Research On Fine Evaluation Of Reservoir In Nanpu No.5 Structure Zone

The shallow oil and gas are accumulated in Nanpu 5 structure,it is the main oil production area of Nanpu Oilfield,and it has a large rolling evaluation of development potential.Nanpu 5 tectonic fault,volcanic rock development and reservoir affected by sediments.The physical properties of reservoirs in different tectonic sites are different,and the evaluation of oil and gas is difficult.Therefore,it is necessary to study the reservoir evaluation of Nanpu 5 tectonic belt.In this paper,the eastern section of the Nanpu 5(Ed1)to the Sand one(Es1)reservoir group as the research object,lithologic traps identification,characterized and evaluated as well as optimize the exploration targets,which are on the basis of the three-level stratigraphic divisions.The study area is selected to be 310 km2.The information of seismic,logging,and reservoir is comprehensively consideration.Carryying out the breakdown of the system and the fine implementation of the structure.The pre-stack time migration data of the middle and deep sandstone are used to determine the sequence interface and the maximum flood via the combination of well-shock and the synthetic fine record to realize the fine characterization of the overall structural features of Nanpu 5.Depth analysis of Nanpu 5 deposition and reservoir characteristics,including the environmental analysis of regional sedimentary,the identification of sedimentary types,the distribution and evolution analysis of sedimentary types,and the analysis of main controlling factors of reservoir characteristic and formation.Following the principle of the region to the local,the oil groups to the small layer,the rough to the fine,and step by step control principle of the interpretation,the purpose of fine structural interpretation and reservoir prediction are achieved.Using the model forward modeling technique,the geologic model of thin layer and thin interbed volcanic rocks,central and fractured crater is designed according to the characteristics of volcanic rocks of Nanpu 5,and the seismic response of different types of volcanic rocks is obtained by ray tracing principle.Establishing time slices,coherent sections and texture properties to determine the caldera method.Based on the above study,two target optimization zones were identified on the Nanpu 5 structure,and identified low-level structural traps,stratigraphic-lithologic traps and volcanic-related traps at the same time.