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The AAPG/Datapages Combined Publications Database

Journal of Sedimentary Research (SEPM)

Abstract


Journal of Sedimentary Petrology
Vol. 37 (1967)No. 3. (September), Pages 879-884

Occurrence of Pure, Well-Crystallized 1m Illite in Cambro-Ordovician Sandstone from Rhourde El Baguel Field, Algeria

D. M. Triplehorn

ABSTRACT

Well-crystallized, relatively pure 1 M illite occurs in clay fractions of Cambro-Ordovician sandstones from the Sinclair Mediterranean Petroleum Company Rhourde el Baguel No. 1 well, Algeria. This is the first report of such a clay (well-crystallized 1M, relatively pure) from a sedimentary rock. Preliminary data show that the chemical composition of this clay approaches that of "ideal" muscovite. Petrographic evidence and the lack of a terrigenous source for 1M illite strongly indicate a diagenetic origin. It is suggested that this clay is the result of post-depositional, in-place alteration of feldspars in the presence of saline formation waters.


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