The 2nd Edition of Carbonate Reservoirs aims to educate graduate students and industry professionals on the complexities of porosity evolution in carbonate reservoirs. In the intervening 12 years since the first edition, there have been numerous studies of value published that need to be recognized and incorporated in the topics discussed. A chapter on the impact of global tectonics and biological evolution on the carbonate system has been added to emphasize the effects of global earth processes and the changing nature of life on earth through Phanerozoic time on all aspects of the carbonate system. The centerpiece of this chapter—and easily the most important synthesis of carbonate concepts developed since the 2001 edition—is the discussion of the CATT hypothesis, an integrated global database bringing together stratigraphy, tectonics, global climate, oceanic geochemistry, carbonate platform characteristics, and biologic evolution in a common time framework. Another new chapter concerns naturally fractured carbonates, a subject of increasing importance, given recent technological developments in 3D seismic, reservoir modeling, and reservoir production techniques. Detailed porosity classifications schemes for easy comparison Overview of the carbonate sedimentologic system Case studies to blend theory and practice
Two marine evaporative settings are presented in detail: the sabkha and the evaporative lagoon/salina. In each, diagenetic pathways affect porosity evolution in associated marine carbonate sequences, with common dolomitization being a principal factor. Dolomitization is favored where hypersaline waters possess high Mg/Ca ratios (postprecipitation of Ca-bearing evaporites) and potential for hydrologic drive (high fluid densities). Surficial dolomites in modern environments are poorly ordered “protodolomites”. Modern marginal marine sabkha diagenetic environments are thin (
Everywhere they are dancing. From Oklahoma City's huge Red Earth celebration to fund-raising events at local high schools, powwows are a vital element of contemporary Indian life on the Southern Plains. Some see it as tradition, handed down through the generations. Others say it's been sullied by white participation and robbed of its spiritual significance. But, during the past half century, the powwow has become one of the most popular and visible expressions of the dynamic cultural forces at work in Indian country today. Clyde Ellis has written the first comprehensive history of Southern Plains powwow culture-an interdisciplinary, highly collaborative ethnography based on more than two decades of participation in powwows. In seeking to determine what "powwow people" mean by so designating themselves, he addresses how the powwow and its role in contemporary Indian identity have changed over time-along with its songs and dances-and how Indians for nearly a century have used dance to define themselves within their communities. A Dancing People shows that, whether understood as an intertribal or tribally specific event, dancing often satisfies needs and obligations that are not met in other ways-and that many Southern Plains Indians organize their lives around dancing and the continuity of culture that it represents. As one Kiowa elder explained, "When I go to [these dances], I'm right where those old people were. Singing those songs, dancing where they danced. And my children and grandchildren, they've learned these ways, too, because it's good, it's powerful." Ellis tells us not only why and how Southern Plains powwow culture originated, but also something about what it means. He explores powwow's cultural and historical roots, tracing suppression by government advocates of assimilation, Indian resistance movements, internal tribal disputes, and the emergence of powerful song and dance traditions. He also includes a series of conversations and interviews with powwow people in which they comment on why they go to dances and what the dances mean to them as Indian people. An insightful study of performance, ritual, and culture, A Dancing People also makes an important statement about the search for identity among Native Americans today.
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