| There were 1.5 billion tons proven OOIP of glutenite reservoirs in Shengli Oilfield by the end of 2015, in which 1.03 billion tons have been developed. Glutenite reservoir were formed by debris flow in steep slope, presence of melanges, lead to complex structure inside, fast lithology and facies lateral change, hard to divide sedimentary cycles verticle and reservoir interpretation, all the dificulties made glutenite reservoir cannot be developed effiectively.By means of core observation, sedimentary environment was ascertain in Block Yong1, combined with logging data, the pattern of sedimentary was established, microfacies were fine divided to descript the reservoir changes in space. Base on three-dimensional lithofacies body, research on multi-scale stratigraphic correlation were carried out,accuracy of sedimentary cycles division were improved. based on the relationship between “four properties” of reservoir, multi-mode reservoir interpretation were applied to improve the accuracy of parameter interpretation of reservoir. Influence on physical properties of reservoir by sedimentary and diagenesis were analyzed, finally the law of distribution of the effective glutenite reservoir were summarized to guide the development of this type of reservoir.Based on 264.2m core observation in 3 wells, combined with the laboratory data of grain size, physical properties data, analyze the sedimentary feature of S4 section, fan-delta sedimentary environment is determined, according to the sedimentary characteristics of study area, 3 subfacies(fan-delta plain, fan-delta front and profan-delta) and 5 micorfacies(main channel, interchannel, fan channel, channel front and profan-delta) were determined, method of establishment of fan-delta depositional model is formed.According to the complex characteristics of glutenite lithology, starting from the core analysis data, combined with conventional logging and imaging logging data, selecting lithology sensitivity logs, achieve automatic recognition of lithofacies in 34 wells; summarize different seismic reflection characteristics by the lithofacies in well, three-dimensional lithofacies body were established in PETREL. To carry out the study on evolution pattern of formation, combining the analysis of regional tectonic evolution history and source rock location, understanding lithologic distribution, testing and interpretation of 3-D lithofacies body.Under the control of sedimentary model, multi-scale of division of sedimentary cycles were carried out, seismic data were used to build up the isochronous stratigraphic framework, established 9 layers of 3th level isochronous cycles; under the control of 3-D lithofacies body, using unstable mudstone calibration by well extrapolation, established 31 layers of 4th level isochronous cycles in the study area, the method of the glutenite reservoir sedimentary cycles fine-subdivision were formed.Base on “four properties” of reservoir from cores, lithofacies classification is determined by the cross plot of lithology, forming technology of multi-pattern reservoir model, improve the accuracy of porosity and permeability interpretation, base on NMR experiments, T2 cutoff value of reservoir was determined as 2ms, combine with NMR logging data, the reservoir saturation parameters were calculated, according to the dynamic data to establish the recognition standard and oil-water reservoir and water flooded layer identification chart, 50 wells were evaluated, method of fluid identification in glutenite reservoir were formed.Based on reservoir evaluation of wells, using technology of wavelet reconstruction, 45 glutenite reservoirs distribution between wells were predicted. Combined with the research on reservoir evaluation, analyze feature of effective reservoir connection, pattern of reservoir connectivity in the glutenite reservoir were established. |
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