Advances in well logging geology in the era of unconventional hydrocarbon resources
LAI Jin1,2, LI Hongbin2, ZHANG Mei2, BAI Meimei2, ZHAO Yidi2, FAN Qixuan2, PANG Xiaojiao2, WANG Guiwen1,2
1 National Key Laboratory of Petroleum Resource and Engineering,China University of Petroleum(Beijing),Beijing 102249,China; 2 College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China
Abstract：Comprehensive and advanced demands are raised for well logging geology in the era of unconventional oil and gas resources,and new and comprehensive theory and technical systems are urgently to be developed in order to solve the problems in the well logging geology for unconventional oil and gas resources. This paper compares the differences of geological characteristics between conventional and unconventional hydrocarbon resources. Furthermore the matched well log series are introduced,and then the main contents in well log evaluation of unconventional hydrocarbon resources are summarized,in addition,the key points and processes of well log evaluation are clarified. The well log evaluation of source rocks,the related theorical and technical systems as well as their application in resource “sweet spot”optimization are summarized. The LithoScanner is used to determine the mineral content and total organic carbon(TOC)content,and the image log is used for picking out sedimentary structure such as lamina,and then the lithofacies can be determined using well logs. The evaluation of bedding parallel fractures in unconventional hydrocarbon resources is an important,and the integration of conventional well logs and image logs can pick out the fractures in a single well. The evaluation and prediction of geological “sweet spots”should pay attention to the well log responses and comprehensive evaluation of lithofacies,bedding parallel fracture and calculation of reservoir parameters. Lastly the importance of in situ stress fields and brittleness index are emphasized in terms of evaluation and prediction of engineering “sweet spots”. The integration of various resolution geological data,well log data and artificial intelligence will promote the continuous innovations on well logging geology.
LAI Jin,LI Hongbin,ZHANG Mei et al. Advances in well logging geology in the era of unconventional hydrocarbon resources[J]. JOPC, 2023, 25(5): 1118-1138.
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