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The Prediction Of Fractured Gas Reservoirs Of Tight Clastic Rock

Posted on:2006-11-20Degree:DoctorType:Dissertation
Country:ChinaCandidate:C R WuFull Text:PDF
GTID:1100360155458551Subject:Earth Exploration and Information Technology
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The predication of fractured reservoir is a research that full of challenge, but we must face to it because of its importance in oil and gas industry. The former have work hard at it for years and gain plentiful fruit, but there are still many difficult. So we take the 2nd mbr of Xujiahe Formation of Xinchang Gas Field as a case, to predict fractured gas reservoir, using bore well, logging, seismic data, analyzing sedimentary facies, sequence, earth stress, seismic attribute, and the relationship between their and fracture.The main content and result in this dissertation include the following parts: The first is divided the sedimentary facies in 2nd mbr of Xujiahe Formation and there two types of facies .that are braded stream dalta and lake. For the first time divided the high resolution sequence, there are one long time cycle, four middle time cycles and many short time cycles in 2nd mbr of Xujiahe Formation. Creatively use rock solid attributes to predict the plane distribution of facies and the result is accurate. This method is important to where there few bore well and can not divided facies using classic method.The second is detect and analyse fracture using routine log and special log, then built different forward models for different type of fractured reservoir. The result of forward model show the response of typical fractured reservoir is middle to poor amplitude and low frequency, and the typical high permeable zone is middle to strong amplitude and low frequency. At the same time indicate that we can build the forward model using log data.The third is use routine and rock solid attributes to analyse the fractured reservoir, sum up the response in attributes. For the first time predicted the developed zone of fracture using variety of rock solid attributes and the result is true.The forth is the research of earth stress, first sum up a method to compute the section and 3D data set of earth stress using log and seismic data , at the same time know the earth stress of fractured reservoir is low and the direction of max primary stress is near east-west. For the first time computed the 3D elastic parameters and earth stress, computed the 3D data set of earth stress and fracture pressure gradient, the result is corresponding with fact. The method is creative and will be more extensive use.The fifths using the nonlinear method to make the inversion of fracture apparent density became truth and the result have higher resolution and is an important method to predict fractured reservoir.The sixth creatively use fuzzy-weighted method to predict the plane distribution of facies and fractured zone. The result is corresponding with the fact and show this method have good favourable future.Finally formed a integrated method to research fractured reservoir of tight clastic rock, using facies .sequence, log, earth stress and many attributes.
Keywords/Search Tags:tight clastic rock, fractured reservoir, Xinchang Gas Field, sedimentary facies, sequence, earth stress, nonlinear inversion, rock solid attribute, integrated parameter
PDF Full Text Request
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