Reserves Calculation Of Lithologic Reservoir In The First Member Of Tenger Formation Of Aer 3 Block,Aer Sag

Aer sag is located in the northern part of Bayinbaolige uplift,The regional tectionic setting is basically consistent with Erlian basia,and the overall structure is characterized by an open structure and trend near the North East.From west to east,they are roughly divided into four tectonic belts: the western slope belt,the central trough belt,the central anticline belt and the eastern steep belt.The study about tectonic evolution history and sedimentary environment,the sentral trough belt is the main oil generating area,and the central anticline belt is the most abundant oil and gas belt.The study about sedimentary evolution characteristics,the thired member of Aer is a good source rocks,the first member of Tenger and the fourth member of Aer are the main oil-bearing series,the sedimentary of the first member of Tenger is dominated by fan delta.The fan-delta sand bodies deposited in the first member of Tenger formation are characterized by multi-source,rapid facies variation,coarse lithology and multiphase superimposition,which make it beneficial to form lithologic reservoir.Through the analysis of the main controlling factors of hydrocarbon accumulation in Aer3 block,it is clear that the favorable facies belts and sandstond physical properties play a major controlling role in oil and gas accumulation.types in Aer sag are mainly lithologic reservoir.Structural-lithologic reservoirv is the secondary types.As the reserves of Aer 3 reservoir were reported,it is clear that the difficulties of reserves calculation for lithologic reservoir are mainly embodied in the identification of oil-bearing area boundary.With the development of petroleum prospecting techniques,reservoir prediction technique and method have made a great progress and improved constantly.In recent years,the oil-bearing area boundary of lithologic reservoir has been determined widely in reserves calculation by using reservoir prediction technique,which won extensive recognition from experts in reserves assessment.In this paper,the features of sand body distribution for fan-delta sedimentary facies in plane and space are figured out by deeply analyzing Aer lithologic reservoir in Erlian Basin.Reservoir prediction methods which apply to the features are optimized.Reservoir prediction has been in progress from qualitative and quantitative aspects.By contrast to drilling results,the correspondence between reservoir thickness and sand body thickness calculated by prediction technique is built for permeable sandstone.In addition,determination method of oil-bearing area boundary for fan-delta lithologic reservoir are pointed out.The research achievements provide basis for reserves calculation of lithologic reservoir and offer technical support to handing in lithologic reservoir reserves of Erlian Basin.