Abstract
Various geological influencing factors of doubtful layers are analyzed and classified according to the logging data in identifying doubtful layers of oil, gas and water. The genesis of doubtful layers is generally classified into geological genesis and engineering genesis. The geological genesis has 4 subclasses of strata, structures, reservoirs and fluids, and more than 20 tertiary subclasses. Engineering genesis can be classified into 6 factors, such as saltwater mud intrusion, well logging series selection and well testing. The characteristics of logging data of stratigraphic unconformity and its influence on logging identification of oil, gas and water in Arys oilfield in South Turgay basin are studied. The controlling factors of the faulted anticline structure Truwa in the eastern margin of the Pre-Caspian sea basin on the distribution of oil, gas and water are analyzed in detail. The geological genesis of low resistivity oil and gas layers in N oilfield in Muglad basin of Sudan and low resistivity reservoir among huge pay in Iraq are analyzed. It is difficult to identify oil, gas and water from logging data due to formation water variation in Bongor basin, Chad. After all, the relationship among porosity, resistivity and reservoir mode of doubtful layers is discussed. It is proposed that the study of doubtful layers should not only pay attention to the formation of reservoirs, but also to the patterns of oil or gas reservoirs, and should pay more attention to the seismic-well tie, so that the breakthrough of the understanding of doubtful layers in wells can play a more important role in studying reservoir distribution and providing well location suggestions.
Copyright 2023, IFEDC Organizing Committee.
This paper was prepared for presentation at the 2023 International Field Exploration and Development Conference in Wuhan, China, 20–22 September 2023.
This paper was selected for presentation by the IFEDC Committee following review of information contained in an abstract submitted by the author(s). Contents of the paper, as presented, have not been reviewed by the IFEDC Technical Team and are subject to correction by the author(s). The material does not necessarily reflect any position of the IFEDC Technical Committee its members. Papers presented at the Conference are subject to publication review by Professional Team of IFEDC Technical Committee. Electronic reproduction, distribution, or storage of any part of this paper for commercial purposes without the written consent of IFEDC Organizing Committee is prohibited. Permission to reproduce in print is restricted to an abstract of not more than 300 words; illustrations may not be copied. The abstract must contain conspicuous acknowledgment of IFEDC. Contact email: paper@ifedc.org.
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Du, Xd., Sha, F., Guo, Hf., Hu, Yl., Guo, Zh. (2024). Classification of Geological Factors in Doubtful Layer of Logging Interpretation and Overseas Case Study. In: Lin, J. (eds) Proceedings of the International Field Exploration and Development Conference 2023. IFEDC 2023. Springer Series in Geomechanics and Geoengineering. Springer, Singapore. https://doi.org/10.1007/978-981-97-0479-8_2
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