Application Of Seismic Reservoir Prediction Techniques In Member E₂s₃² Of Block C,Liaohe Basin

This paper takes the Block C of Liaohe basin as the research area,Shahejie formation third member second sub member in Paleogene system as a research target,and aims at using the seismic reservoir prediction techniques such as seismic attribute analysis and seismic inversion combined with geological model to aggregate analysis the transverse characteristics of the target zone and predict the favorable zone.Firstly,the study realize the seismic reflection horizon calibration and horizon tracking by meticulous mini-strata correlation,then making seismic synthetic records.Secondly,we finished the interpretation of the top and bottom of member E₂s₃² and six other small layer in Block C of Liaohe basin(area 43.75km²).According to the requirements of industrialization cartography maps compiled the corresponding results.At last,it is confirmed that the research area are two north-east,south-west axial large reverse,nearly parallel faults clamping with high barrier,and clearly describe the“second steps”between the two faults at the same time.The post-stack 3D seismic data of the study area is pre-processing.The coherence cube is produced by detecting the discontinuity of the seismic volume.Judging fault trends and enhancing the propensity coherence properties according to the regional characteristics.Finally,based on the cluster analysis,the faults are extracted and integrated,and the 3D fault structure model is established.The fault zone is divided into four levels according to the scale,and realizes the recognition of lower-order faults especially the kind of fourth fault which fault distance less than one seismic axis.Also the control of the fault to the well group is verified,and makes it clear that the structural characteristics of the study area are the main controlling factors of the reservoir.Based on the regional sedimentary background,combined with the well logging curves,the sedimentary facies division of the 76 drilling wells in the study area was completed.It is confirmed that the target zone development in the study area is mainly dominated by the fan delta front,including the micro facies type like the underwater channels,underwater diversion channels,the front sheet sand and river mouth bar,and the sedimentary phase diagram is drawn in the 6 small layers of the well area.By using both amplitude class seismic attribute and logging lithology interpretation results,the analysis of sedimentary microfacies characteristics in a well area and depicting sandstones boundary carefully,we find that the study area is not short source deposition and sandstones develop characteristics largely like people used to know but the characteristics of inherited delta deposits,which underwater diversion channels with a strip distribution characteristic can be identified clearly.The reservoir distribution in the study area was predicted by structural interpretation,sedimentary microfacies and seismic attribute analysis.By means of geological model constrained seismic inversion techniques,the transverse distribution and development characteristics of the reservoir are studied,and the thickness map of sandstones in the 6 small layers of the study area is drawn.Statistical analysis and verify production performance data,combined with structural interpretation,seismic attribute and prediction of seismic inversion,then provide two reservoir favorable zones,and one suggested well.