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北部湾盆地乌石凹陷东区古近系流沙港组二段构造复杂,沉积差异大,横向变化快,对物源和沉积相的认识存在争议。为了查明研究区沉积相分布与演化规律,文中以岩心、测井、地震和分析化验资料为基础,结合区域构造背景,对研究区流沙港组二段沉积物源、沉积相特征及演化规律展开研究。分析认为,流沙港组二段物源来自于北部高地势地区,发育三角洲前缘—深水湖泊沉积序列,主要发育相对远物源的正常三角洲前缘沉积,砂体单层厚度小、多层交互式分布。井震结合由下到上将流沙港组二段划分为4个四级层序,其中MSC2和MSC3层序为短期快速水退到较长期水进过程,物源供给较为充足,砂体发育程度高,是主力砂体展布层段;流沙港组二段储集层物性主要受埋深及沉积相带约束,B油田物性好于A油田,三角洲前缘近源端发育的水下分流河道、河口坝为有利储集层分布区。
The second member of the second member of the Paleogene Liushagang Formation in the eastern Wushi Depression of the Beibuwan Basin is complex in structure with large differences in sedimentation and rapid horizontal variation. There is debate on the understanding of provenance and sedimentary facies. In order to find out the distribution and evolution of sedimentary facies in the study area, based on core, logging, seismic and analytical laboratory data, combined with regional tectonic setting, the sedimentary facies and sedimentary facies of the second member of the Liushishagang Formation in the study area Start researching According to the analysis, the source of the second member of the second member of the Liushagang Formation is from the northern highland region, and the sedimentary sequences of the delta front and deepwater lakes are developed. The sedimentary sequences are mainly from the normal delta front with relatively distant source, the thickness of single sand body is small, Distribution. Well-to-seismic combination from bottom to top will be divided into four fourth-order sequences of the second member of the Lhasha Port Group, of which the sequence of MSC2 and MSC3 is short-term rapid water retreating to the longer-term water inflow with adequate source supply and the degree of sand body development High, which is the main distribution of sand bodies. The reservoir properties of the second member of the Liushagang Formation are mainly controlled by the depth of burial and sedimentary facies. The properties of the B oilfield are better than that of the A oilfield. The underwater distributary channel near the source of the delta front , Mouth dam is favorable reservoir distribution area.