、P_(1)m底~P_(2)l底厚度逐渐减薄,表明在茅口组沉积初期和龙潭组沉积初期,P_(1)l底、P_(1)m底古形态呈现北西深、南东浅的古形态特征。基于去断层去褶皱操作的古形态恢复研究结果来看,双鱼石地区P_(1)l古形态呈北西低、南东隆升的构造格局。龙潭组沉积初期,古地貌整体仍然呈南隆北坳的构造格局,但南部抬升幅度受到大幅度限制,隆深高点转至双鱼石区域的中部。Northwest Sichuan is a key oil and gas exploration area in Sichuan Basin.Shuangyushi structural area has made remarkable achievements in oil and gas exploration for a long time.However,due to the influence of Longmen Mountain and Micang mountain compression structures,Northwest Sichuan is located in the Piedmont complex structural area as a whole,with multi-stage structural superposition,complex underground structural deformation and seismic reflection wave field adjacent to the Piedmont complex structural belt,and poor seismic data imaging,resulting in unclear understanding of the structural model of the complex structural belt,which seriously limits the process of oil and gas exploration in this area.Based on literature analysis,fine interpretation of 3D seismic data and 3D structural modeling and restoration research,combined with regional structural background and structural characteristics,this paper studies and discusses the overall structural characteristics of shuangyushi south area.Based on the results of 3D structural modeling,it is found that the thickness of P_(1)l bottom~p1m bottom and p1m bottom~p2l bottom in the whole shuangyushi area gradually decreases from northwest to Southeast,It shows that in the early stage of Maokou Formation and Longtan Formation,the paleomorphology of P_(1)l bottom and p1m bottom shows the characteristics of deep northwest and shallow southeast.Based on the research results of paleomorphological restoration of fault and fold removal operation,the paleomorphological pattern of P_(1)l in shuangyushi area is low in Northwest and uplifted in Southeast.In the early stage of Longtan Formation sedimentation,the overall paleogeomorphology still showed the structural pattern of South uplift and north depression,but the uplift amplitude in the South was greatly limited,and the uplift high point turned to the middle of shuangyushi area.

关 键 词：双鱼石 构造建模 构造恢复 地震数据解释 

分 类 号：P618.13[天文地球—矿床学]