Reverse Structural Characteristics And Developmental Evolution Of The Helong-lanjia Reverse Tectonic Belt

Helong-Lanjia reverse tectonic belt in the southeast uplift of Songliao Basin takes up the two-fifths of the structure in dehui depression.The field data verifies that the region has the advantage of hydrocarbon generation?migration and accumulateion.Combined with the production dynamic data?logging data analysis and seismic interpretation data and so on.we can know that the tectonic characteristics and development of the region determine transportation channels ? the storage conditions and spatial-temporal distribution of oil and gas,and the structural study of the reverse tectonic belt in the area is of novel significance in the field of geology and oil and gas.The structural interpretation of the study area is based on 3D seismic data.According to logging geology and gas geochemistry theory,the area is firstly stratified by logging data.Next,the stratigraphic pattern of the region is established.The Seismic sedimentology?seismic stratigraphy are applied to the well-seismic data for rectifying the horizons.Finally,a detailed explanation is carried out in combination with geological theories such as structural geology petroleum geology,and even the accuracy is 1×1.It is clear to realize stratigraphic distribution and wave resistance characteristics about Huoshiling formation?Shahezi formation?Yingcheng formation?Denglouku?The 1st section of Quantou formation,and reverse structural characteristics of their top and bottom surface?reverse conformational sequence and its style?and reverse tectonic evolution.On the basis of the above results,the trap characteristics and gas reservoir characteristics of the structural gas reservoir are studied.There are five unconformity interfaces in the research area,which refers to five tectonic cycles in the target layer,is divided into 3 kinds of fracture and forms three tectonic units.According to the geological tectonic characteristics and evolution regularity,the area can be divided into three ? structural sequences,the development has a variety of structural types and tectonic style.Vertically,the tectonic activity generally decreases,while the inversion intensity generally increases;parallelly,the tectonic belt of the sedimentary period was the most active,and the lanjia structural belt was the weakest,which are opposite to the reversal period.To be found that the main development of traps are the deeply tensile elongation and the shallowly compression inversion structure trap in the process of reverse tectonic evolution,which mainly exist in the strong faulting of the Graben-Reverse of Helonglanjia tectonic belt.Under the influence of deep fracture,"deep hydrocarbon-longitudinal fracture transmission-structural favorable site accumulation" is formed.