Six million year diagenetic history, North Coles Levee, San Joaquin Basin, California

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Abstract
Summary: North Coles Levee is an uppermost Miocene turbidite sandstone reservoir in the San Joaquin Basin. The sands have undergone progressive burial and a complex history of siderite, dolomite and calcite cementation. Precipitation of calcite cement bands occurred between 40 and 80°C with the last cementation event corresponding to about 2.5 Ma bp . Between this time and the present, extensive dissolution of plagioclase and calcite resulted from influx of acid during kerogen maturation. Emplacement of 500 million barrels of oil closely followed or was contemporaneous with these events. Very late stage compaction effects including albitization of plagioclase and dolomite crystallization in crushed biotite have resulted from cement removal and/or fluid pressure drops during release of the gas cap.