Reservoir Quality of Deepwater Deposits
Published:January 01, 2006
2006. "Reservoir Quality of Deepwater Deposits", Introduction to the Petroleum Geology of Deepwater Setting, Paul Weimer, Roger M. Slatt, Renaud Bouroullec, Richard Fillon, Henry Pettingill, Matthew Pranter, Gabor Tari
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The term “reservoir quality” is commonly applied to the porosity and permeability of reservoir and associated rocks. This chapter focuses on the primary and secondary geologic factors that control the reservoir quality of deepwater sands and sandstones. Primary controls are related to the grain-size distribution of the sediment at the time of deposition. Secondary controls include the degree to which detrital mud infiltrates into pores between sand grains prior to lithification, and the processes of compaction, cementation and dissolution to which the sands are subjected upon burial. Before discussing these factors, we review the common methods of sampling and measurement of porosity and permeability.
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Introduction to the Petroleum Geology of Deepwater Setting
This publication is intended to provide the working geologist, geophysicist, and petroleum engineer with a broad overview of the petroleum systems of deepwater settings. Deepwater depositional systems are the one type of reservoir system that cannot be easily reached, observed, and studied in the modern environment, in contrast to other siliciclastic and carbonate reservoir systems. The study of deepwater systems requires many different remote observation techniques, each of which can only provide information on one part of the entire depositional system. As a consequence, the study and understanding of deepwater depositional systems as reservoirs has lagged behind that of the other reservoir systems, whose modern processes are more easily observed and documented. For this reason, geoscientists use an integrated approach, working in interdisciplinary teams with multiple data types. The types of data used in the study of deepwater deposits include: outcrop studies, 2D and 3D seismic-reflection data (both for shallow and deep resolution), cores, conventional and specialized log suites, biostratigraphy, and well test and production information. These data sets are routinely incorporated into computer reservoir modeling programs for production performance simulation and forecasting. Technologies for deepwater exploration and development are improving rapidly. The intent of this publication is to provide information that will be usable even as the technologies advance beyond what we present here.