Studies On The Pathway Systems Of Typical Buried Hill In Dagang Exploration Area

Based on the theoretical methods of geology,logging and geochemistry,this paper analyzes the transport elements of the typical buried hills in the Dagang exploration area of the Huanghua Depression from the aspects of faults,reservoirs and unconformity,and divides the combination of buried hill transport elements.Types,combined with oil and gas sources,hydrocarbon accumulation period,etc.,comparative analysis of the space-time effectiveness of the buried hill transport system,established a typical buried hill transport system control model.The faults in the study area are mainly distributed in the buried hill tectonic belt in the depression,and are mostly in the form of “Y”-shaped combination,which is formed in the Yanshanian and Xishanian periods.There are various types of reservoirs,among which the Carboniferous-Permian and Mesozoic sandstones of Wangguantun and Bohai buried hills are relatively developed,and the Carboniferous-Permian sandstones and Ordovician carbonate rocks of Wumaying and Yubei buried hills are more common.Development,the North Dagang Qianshan is dominated by Ordovician carbonate rocks.The main development of the Ordovician in the study area is unconformity and is widely distributed throughout the region.According to the combination characteristics of the transport elements,the buried mountain transport system in the study area is divided into fault-sand body type and unconformity type.Through the comprehensive analysis of the space-time effectiveness of the typical buried hill transport system in the study area,it is believed that the Kongdong fault of Wangguanyu buried hill has a transporting effect on oil and gas.The difference in the stride relationship between the stratums on both sides of the fault is the difference of oil and gas distribution in the buried hill.The main controlling factors;the faults of Wumaying and Qibei buried hills mainly play a lateral blocking effect on oil and gas,and the anticline structural traps of Wumaying buried hill and the continuous fault block structure of Qibei buried hill have Conducive to the accumulation of oil and gas.According to the difference of oil and gas transmission in the transmission system,the oil and gas transmission mode of the buried hill in the study area is divided into two types:source-side lateral docking type and source rock-up type.The lateral docking type can be divided into single lateral docking.Type,stepped type and double side butt type.Through comprehensive analysis,the typical buried hills in the study area mainly contain three types of transport system control modes represented by Wang Guanyu,Wumaying and Qibei:(1)The Kong 2 Member of the Wangguantun Buried Hill is at the end of the Paleogene A large number of oil and gas are generated,and the oil and gas are laterally transported at the source and reservoir opposite to the Kongdong fault,and migrated to the middle and Paleozoic sandstone reservoirs to form agglomeration;(2)Carboniferous-Permian of Wumaying buried hill The coal-series source rocks mainly generate natural gas in the late Paleogene,and migrate to the underlying Ordovician carbonate reservoir through the unconformity of the Ordovician,and form an accumulation in the anticline structure;(3)The Carboniferous-Permian coal-series source rocks in the North Buried Hill mainly generate large amounts of natural gas at the end of the Paleogene,and are transported to fault-type structural traps through faults and fractures to form aggregates.