Logging lithologic interpretation model construction technology and its application in thin reservoir inversion
ZHANG Sheng1, HAN Chunyuan2, DU Xinjiang2, XIA Zhu1, HU Shaohua1, FU Liang-liang2
1. Geological Research Center, GRI, BGP Inc., CNPC, Zhuozhou, Hebei 072750, China; 2. Oil and Gas Reservoir Evaluation Department, Research Institute of Exploration and Development, Huabei Oilfield Company, PetroChina, Renqiu, Hebei 062550, China
Abstract：In tail sands of the lower Paleogene Shahejie Formation in Lixian Slope Zone,Raoyang Sag,Bohai Bay Basin,inter-beds and shallow delta front interfacial sandwich-shallow lake sub-facies are developed.This geological background is characterized by strong heterogeneity,which causes low-resolution seismic data.Lithology cannot be identified only on well logs,and conventional impendence or pseudo-impendence inversion does not work.To solve the problem,we propose in this paper a thin-reservoir prediction method which can be achieved with a geostatistical inversion algorithm based on lithologic-interpretation model building on logging data.The following steps are included:A.Logging data pre-processing is carried out to eliminate the influence of the apparatus type,measure time and logging tool,and borehole environment,and improve the quality of the logging data; B.Lithological-sensitive logs are chosen with well-log correlation analysis.And then based on this,a comprehensive log is obtained,which can exactly recognize lithology and thin reservoirs; C.A unified lithologic interpretation chart is made with square-wave extraction; D.The geostatistical thin-reservoirs inversion is achieved with litholo-gical interpretation results of all the wells and cross-well seismic attributes.Our application results show that the proposed inversion results are well coincident with drilling data,and accurately identify thin reservoirs of 3 to 10 meter thick.The results contribute a lot to remaining oil development in the old oilfield.
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ZHANG Sheng, HAN Chunyuan, DU Xinjiang, XIA Zhu, HU Shaohua, FU Liang-liang. Logging lithologic interpretation model construction technology and its application in thin reservoir inversion. Oil Geophysical Prospecting, 2018, 53(s1): 316-323.
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