3D Structural Modeling And Evolution Analysis Of MXN Sag Segment Of Tanlu Fault Zone Based On 3Dmove

The Tancheng-Lujiang fault zone runs through the eastern part of our country,starting from Heilongjiang province in the north,to Anhui province in the south and continues to extend to the south,as long as more than two thousand kilometers in our country.The MXN sag segment of Tanlu Fault zone belongs to the Bohai section of Tanlu fault zone,which is also known as Yingwei segment.The MXN sag segment of Tanlu Fault zone belongs to the Bohai section of Tanlu fault zone,which is also known as Yingwei segment.MXN sag has a certain oil and gas exploration potential,but the structural characteristics and evolution process of the MXN sag segment of the Tanlu fault zone are complex,and there is still insufficient understanding of its tectonic evolution law and genetic mechanism,which has an adverse effect on the oil and gas exploration and development in the study area.Based on geological,seismic,well logging and core data,combined with previous research results,this paper analyzes the geometric characteristics of the MXN sag segment of the Tanlu fault zone,and uses the balanced profile technology and the three-position structural modeling technology to analyze the structural evolution.The structural evolution process and genetic mechanism of the MXN sag segment of the Tanlu fault zone are systematically analyzed and the analysis results are verified,which will provide some help for the oil and gas exploration in the next step.The research results show that:(1)The strike of two main faults in the study area is NNE-trending,and the small-scale faults derived from the three main faults are mostly NE,NEE and nearly EW trending.The common plane structural styles are oblique,en echelon and plume,while the common section structural styles are "Y" structure,flower structure,step structure and reverse structure.(2)The Tanlu fault zone in the MXN depression segment has undergone three changes in nature under the influence of plate movement during the Cenozoic period: the Paleocene-Early Eocene sinistral strike-slip movement period,the Middle Eocene-Neogene sinistral strike-slip movement period and the Neogene-present sinistral strike-slip compression movement period.(3)The tectonic evolution mechanism of the Tanlu fault zone in MXN sag during the Cenozoic is as follows: the NNW subduction of the Pacific plate led to the tension-sinistral strikeslip movement during the Paleocene.Due to the subduction of the Pacific plate to the NWW and the uplift of Jiaoliao uplift during the Eocene period,the fault zone experienced right-lateral strikeslip movement and compression contraction.Due to the thermal subsidence environment and the expansion of the Sea of Japan since the Neogene,the fault zone has a compression-dextral strikeslip movement.