| Strike slip structures is widely developed and slippery in Jiyang Depression,which plays an important role in hydrocarbon accumulation.Exploration practice has shown that small-scale intra-basin fracture is often a limiting factor for the formation of traps,oil and gas migration,accumulation,and destruction of oil and gas reservoirs,which the spatial distribution of oil and gas is controlled to a large extent.Studing the control effect of low sequence slip fault in oil-bearing structure on accumulation is very important for Oil and gas exploration.In this paper,based on the 3D seismic data,combined with drilling measurement data,this paper analyzes the dynamic and static characteristics of key strike-slip faults,clarifies their evolutionary laws,summarizes the controlling effects of strike-slip faults on sediments,traps,and reservoirs,and provides tectonic Geological theory support for oil and gas exploration in other similar areas.Slip faults can be divided into two types: typical slip faults and hidden slip faults.The typical strike-slip fault is divided into two types: rigid strike-slip fault and plastic strike-slip fault according to its formation period.Rigid faults are formed during the Yanshan period,and they break to the base.The plane is arranged in parallel in the North West or North East.Most of the plastic faults were active in the Miocene.There were four types of S-type,wild geese,dragonfly,and collinear types on the plane.There were broken structures,semi-flower-like structures,tree-shaped flowers,and Scroll type flower structure on the profile.There are wild geese and dendritic distribution patterns on the hidden slip fault plane;The faults developed in the sedimentary basement are larger in scale,and the fault sections developed in the sedimentary cover are upright,unbroken,and undeveloped.The strike-slip fault in the eastern part of the Jiyang Depression has the properties of skid and stretch.The relationship between skid and stretch strength of a certain part of the skid fault in a geological period was quantitatively characterized by the pull coefficient for the first time.The results show that the skid fault in qingdong sag begins in the zongdian group and has strong activity in Es4 and Es3.Among them,the tensile strength of the near-east-west fault is greater than the skid strength,and the north to North to West fault is skid.The strength is greater than the tensile strength.Rigid strike-slip fault communication deep oil source;It is easy to form structural traps such as burst structures and positive traction structures;Controlling the orderly migration of hydrocarbon source rocks and sedimentary centers.Plastic strike-slip fault is the main channel of shallow oil and gas migration.Easy to form a broken nose,broken block and other traps;The lateral change of the sedimentary system is controlled,and the phenomenon of "step-type superposition deposition" appears on the profile.The three modes of oil and gas accumulation in jiyang depression are summarized: three-dimensional transport fusion mode,Laminar transport fusion mode and cover transport fusion mode. |
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