Abstract
The Napo Formation of the Oriente Basin plays an important role in the hydrocarbon exploration and production of the Ecuador. This study is based on the data of T block which is located in the eastern part of Ecuador. Evolution sequence is divided through seismic and logging data; facies is determined by core description for each sequence; and finally, the sediment evolution of the Napo Formation can be delineated clearly. The Napo Formation is a transgressive system, where five sequences were formed with the changing sea level. Superimposed retrogradational facies is typical in these sequences. Facies analysis indicates that “T,” “U,” and “M1” units are tide-dominated estuarine deposits involving tidal channel, tidal bar, sand flat, and marsh. In addition, residual delta sandstones were found in the lower part of the “M1” unit, but which is distributed in restricted zones and is hard to identify. Those delta sandstones may indicate that there is a delta before the tide-dominated estuarine deposits. Sedimentary facies changed to shallow-marine shelf in the upper parts of the sequences due to the rising sea level, and marlstone deposited. Based on the facies and sequence study, the sedimentary system and sediments evolution can be known in the Napo Formation. This is helpful to understand the sedimentary conditions of the Napo Formation in the slope belt of the Oriente Basin.
Copyright 2018, Shaanxi Petroleum Society.
This paper was prepared for presentation at the 2018 International Field Exploration and Development Conference in Xi’an, China, 18–20 September, 2018.
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 Committee and are subject to correction by the author(s). The material does not necessarily reflect any position of the IFEDC Committee, its members. Papers presented at the Conference are subject to publication review by Professional Committee of Petroleum Engineering of Shaanxi Petroleum Society. Electronic reproduction, distribution, or storage of any part of this paper for commercial purposes without the written consent of Shaanxi Petroleum Society 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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Zhang, Cq. et al. (2020). Sediments Evolution of Napo Formation in the Slope Belt of Oriente Basin—A Case Study of Block T. In: Lin, J. (eds) Proceedings of the International Field Exploration and Development Conference 2018. IFEDC 2018. Springer Series in Geomechanics and Geoengineering. Springer, Singapore. https://doi.org/10.1007/978-981-13-7127-1_56
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