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physical simulation experiment and numerical inversion of the full life cycle of shale gas well

Petroleum Research 2019年第2期4卷 181-190页

作者： Shusheng Gao Huaxun Liu Liyou Ye Zhiming Hu Weiguo An Research Institute of Petroleum Exploration&Development CNPCBeijing100083China Department of Porous Flow&Fluid Mechanics Research Institute of Petroleum Exploration&DevelopmentPetroChinaHebeiLangfang065007China

The ultra-low porosity and permeability,as well as complex occurrence and transport state of shale reservoir make it possess special L-type production characteristic curve and complicated shale gas flow *** solve the difficulty of collecting complete production data due to short production time and operation discontinuity,a full-diameter core physical simulation experiment on the full lifecycle production process of shale gas well depletion is conducted with the purpose of obtaining many important production data including complete pressure and daily gas output in the simulated production process of shale gas *** experimental results show the production characteristic from simulation is consistent with those from gas *** on the simulation data,the critical desorption pressure(12 MPa)of core,free gas production(3820.8 mL),adsorbed gas production(2151.2 mL),the proportion of the daily gas production between free and absorbed gas under different time and formation pressure,as well as the production time and final recovery rate corresponding to abandoned pressure,can be determined *** inversion is carried out to calculate the production performance curve of shale gas well and predict the development effect of gas well based on well testing and similarity analysis of the dimensionless time between core experiment and gas well ***,the permeability and the fracturing effect(fracture network density)as the keys to the effective development of shale gas reservoirs are *** permeability is the fundamental factor and the fracturing technology is the major means.

关键词： Shale gas well Full lifecycle physical simulation experiment Numerical inversion Similarity theory Permeability Fracturing effect

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Fault reactivation in No.4 structural zone and its control on oil and gas accumulation in Nanpu sag,Bohai Bay Basin,China

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Petroleum Exploration and Development 2022年第4期49卷 824-836页

作者： LIU Lu SUN Yonghe CHEN Chang LOU Rui WANG Qi Earth Science College Northeast Petroleum UniversityDaqing 163318China Institute of Chongqing Unconventional Oil and Gas Development Chongqing University of Science and TechnologyChongqing 401331China Chongqing Key Laboratory of Complex Oil&Gas Field Exploration and Development Chongqing 401331China Liaohe Oilfield Company CNPCPanjin 124010China

Based on seismic and drilling data,the reactivation mechanism of the pre-existing basement F4 strike-slip faultin Nanpu sag and its controlling effect on hydrocarbon accumulation difference are systematically *** defining fault activation stages,back-stripping fault throw and physical modeling,it is found that the Nanpu No.4 structural zone formed by the Cenozoic reactivity of the F4 fault grew from south to north,with strike-slip deformation dominated in the south and extensional deformation dominated in the *** in the No.4 structural zone and those in the adjacent No.2 and No.3 structural zones were different fault systems,which grew separately,contacted and connected,and finally interwove under the action of unified stress *** constructing the identification chart of deformation mechanisms of reactivation of pre-existing faults,it is concluded that during the sedimentary period of the Paleogene Shahejie Formation,F4 fault was reactivated by strike-slip faulting,and during the sedimentary period of Paleogene Dongying Formation and Neogene Guantao-Minghuazhen formations,it was reactivated by oblique *** controlling effects of Cenozoic reactivation of F4 fault on hydrocarbon accumulation include:(1)As the oil-source fault,it controlled the vertical cross-layer migration of oil and gas.(2)It gave rise to strike-slip transfer zone to control the distribution of sand bodies.(3)It grew upward and interacted with faults in the neighboring area,controlling the formation of two types of traps,and was favorable for oil and gas accumulation.

关键词： Bohai Bay Basin Nanpu sag Cenozoic strike-slip fault pre-existing fault fault reactivation identification template physical simulation experiment hydrocarbon accumulation

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