The Tectonic Pattern And Control Of Hydrocarbon Accumulation In Yingjisu Area

This article obtains from the fine structure interpretation,combining with the structural history,detailed analysis in this paper,the tectonic pattern in the study area.Based on the analysis of tentonic characteristics in the study area.Summarizing 3 kinds of first-order tectonic pattern and 8 kinds of second-order tectonic pattern.Early extrusion model: includs fold the blunt,blunt and hedge three tectonic style.The middle uplift denudation model: Includes erosion of buried hill,the high Angle unconformity structural style.The later Pressure torsional mode: includes slip fold,fault propagation fold and positive flower structure style.Besides,analysis the petroleum geological conditions of this area.The main oil source reservoir in this area is cambrian-ordovician mudstone.With the overlying strata communication fault has the potential of hydrocarbon accumulation.The reservoir in the study area is rich.The silurian,devonian system and Jurassic sandstone.The porosity and porosity of silurian,devonian system are medium,but Jurassic's porosity and porosity are batter.They are all the good reservoir for gas pool.The number of structural traps in the study area is rich,and the size is large.They are good for oil and gas gathering place.Cap rock condition is general.Mainly silurian system,devonian system,the two main layer section of mudstone is not development,lack of regional cap rock.This is to restrict the disadvantageous factors of hydrocarbon accumulation in the study area.Complete with detachment fold and fault propagation folds in the form of anticline traps should be the first choice for oil and gas exploration.Anticline in the case of local caprock development can form favorable structural trap,provide good oil and gas gathering place.Finally,the paper puts forward the research area of Longkou No.2 and Weima No.2 structural trap are favorable oil and gas exploration targets.