LOWER TERTIARY SANDBODY TYPES AND DEPOSITIONAL MODEL OF DONGPU FAULTED SALT LAKE BASIN

Dongpu Basin is a faulted basin formed by the disintegration of North China platform due to the intense block movement in Late Mesozoic. Continental sandstone and mudstone interbedded with halite and gypsum rock, 7000m thick, were deposited in Early Tertiary. The centre of the salt lake is in the northern part of the basin, where sandbodies are well developed.According to the sandbody geometry, sedimentary sequence, grain size, rocks and minerals, as well as electric loggin g, four main types of sandbodies can be distinguished.