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《Well Logging Technology》 2016-01
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Quantitative Evaluation of Logging Multi-parameter of Sedimentary Microfacies in Ultra-low Permeability Reservoir,GGY Oilfield

JING Cheng;PU Chunsheng;YU Baocai;WANG Bo;ZHOU You;College of Petroleum Engineering,China University of Petroleum;Changqing Division,China Petroleum Logging CO.LTD.;The Fifth Gas Recovery Plant of Changqing Oilfield;College of Energy Resources,China University of Geosciences;  
In the eastern part of northern Shaanxi slope in the Ordos basin,for the features of the low resolution is favorable for identifying the favorable sedimentary microfacies and border facies of ultra-low permeability reservoir with heterogeneity,based on the Chang6 reservoir of GGY oilfield,the relationship between the cause and logging response characteristics of underwater distributary channel in favorable sedimentary microfacies and channel flank in the transition phase,is analysed which shows that changes of the sedimentary environment under the hydrodynamic effect play a controlling role in those of the physical properties of the rock.The logging multi-parameter can indicate changes of the sedimentary energy to feed back the variation characteristics of favorable sedimentary microfacies and border facies.Based on logging response parameters and comprehensive analysis of the sensitivity,which are different types of sedimentary microfacies divided by sedimentogenesis mark,establish is the quantitative evaluation indexsystem,which includes the logging multi-parameter of sedimentary microfacies in the ultra-low permeability reservoir.Meanwhile,the use of the gray theory and associated analytical techniques achieves the model that sedimentary microfacies are transformed into logging facies quantificationally.Thus it enhances the ability of logging quantitative evaluation of sedimentary microfacies,and effectively avoids mistakes brought by using the thickness of sand layers or the ratio of sand to formation to evaluate and divide the sedimentary microfacies.The principle of advantage phase determines the development scale,scope and characteristics of heterogeneity of contiguous superimposed reservoir sand in the favorable sedimentogenesis unit,which is the delta front from the northeast to southwest in Chang 621 formation.So the method provides favorable target and wells for increasing production in ultra-low permeability reservoir.
【Fund】: 国家科技重大专项复杂油气田地质与提高采收率技术(2009ZX05009);; 国家自然科学基金延时式可控高能气体压裂技术动力学机理研究(51104173)联合资助
【CateGory Index】: P618.13;P631.81
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