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目前陆相湖盆构造活跃期沉积的层序地层研究比较成熟,而对于其萎缩期的准平原沉积的层序地层研究多处于探索阶段。以黄河口地区新近系明下段(湖盆萎缩期沉积)为例,以控制层序发育的古气候变化为线索,分析了古气候变化与湖平面变化的关系,研究了古气候变化引起的孢粉组合、藻类丰度及分异度、粘土矿物成分和含量以及测井GR值的变化特征,并以此作为层序划分的依据;在湖平面变化的基础上,通过基准面变化和A/S变化分析,将明下段层序划分为低位体系域、湖扩张体系域及高位体系域,通过地震反射特征分析对各体系域进行了横向追踪,并讨论了不同体系域砂体的展布特征及其控制因素和对油气成藏的影响。
At present, the research on sequence stratigraphy of the sedimentary active lacustrine basin basin is relatively mature, and the study of sequence stratigraphy of the quasi-plains sediments in the atrophy period is mostly in the exploratory stage. Taking the paleoclimatic and paleoenvironmental changes that controlled the sequence development as an example, taking the Lower Paleocene-Lower Paleozoic sediments of the Yellow River estuary as an example, the relationship between palaeoclimate and lake level changes was analyzed. The composition and content of algae, the composition and content of clay minerals, and the logging GR values. Based on the changes of lake level, the change of base level and A / S variation analysis, the sequence of the next lower sequence is divided into low-level system tract, lake-expansive system tract and high-level system tract. Tracing the tracts by means of seismic reflection feature analysis, and discussing the distribution characteristics of sand bodies in different system tracts And its controlling factors and the impact on hydrocarbon accumulation.