北部湾盆地层序地层格架及其内部构成

本文根据地震剖面、测井曲线及钻孔岩心等资料，运用层序地层学工作方法对北部湾盆地进行了层序地层划分，并在此基础上作了沉积体系分析和相分析。

Study on Architecture of Sequence Stratigraphic Framework of Beibuwan Basin

Beibuwan basin is located on the northern Continental shelf of South China Sea. It is a Cenozoic rifled basin. In this paper, the deposional architecture of sequence stratigraphic frame-work of beibuwan basin is studied. According to the principle of sequence stratigraphy, the au-thors divide basin -fill sequence into two tectonic sequences and eight sequences. parasequences display three kinds of stacking styles which are named progradational parasequence set, aggradational parasequence set and retrogradational parasequence set, respectively. Depositional systein analysis and facies analysis reveal that the architecture of synrifted tectonic sequence is composed of alluvial fan, fan delta, fluvial sediments and lacustrine deposits, whereas the architecture of postrifted tectonic sequence consists of coastal clastic sediments and shallow sea deposits. On the basis of seismic analysis, core studies and well logging interpretation, the au-thors also divide system tracts into three kinds, which are named just like those stacking styles of parasequence sets as mentioned above. Depositional system tracts can reveal the relationship between depositional rates and changes of accomodation.