摘要
玉中构造带是西昆仑造山运动和阿尔金造山运动共同作用的产物。对于玉中构造带,前者研究较多,后者常被忽略。为了明确阿尔金造山运动对玉中断裂带的作用及石油地质意义,文中通过对地震资料的精细解释,明确了玉中构造带的构造样式、形成期次、形成机制及构造演化等,探讨了玉中构造带潜在油气勘探的方向。研究发现:玉中断裂带在平面上呈弱横向“Z”字形,以挤压变形为主,兼具右行左阶压扭性质;构造样式分为东、西部两大段,西部为直立走滑段,东部为逆冲滑脱段,东部又可细分为4段,即西叠接段、中断褶段、东叠接段、东断褶段。直立走滑段断裂样式、性质、形成期次、形成机制与逆冲滑脱段存在差异。直立走滑段在晚奥陶世末—泥盆纪主要受东南方向阿尔金造山带斜向挤压应力形成,而逆冲滑脱段在中奥陶世始—晚奥陶世末主要受西昆仑造山带南北向挤压应力形成。沿走滑断裂形成的缝网发生溶蚀作用后,更易形成优质储层,在接受北东向走滑断裂输导的油气后,存在形成断溶体油气藏的可能性。
Yuzhong structural belt is the product of the joint action of West Kunlun orogeny and Altun orogeny,the former orogeny is studied more,and the latter orogeny is often ignored.In order to clarify the role of Altun orogeny on Yuzhong fault zone and its petroleum geological significance,through the fine interpretation of seismic data,this paper defines the structural style,formation stage,formation mechanism and tectonic evolution of Yuzhong structural belt,and discusses its potential oil and gas exploration direction.It is found that the Yuzhong fault zone is in weak"Z"shape on the plane,dominated by compressive deformation,and has the characteristics of dextral left-step compression and torsion.The structural style is divided into two sections:the east and west.The west section is a vertical strike slip section,the east is a thrust decollement section.The east section can be subdivided into four segments:the west superimposed segment,the middle fault fold segment,the east superimposed segment and the east fault fold segment.The fault style,nature,formation stage and formation mechanism of the vertical strike slip segment are different from those of thrust decollement segment.During the Late Ordovician to Devonian,the vertical strike slip fault segment was mainly formed by the southeast Altun oblique compression stress,and the thrust decollement segment was formed from the beginning of Middle Ordovician to the end of late Ordovician,mainly by the north-south compression of West Kunlun.After the dissolution of the fracture network formed in the vertical strike slip fault,it is easier to form high-quality reservoirs.After receiving the oil and gas transported by the NE strike slip fault,it is possible to form fault-karst reservoirs.
作者
马海陇
邓光校
王震
文欢
张长建
丁立明
李杰
MA Hailong;DENG Guangxiao;WANG Zhen;WEN Huan;ZHANG Changjian;DING Liming;LI Jie(Exploration and Development Research Institute,Northwest Oilfield Company,SINOPEC,Urumqi 830000,China)
出处
《断块油气田》
CAS
CSCD
北大核心
2022年第1期1-7,共7页
Fault-Block Oil & Gas Field
基金
中石化重大科技专项课题“深层断溶体油藏描述及开发技术研究”(P18042)。
关键词
断裂分段性
构造演化
形成机制
玉中断裂带
麦盖提斜坡
fault segmentation
tectonic evolution
formation mechanism
Yuzhong fault zone
MaiGaiti slope
