第三纪惠民盆地的沉积相和沉积大地构造演化

山东惠民盆地中所堆积的厚达7000米的第三系地层,主要是陆源碎屑沉积,其次是碳酸盐沉积。解释这些沉积物的沉积环境,显然有助于预测盆地中有利的生、储油相带。我们在分析多项指相标志的基础上,首先总结了主要沉积相的沉积序列和沉积模式,然后概略地描述了不同时期盆地中沉积相的展布,最后将盆地的构造演化与沉积特征相结合,进行沉积大地构造方面的探索。

SEDIMENTARY FACIES AND SEDIMENTARY TECTONICS OF TERTIARY HUIMIN BASIN, SHANDONG PROVINCE

Tertiary Huimin basin is a rift basin. The Cenozoic sediments up to 7000 m thick have been accumulated within this basin. Depositional environments recognized include fluvial, delta, longshore bar and shoal, organic bank, turbidite, deep-water fan, and near-shore subaqueous fan. The sequences and models of these facies are developed. Facies maps at various times are constructed from environmental analysis of individual wells. The ascending facies sequence of the basin consists of alluvial-lake basin bog, lake influenced by the transgression, delta-turbidite, carbonate-organic bank, fluvial-lake, and fluvial facies associations. From the point of view of sedimentary tectonics, the evolution of this basin can be divided into four stages. They are initial rifting (Eocene), early rifting (late Eocene to early Oligoeene), intensively rifting (oligoce-ne), and degenerating-depressing (Late Tertiary) stages. The lithologieal associations developed are correspondingly as follows: red clastic rock, sandstone-mudstone-carbo-nate, dark mudstone-sandstone, and mottled clastic rock associations.