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Subsurface deltaic sand bodies have produced considerable quantities of hydrocarbon; yet their variable geometry and interfingering relationships have not been systematically studied. The first attempt at such a delta comparison was made by Credner (1878), who compiled known data on several major deltas. Samajlov's (1956) discussion of •deltaic processes was accompanied by descriptions of 65 rivers. Little attempt was made, however, to compare forms and processes between deltas inasmuch as most of his work was descriptive. Silvester and LaCruz (1970) attempted to evaluate and compare parameters between deltas by statistical methods. This initial effort indicated a need for more detailed systematic comparisons of the parameters between deltas. In the early 1960s the Coastal Studies Institute of Louisiana State University began a systematic study of deltaic environments. The major objectives were (1) to ascertain the variability of process environments and forms displayed by modern-day river systems, (2) to relate specific dynamic processes to resulting deltaic sedimentary environmental charac-teristics; and (3) to establish the linkage between major process environments in deltas in a three-dimensional deltaic framework so that recognizable lateral and vertical sequences could be established. The delta project consisted of systematically acquiring, tabulating, and generating similar information (approximately 400 parameters) for major deltas so that comparisons could be made which would indicate the processes that exert significant control in delta facies. Although 55 deltas were chosen, only 34 had sufficient data for statistical comparisons. The approach used in the study is illustrated in Figure 52.

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