Reservoir Description Of The Main Block Of M Oilfield

M oilfield is a typical Supra salt structure,and the strong and frequent tectonic activity makes the structure and fracture system complex,and the small faults are extremely developed.At the same time,the formation of angular unconformity is due to the erosion of the strata after the uplift.The main block of M oilfield reservoir description research focus.Through fine stratigraphic and stratigraphic correlation,structural comprehensive interpretation,reservoir comprehensive evaluation,reservoir characterization and estimation of reserve,the paper points out the control role of small faults on oil and gas accumulation,the distribution law of sand body and the distribution law of main oil layer,and sets up the reservoir geological model of the main block of M oilfield(structural model,sedimentary facies model and property model).Research shows that:1)the main oil-bearing series for K1v and T sandstone,and the main block is divided into south and north two groups,divided into 3 blocks and 5 oil-bearing block respectively;2)stratum contact relation is complex,and there are four types of typical unconformity;3)T sandstone is mainly delta front deposit,because of the uplift and erosion of the end strata,the sand bodies are not fully developed,and the Klv sandstone is a small coastal sand bar near the foreshore,and the sand bodies are elongated along the coast direction;4)T sandstone reservoir is of high porosity and medium-low permeability,while Klv sandstone reservoir is of high porosity and low permeability;5)the amplitude attribute is strong,and has good correlation with sandstone thickness and porosity,which is directly used for reservoir prediction,and has higher coincidence degree;6)The main block reservoir types are divided into three types,the south block is fault reservoir and fault lithologic reservoir,and the North block is fault and unconformity block controlled reservoir.