Distribution And Its Main Controlling Factors Of Reservoirs Of Shahejie Formation In Qingdong Sag,Jiyang Depression

In recent years,the reservoir or good oil and gas shows of Shahejie formation have been discovered in Paleogene System of Qingdong Sag,Jiyang Depression.In the field of petroleum geology study,especially tentonic characteristics,depositional system and the study of hydrocarbon source,many important points have been achieved.However,because of complex reservoir forming condition,there are still some problems to be resolved in hydrocarbon distribution pattern and main controlling factors.Therefore,to solve the problem of hydrocarbon exploration,this research analysed the hydrocarbon distribution characteristics on longitudinal and landscape,and discussed the different geological factors,such as reservoir property,microfacies,hydrocarbon source distribution and fault tectonic distribution and evolution,to the control of hydrocarbon occurrence,and optimized the favorable area for hydrocarbon distribution.The result shows that the lower section of the 3rd member and the upper section of the 4th member in Shahejie Formation are the main oil layers.On the basis of hydrocarbon distribution,the study area can be divided into four hydrocarbon accumulation zones.Different geological factors have different control actions to the hydrocarbon distribution of study area,and the same geological factor also have different influences in hydrocarbon distribution in different regions of the study area.In view of the lack of the study of reservoir property,the research discussed the control functions of reservoir physical property to the hydrocarbon distribution in the study area,from different oil layers to different hydrocarbon accumulation zones,from distributional characteristics to lower limit judgement,clarified the control actions of reservoir property to the different degree of hydrocarbon distribution.The research shows that Well Qingdong5,Well Qiongdong12,Well Qingdong23 and Well Qingdong30 in the lower section of the 3rd member in Shahejie Formation and Well Qingdong1,Well Qingdong5,Well Qingdong12,Well Qingdong23,Qingdong25 and Qingdong30 in the upper section of the 4th member in Shahejie Formation are the favorable areas for further more exploration.