Fine Seismic Interpretation And Reservoir Prediction Of Xinganling Formation In Suderte Area

Suderte area is located between Beixi and Beizhong oil-generating sag,which is inherited "sag uplift" structure controlled by fracture developed on the base of paleo uplift in Budate Formation.This area has great exploration potential.The existing knowledge for reservoir forming can not meet and guide the exploration work.It is necessary to make full use of the existing data and the latest data to carry out the study of fine reservoir research.The exploration target stratum is Jurassic Xinganling formation in the study area,which formed in the fault subsidence stage.In this paper,according to the sequence stratigraphy,combining with drilling,logging and seismic data,the fine stratigraphic classification and correlation are carried out,and Stratigraphic framework is established.On the base of logging-seismic combination idea,takeing synthetic seismogram as the bridge,the fine horizon and fault interpretation of X0,XI,XII,XIII,XIV and BI six top reflection interface is compeleted by using coherence,3D visualization technique etc al in the Suderte area.Through the establishment of the high precision space variable velocity field,tectonic map Structural characteristics analysis are carried out in the Suderte area.Through the sensitivity analysis of curve,the logging curves which are sensitive to reservoir sensitivity are selected.Because the feature of different frequency scale of logging curve can reflect different sedimentary characteristics,fitting wave impedance reconstruction seismic inversion is carried out in the Suderte area.The prediction of XI and XII formation is completed and the sandstone thickness of 26 layers is predicted.The sand prediction thickness coincidence rate of reserved well is 76.7%.The effect of reservoir prediction is good.On the base of core and logging data,combining with the results of seismic inversion and sedimentary background of the study area,the sedimentary facies type is determined and logging facies Pattern is established in the region.Through single well facies and multiple well facies analysis,the sedimentary facies research is carried out in XI and XII and the sedimentary microfacies study of the 26 layers is compeleted.From the evaluation of source rock,reservoir characteristics,oil and gas migration and oil-water distribution characteristics,reservoir forming conditions are researched in the study area.The reservoir type and main controlling factor are summed up,and reservior forming patterns are identified in Xinganling formation of research area.Based on the research result of structure,inversion,sedimentation and hydrocarbon accumulation,according to the characteristics of reservoir development and hydrocarbon accumulation law,the favorable zone is selected.On above bases,the target positioning work is completed.Through the fine seismic interpretation and reservoir prediction research in the Suderte area,the conclusions are as follows: Xinganling formation shows the tectonic pattern of North-South zonation and east-west block in the Suderte area.Fault is dense and structure is complex.The main faults have obvious control effects on the oil and gas migration.The reservoir is the most developed in the central uplift area.The sandstone has the characteristics of large thickness,multiple layers and large variety in different layers.The sedimentary process of Xinganling Formation overall present transgression characteristics in the Suderte area.The lake go forward and backward frequently in the interior of formation,and the provenance mainly from the northern,Eastern and southern uplift zone.The sedimentary microfacies types include underwater distributary channel,interchannel,estuary bar,sheet sand,front sheet sand,turbidite and lake facies.The main controlling factors for oil and gas accumulation include reservoir conditions,oil source fault and the matching relation of oil source fault,local structure and sand body.The reservoir forming pattern includes oil and gas along sandbody and oil source fault short distance accumulation,lateral migration to the high position of oil source fault along surface of unconformity remote distance accumulation and multi-source hydrocarbon migration along unconformity surface,sand body and oil source fault accumulation.