Structural Deformation And Hydrocarbon Accumulation In Kongxi Structural Belt,Huanghua Depression

Kongxi structural belt is one of the hydrocarbon-rich belts in the Huanghua Depression,with a relatively high degree of exploration,but its structural deformation characteristics,structural evolution characteristics,and reservoir controlling mechanisms are lacking in systematic and exhaustive research.The thesis is based on the theory of structural geology,based on the latest seismic,drilling and other geological data,through structural analysis,balanced profile,comprehensive analysis of oil and gas generation systems,and other methods of structural deformation characteristics,oil and gas systems,and reservoir formation and control of the area.The research has been carried out and the following findings are obtained: 1.The Kongxi structural belt is mainly developed with extensional structures,but a large number of contractile structural styles developed in the Paleozoic and Mesozoic,mainly developing "y" and anti-"y" shapes,The combination extension structure pattern of horst and graben and thrust imbricate fan contraction structure style.2.The structural evolution of Kongxi structural belt is divided into the stable platform period during the Carboniferous and Permian,the compression depression period during the Mesozoic deposition,and the reversal period during the deposition of Shahejie Formation and Guantao Formation.3.The study area developed two sets of Paleozoic and Cenozoic petroliferous systems.The control effect of structure on hydrocarbon accumulation is mainly reflected in: structural activity creates various types of traps;it can form lower-generation and upper-reservoir,and side-generation and lateral reservoirs.With the matching relationship between source and reservoir,the Kongxi fault system constitutes the main channel for controlling oil and gas migration,and the weakening of its later activity is also conducive to oil and gas preservation.4.The Kongxi area has the oil-bearing characteristics of the entire graben and fault block.The later favorable exploration areas are concentrated in the the Meso-Neoproterozoic of the Kongdian anticline,and the Wangguantun buried hill.