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Research On Reservoirprediction Of Putaohua Layer In Block Ying86

Posted on:2007-10-20Degree:MasterType:Thesis
Country:ChinaCandidate:H Y DanFull Text:PDF
GTID:2120360185954528Subject:Earth Exploration and Information Technology
Abstract/Summary:PDF Full Text Request
The paper is based on the sequence stratigraphy and uses standard layer,cyclicity, well logging facies, seismic-well logging combination to analyse andcalibrate the wild cat wells. Based on the small layers calibration, with the use ofindividual well facies, section facies, well logging facies and seismic facies todefine the sedimentary facies distribution of Putaohua layer. Through the seismicproperties extraction and analysis of the Putaohua layer, and the 3D seismicinversion technique to describe the 3D spatial patterns and reservoir prediction.Throuth the application of drilling, well testing, well logging and seismic datainformation, the research and results are as follows:1. formation correlationThrough the application of standard layer, cyclicity, well logging facies,seismic-well logging combination to analyse and calibrate the wild cat wells.Through the browse of the seismic section properties and synthetic seismogram, wecan find that there are two high reflection wave groups that are easy to tracetransversely and located in the upside of the section, which are considered to beNen2, Yaojia layer and overlaid layers and are the standard wave groups.According to the lithology combination and sedimentary cyclicity to definethe reservoir layers. Putaohua layer can be divided to PI1, PI2 and PI3 three layers.2. layer calibrationAccording to the synthetic seismogram to define the seismic responsecharacter of the target layers and to set up the relationship between the boreholeand seismic data. With the help of seismic forward modeling to calibrate thereservoir, define the seismic reflection characteristics of the reservoir and toprovide the basis for the reservoir prediction.3.extraction and analysis of the seismic properties.A lot of seismic properties, such as amplitude, frequency and phase have beenextracted and analysed according to the target layers. Some seismic propertieswhich are sensitive to the reservoir reflection are selected to study the coherenceanalysis with the wells and to study the transverse reservoir distributioncharacteristics qualitatively. Through the analysis and studying the trace of drillingand inversion information. We have found that the sandstone distribution variestransversely and many layers overlaies vertically in the Putaohua layer.3.Study on seismic inversion methodsResearch on the inversion methods and parameters.4.Define the sedimentary faciesThrough the combination of individual well facies, well logging facies andseismic facies, we have analysed the sedimentary characteristics and evolutionarymechanisms to define the micro sedimentary facies of this area. Combined withStratimagic sedimentary facies software to analyse the multi-properties andreservoir prediction. The high similarity of the seismic facies of each reservoirlayers and sand isopachous map has been found, which can reflect the reservoirsedimentary micro-facies character. Study shows that Putaohua layer belongs to thelow water, delta frontal sediment and is located in the cross of the north source andwest source. The sandstone type of Putaohua layer belongs to underwaterdistributary channel and frontal sheet sand.5. reservoir distribution predictionUnder the guide of the areal sedimentary facies, with the combination of theseismic properties analysis, seismic inversion technique and 3D visualizationpredict the transverse distribution characteristics of the sandstone. Visualizationtechnique can describe the reservoir distribution. Through the regression of the welllogging parameters and the seismic parameters to predict the reservoir distribution,the sandstone within the Putaohua layer varies greatly transversely and many layersoverlaies vertically.PI1 sandstone group:During the PI1 sedimentary period, sedimentaryenvironment was oxidation and deoxidization, which refected the change of thechannel which changed from shallow to deep. There are 3 major channels whosestrikes are northeast – southwest, which are located in Ying661-Ying68, south ofYing64-Ying351-Ying80, north of Ying901 to northwest of Ying901, Sandstonethickness varies between 5m to 18m. The sandstone thickness is thick along thechannels. The thickest place is the block Ying351 and the sandstone thickness is20m.PI2 sandstone group: During the PI2 sedimentary peroid, the water body wasdeeper than PI1. The sedimentary environment is underwater distributary channeland sheet sand. There are 4 major channels. The channels direction is northeast tosouthwest. Sandstone thickness varies between 0m to 23m. There is sandstonepinch out in the study area.PI3 sandstone group: During the PI3 sedimentary peroid, the water body wasthe deepest. There are pinch outs in Da428 and Da414 in the south of the area,Ying83 and Ying80 in the center of the area. Sandstone thickness varies between5m to 22m. Sandstone sedimentary environment is underwater distributary channeland delta frontal sediment . The thickest region is in the northwest of the study areaaccording to the prediction, whose thickness is about 27m.6.Comprehensive reservoir evaluationBased on the comprehensive study and the distribution characteristics of thestructure, sediment, reservoir, oil and water, the reservoir has been evaluatedcomprehensively.The following conclusions can be drawn as followings: The distal bar andsheet sedimentary lens sand, which are in the southeast of the Putaohua layer,belong to the lithologic deposit. Underwater distributary channel sandstone islocated in the Yingtai nose structure, Which can not form a reservoir because thereare no barriers upward. According to the research, hydrocarbon accumulation iscontrolled by the faults and reservoir. Faults act as paths for the hydrocarbonmigration. Many stratigraphic traps must connected with the hydrocarbonmigrating path during the hydrocarbon migrating period. Only the hydrocarbonsource can be accumulated to form the lithology reservoir. Through the study, wehave ascertained the sedimentary sequence changing mechanism of the Putaohualayer, reservoir patterns, reservoir distribution characteristics and the favorablereservoir distribution to predict the favorable oil-bearing reservoirs and explorationprospect.
Keywords/Search Tags:Reservoirprediction
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