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A new model for predicting irreducible water saturation in tight gas reservoirs

Petroleum Science 2020年第4期17卷 1087-1100页

作者： Yu-Liang Su Jin-Gang Fu Lei Li Wen-Dong Wang Atif Zafar Mian Zhang Wei-Ping Ouyang School of Petroleum Engineering China University of Petroleum(East China)Qingdao 266580ShandongChina Department of Petroleum Technology University of KarachiKarachiPakistan Changqing Downhole Technology Company Chuanqing Drilling Engineering Co.LtdCNPCXi’an 710018ShaanxiChina

The irreducible water saturation(Swir) is a significant parameter for relative permeability prediction and initial hydrocarbon reserves ***,the complex pore structures of the tight rocks and multiple factors of the formation conditions make the parameter difficult to be accurately predicted by the conventional methods in tight gas *** this study,a new model was derived to calculate Swir based on the capillary model and the fractal *** model incorporated different types of immobile water and considered the stress *** dead or stationary water(DSW) was considered in this model,which described the phenomena of water trapped in the dead-end pores due to detour flow and complex pore *** water film,stress effect and formation temperature were also considered in the proposed *** results calculated by the proposed model are in a good agreement with the experimental *** proves that for tight sandstone gas reservoirs the Swir calculated from the new model is more *** irreducible water saturation calculated from the new model reveals that Swir is controlled by the critical capillary radius,DSW coefficient,effective stress and formation temperature.

关键词： Fractal theory Stress dependence effect Capillary model Tight sandstone gas reservoir irreducible water saturation

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A new NMR-data-based method for predicting petrophysical properties of tight sandstone reservoirs

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能源地球科学(英文) 2023年第2期4卷 64-71页

作者： Mi Liu Ranhong Xie Jun Li Hao Li Song Hu Youlong Zou Petroleum Exploration and Production Research Institute SINOPECBeijing100083China State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum(Beijing)Beijing102249China

Evaluating the permeability and irreducible water saturation of tight sandstone reservoirs is *** study uses distribution functions to fit measured NMR T_(2)distributions of tight sandstone reservoirs and extract parameters for characterizing pore size *** parameters are then used to establish prediction models for permeability and irreducible water saturation of *** of comparing the fit of the T_(2)distributions by the Gauss and Weibull distribution functions show that the fitting accuracy with the Weibull distribution function is *** physical meaning of the statistical parameters of the Weibull distribution function is defined to establish nonlinear prediction models of permeability and irreducible water saturation using the radial basis function(RBF)*** coefficients between the predicted values by the established models and the measured values of the tight sandstone core samples are 0.944 for permeability and 0.851 for irreducible water saturation,which highlight the effectiveness of the prediction models.

关键词： NMR Permeability irreducible water saturation Tight sandstone Weibull distribution function RBF

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Pore structure characterization based on NMR experiment: A case from the Shanxi Formation tight sandstones in the Daning-Jixian area, eastern Ordos Basin

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能源地球科学(英文) 2023年第3期4卷 266-275页

作者： Yunxi Teng Chuang Er Jingzhou Zhao Qiqi Guo Congmin Shen Shijin Tan School of Earth Sciences and Engineering Xi’an Shiyou UniversityXi’anShaanxi710065China Shaanxi Key Laboratory of Petroleum Accumulation Geology Xi’anShaanxi710065China

The study of pore structure requires consideration of important factors including pore throat size,pore radius composition,and pore-throat *** the nuclear magnetic resonance(NMR)experimental results contain rich information about pore structures and fluid occurrence states,this study investigated the pore structures of the tight sandstone reservoirs of the Shanxi Formation in the Daning-Jixian area,eastern Ordos ***,by making the inverse cumulative curve of the NMR T2 spectrum coincide with the capillary pressure curves which were obtained by the mercury injection capillary pressure(MICP)technique,this study derived a conversion coefficient that can be used to convert the NMR T2 spectrum into the pore throat radius distribution curves based on the NMR experimental ***,we determined the pore radius intervals corresponding to irreducible water distribution using the NMR-derived pore radius distribution ***,the NMR T2 distribution curves based on the fractal theory were analyzed and the relationships between fractal dimensions and parameters,including permeability,porosity,reservoir quality index(RQI),flow zone indicator(FZI),irreducible water saturation,RT35,and RT50,were also *** NMR-derived pore throat radius distribution curves of the study area are mainly unimodal,with some curves showing slightly bimodal *** irreducible water mainly occurs in small pores with a pore radius less than 100 *** the permeability decreases,the contribution rate of small pores to the irreducible water gradually *** NMR-based fractal dimensions of pores show a two-segment *** pores have small fractal dimensions and are evenly distributed,while large pores have large fractal dimensions and complex pore *** fractal dimension of large pores(Dmax)is poorly correlated with porosity but strongly correlated with FZI,RQI,RT35,and *** results indicate that large pores are the ma

关键词： Pore structure Nudear magnetic resonance(NMR) Pore size distribution Fractal dirnension irreducible water saturation

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Study on Geological Genesis and Sedimentary Model of Complex Low Resistivity Reservoir in Offshore Oilfield — A Case of NgIII Formation of X Oilfield in Bohai Sea

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Journal of Geoscience and Environment Protection 2023年第4期11卷 157-169页

作者： Wentong Zhang Jie Tan Feiteng Wang Songru Mu Bowei Liu Bohai Oilfield Research Institute CNOOC Ltd.-Tianjin Tianjin China

In order to study the micro genetic mechanism and main geological controlling factors of low resistivity reservoir in NgIII formation of X oilfield in Bohai sea in China, the clay mineral composition, irreducible water saturation, salinity and conductive minerals of low resistivity reservoir were studied by using the data of core, cast thin section and analysis, and compared with normal resistivity reservoir. At the same time, the control effect of sedimentary environment on low resistivity reservoir was discussed. The results show that the additional conductivity of high bound water content and high montmorillonite content in the reservoir together leads to the significant reduction of reservoir resistivity, which is the main microscopic cause of the formation of low resistance, and is mainly controlled by the sedimentary background such as paleoclimate and sedimentary cycle. During the deposition period of NgIII formation, the paleoclimate was dry and cold, and it was at the end of the water advance of the medium-term sedimentary cycle. The hydrodynamic force of the river channel was weak, the carrying capacity of the riverbed was weak, and the river channel swayed frequently, resulting in fine lithologic particle size, high shale content and complex pore structure of the reservoir, resulting in significant reduction of reservoir resistance. The research conclusion would have strong guiding significance for the development of low resistivity reservoirs in this area.

关键词： Low Energy Braided River Low Resistivity Reservoir irreducible water saturation Clay Minerals Paleoclimate Hydrodynamic Force

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