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Comprehensive Reservoir Evaluation Of Xujiahe Famation Of The West Sichuan By Log Welling In XC Structure

Posted on:2010-07-09Degree:MasterType:Thesis
Country:ChinaCandidate:S Q WangFull Text:PDF
GTID:2120360278960456Subject:Applied Geophysics
Abstract/Summary:PDF Full Text Request
Xujiahe formation of the west Sichuan has great potential in exploration, with abundance hydrocarbon source rocks and sandstone develops as well as good condition of hydrocarbon expulsion. However the reservoir of west Sichuan is super tight and low porosity reservoir with great exploration risk because of complex regional geological evolution and tectonic evolution. fluid identification and fracture prediction of complex lithologic tight reservoir is a problem urgent to be solved at present. Especially in late Trias, the evolvement of Chuanxi sunken has experienced complicated tectonic movement for many times. Its reservoir has undergone drastic diagenic metamorphism,especially compaction and the destruction of carbonate cement and autogent quartz. The highly fine and close in its physical property and the great aeolotropy have brought about a lot of difficulty in the research on the identification of reservoir and fluid.There is an urgent need to resolve the fluid identification of complex lithologic reservoir and fracture prediction. XC area has both conventional and particular logging suite, which are highly detailed. However during the research, we have some shortage in the identification of the nature gas in fine and close clastic reservoir, the lithologic character in complicated ithostratigraphic horizon, and petrophysic parameter, etc, all of which has constrict the accuracy for forecasting. To raise up the returns-ratio in deep zone, it is necessary to built up a technique system for the identification of reservoir fluid, forcasting the developmental section of fissure, searching the abundance zone of nature gas.For these reasons, this paper is comprehensive research with conventional logging, special logging and geological data based. According to complex lithology, this paper starting from a single well has calculated various wells reservoir parameter accurately ,which building up reservoir parameters interpretation models based on core analysis data, at the same time using the advantage of optimization algorithm which can take full account of the effects of underground lithology and fluids. Using histogram and crossplot, we identified the gas,water and layer and make out the electric criterion of Xu2 and Xu4 reservoir. Meanwhile we've fixed the lower limit of effective thickness by summation frequency method. Use resistivity and porosity Intersection method and normal probability distribution method to identify reservoir fluids, and this gave out a discrimination model for tight reservoir fluid identification.The reservoir is tight ,specially xu-2 strata is fracture development,producing formation of high productivity well related to fracture development. the result of fracture identification based on conventional logging is not satisfactory, therefore using the resistivity imaging logging and the conventional well logging interpretation results to identify fracture, to calculate fracture parameters and to research fracture distribution and extension.Use P-and S-wave velocity, Poisson Ratio, Young modulus and other rock physical parameters which extracted from dipole shear wave logging data and acoustic full waveform logging data to analyze characteristics of rock physical parameters and to research the application of reservoir identification.Established reservoir gas-bearing property and lithological character standard which are suit to tight clastic rock of complex lithology in XC area.
Keywords/Search Tags:Xujiahe Formation, tight sandstone, optimization algorithm, resistivity imaging, rock physics
PDF Full Text Request
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