The Effect On Petroleum Accumulation Of Structure-magmatism In Zhongguai Bulge Jinlong10 Wellblock

The jinlong 10 wellblock located in the zhongguai uplift in the northwestern margin of junggar basin,is a low porosity and ultra-low permeability block tectonic-lithologic reservoir controlled by "buried hill landform" and faults.Through detailed interpretation of 3D seismic data,combined with well seismic tracking and comparison,a cross-well framework profile was established to divide the carboniferous volcanic eruption cycle,implement the structure distribution on the top of each layer in the study area,and analyze the characteristics of tectono-magmatism.Study think that the study area has experienced-the late carboniferous to the early Permian stretching rift,twisted thrust pressure of late Permian,Triassic and Jurassic pressure thrust,cretaceous extrusion strike-slip four tectonic evolution stages,such as extrusion thrust,stretch back flush,hedge,trapezium,negative flower strike-slip tectonic deformation styles,stretching construction of carboniferous volcanic rock has a control function.The lithology,lithofacies and geochemical analysis of the volcanic rocks in the study area indicate that the volcanic rocks in the jinlong10 well area include four types of lithofacies: explosive,overflow facies,volcanic channel facies and intrusive facies,which were formed in the post-collision environment by theanalysis of geochemical characteristics.The U-Pb results show that the volcanic rocks were formed in 322.4±1.1Ma.Rock types and fractures are the main factors affecting reservoir physical parameters according to the four-character analysis.The paleogeomorphology formed by the early extensional structure is located in the high part of the structure,which suffers from strong weathering and denudation.Unconformity is not only the main channel of oil and gas migration,but also the key to form the buried hill trap.