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The Research And The Application On Nonmarine High Resolution Sequence Stratigraphy And Reservoir Prediction Technology

Posted on:2009-05-24Degree:DoctorType:Dissertation
Country:ChinaCandidate:J R GaoFull Text:PDF
GTID:1100360245463448Subject:Earth Exploration and Information Technology
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The survey of paper is Jilin Oilfield Haituozi North Dabusu,which located in Changling depression western area of south center depression area in Songliao basin.It is that this area tectonic evolution belongs to the part under the control of south tectonic evolution in Songliao,on which there are four main stages,uplift erosion period,rifting period,depression period and basin atrophy period.According to the information collected,the synthetic seismogram of wells and seismic are demarcated to ensure that every geological interface and seismic event is precisely corresponding and every event near reservoir well is matched and seismic data on time-domain and logging data on depth-domain is combined correctly.By analysis of the superiority of 90°-phase in seismic interpretation, we observed that 90°-phase model is good for the interpretation seismic wave,which simplifies the interpretation rules,seismic response on wedge-shaped sand shale interbedded is a simple main trough, and it can better reflect the matching relationship between impedance and lithology.Compared to the seismic thin bed,the seismic event symmetry sand,seismic waves polarity instructs the lithology.Seismic data of 90°-phase of will greatly improve the interpretation of seismic data,and the location of sands basically is consistent with the seismic events.But the mud shale shows the opposite polarity,which undoubtedly brings lots of benefits to the seismic lithology interpretation. From another perspective,the seismic data of 90°-phase is equivalent to re-shaping seismic channel to make it close to impedance profile.Thereby,it improves the information interpretation.What the above mentioned is simple,reliable and has no damage to data.Therefore, the seismic data of this region is processed with 90°-phase.The relationship of seismic events and strata are considered on the basis of the above.The paper considers that some views that seismic events represent the same sedimentary sequence by predecessors are not adequate.Therefore,the article gives that the isochronous sequence stratigraphic framework technical supervision and provides an introduction to the strong dependence between the seismic events and the frequency of seismic data by the theoretical model and the actual seismic data.Some events vary,which is not dependent on the frequency changes.However,some events reveal the different contacts along with the changes in frequency.Meanwhile,it proves that the seismic events which do not depend on frequency reflect strata connections.Thus,it avoids the traveling time occurrence in the course of the seismic interpretation,by which more objective seismic facies can be obtained. The more high the frequency on the data of the seismic sections is, the more objective the strata reflects.The more closer to the isochronic surface strata can be acquired,bywhich control the strata slice has been done,by which and the link to wells the sedimentary facies is judged effectively.The method above mentioned firstly has been applied in Haituozi region,Songliao basin,where the wells was divided according to sequence stratigraphy and tracing interpretation to the strata interfaces and the widest flooding surface.The reliable strata informations has been acquired as the isochronous sequence stratigraphic framework technology being applied.Acoustic logging curve and logging response contained Lithologic information has some corresponding connections in the practical work. Consequently,it is true that enhancing on reservoir prediction vertical resolution by rebuilding reservoir log.Vertical resolution is the key to reservoir prediction in the lithological reservoir exploration.Currently in the term of conventional constrained inversion,it is used that acoustic logging curve usually constrains reservoir inversion.While the difference between reservoirs and surrounding rock velocity is not clear,however,the initial logging vertical solution will be low,which undoubtedly reduces the accuracy of inversion.In view of the theory,firstly the rock geophysical analysis to the wells in region;the analysis the connections among of the acoustic log,electricity log and GR log laid a foundation for reservoir reconstruction by logging data,cross contrast analysis and reservoir sensitive parameters-SP curve,then it is necessary that Log pretreatment including elimination of abnormal points environmental correction,correction depth,thickness correction,SP correction,oil and gas correction,such as lithology correction.Through the log of correspondence analysis,filtering,to eliminate the logging of abnormal points.Logging Response is logging detection equipment within the scope of the average physical response,the local thin layer, the rate of logging response will be low,its value can not reflect the real situation of formation,must log on to slice correction.When the reservoir of oil and gas,would be SP,resistivity,porosity logging impact,the impact of the elimination of oil and gas,logging response reflects the formation of the true situation.In reservoir characteristics of reconstruction,must abide by two principles:①multidiseiplinary,for the study area reservoir, geological features,in-depth analysis on the basis of geology, physics as a guide to rock,make full use of lithology,Electricity, radioactive and other logging information and acoustic nature of the relationship between the reservoir characteristics of reconstruction, and make this curve has obvious reservoir characteristics,make it easier to identify;②guarantee match between the Synthesis of log of Reconstruction and seismic trace,so that it can guarantee that after the inversion of the data in the vertical has a high resolution, improve reservoir prediction accuracy.It applies not only the real high frequencyimpedanee data but also the low-middle frequency SP data.Afterwards,the applying strata and building impedance module under the constraint of well by reservoir character are the reasonable integration,which is the aim to increase the vertical solution of inversion.Relative impedance will be obtained and the second inversion will begin.The relative impedance and the logging high-frequency elements named is the high-frequency compensation technology.This method increases the vertical solution of inversion sharply in the basis of the original of inversion and the inversion itself acquires the absolutely impedance from relative one,which realizes the real compensation of logging high-frequency data,helping the identification of thin reservoir,consequently,accurate predicting the sandshale distribution,especially the single sand.Abstracting sandstone by interlayer impedance value,describing the sand distribution character of sequences and single sand,analyzing space-time regularity of sands from the view of sedimentary,comparing with the stratigraphic section,all above mentioned verify the reasonableness of the equal time slice.
Keywords/Search Tags:sequence stratigraphic framework, strata slice, seismic inversion, reservoirs predict, log reconstruction
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