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Abstract
Rios-Lopez, J. J., and A. Cantu-Chapa,
DOI:10.1306/13191087M903336
2009 by The American Association of Petroleum Geologists.
Stratigraphy and Sedimentology of Middle Eocene Kumaza Calcarenites 
Member
in the Ku, Maloob, and Zaap Oil Fields, Offshore Campeche, Mexico
Member in the Ku, Maloob, and Zaap Oil Fields, Offshore Campeche, Mexico
Jaime J. Rios-Lopez,1 Abelardo Cantu-Chapa2
1Petroleos Mexicanos (PEMEX) Exploration and Production, Northeast Marine Region, Campeche, Mexico
2Instituto Politecnico Nacional, Mexico City, Mexico
ACKNOWLEDGMENTS
We thank Petroleos Mexicanos (PEMEX) Exploration and Production for releasing the contents of the material for external publication. This chapter is published with the permission of Gustavo Hernandez-Garcia, Luis Ramos-Martinez, and Adan E. Oviedo-Perez of PEMEX. We especially thank Pedro Salmeron-Urena, Francisco Angeles-Aquino, and Cesar Cabrera-Cuervo for their constructive comments and assistance and many stimulating discussions. We thank Monica Betancourt-Marchant for translating the manuscript to English. The manuscript has benefited from critical reviews of Alula Damte, Tomaz L. Jerzykiewicz, Claudio Bartolini, Robert Gardner, and William A. Ambrose.
ABSTRACT
The middle Eocene Ku, Maloob, and Zaap (Kumaza) Calcarenites Member is formally proposed to describe a calcareous unit represented by one to three, calcite-cemented packstone to grainstone calcarenites in a thick undescribed sequence of shales that occur in the subsurface of Campeche Shelf, southeastern Gulf of Mexico. These calcarenite bodies are here called units 1-A, 1-B, and 1-C; they are separated by one to two shale layers denominated as units Lu-1 and Lu-2.
The type section is in the Maloob 97 well. The Kumaza Member has been studied using seismic data, core, chip samples, and log information from 57 wells drilled in the Kumaza fields in the Campeche Shelf. The Kumaza Member contains the most important reservoir rocks in this region and is mappable more than approximately 100 km2 (39 mi2). These calcarenite banks are here inferred to have originated on a shallow water platform and were later redeposited in deeper waters from a restricted area.
The age of the rock units in the Kumaza Member is established from foraminifera, including Morozovella lenheri, Morozovella spinulosa, Truncorotaloides rohri, Orbulinoides beckmanni, and Lepidocyclina (Polylepidina) antillea.
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