琼东南盆地宝岛地区层序地层和砂体展布特征分析

以层序地层学理论为基础,通过对地震和测井层序进行分析,在琼东南盆地宝岛地区第三系识别出14个地震层序,并分析了各层序的发育特征.总结了不同体系域砂体类型,对各体系域砂体的空间展布进行了详细分析.并指出有利砂体的分布特征:低水位体系域,砂体主要分布在低水位楔、斜坡扇和盆底扇;高水位体系域,主要分布在三角洲、扇三角洲、海底扇和峡谷水道.研究表明,以层序地层学理论为指导,划分层序和体系域,进而对有利砂体进行预测,对该地区油气勘探有重要指导意义. 

ANALYSIS OF THE FEATURES OF SEQUENCE STRATIGRAPHY AND SPATIAL DISTRIBUTION OF SANDSTONEs IN THE BAODAO AREA, QIONGDONGNAN BASIN

Based on the principle of sequence stratigraphy, according to the analysis of seismic and well-log sequence stratigraphy, fourteen seismic depositional sequences are identified in the Tertiary of the Baodao area, Qiongdongnan basin, and the characteristics of various sequences are analyzed. In addition, the paper summarizes sandstone types in different systems tracts and analyzes in detail the spatial distribution of sandstones in different systems tracts. The study shows that the advantageous sandstones in the area have the following distribution characteristics: in the environment of growth faults, sandstones are mainly distributed in the downthrown block of a boundary fault; in a lowstand systems tract, sandstones are mainly distributed in lowstand wedges, slope fans, basin-floor fans, fan deltas, deltas and submarine canyons; in a transgressive systems tract, sandstones are mainly distributed in sandbars and sand-beaches; and in a highstand systems tract, sandstones are mainly distributed in deltas, fan deltas and submarine fans.