渤海湾盆地渤南洼陷沙三下亚段泥页岩非均质性特征及演化模式——以罗69井为例

发布时间：2018-03-05 16:05

  本文选题：非均质性　切入点：演化模式　出处：《石油与天然气地质》2017年02期 　论文类型：期刊论文

【摘要】：通过岩心观察和样品测试数据综合分析,在总结前人层序格架研究成果的基础上,对渤海湾盆地济阳坳陷渤南洼陷古近系沙河街组三段下亚段湖相泥页岩的多重非均质性特征和演化规律进行研究。结果表明:沙三下亚段为一个三级层序,层序内可识别出湖扩体系域(EST)、早期高位体系域(EHST)和晚期高位体系域(LHST)。岩相组合、矿物组成、藻类化石、有机碳含量和有机质类型都在沙三下亚段层序格架内发生明显的规律性变化。其中,岩相组合方面共识别出6种岩相类型,各岩相的矿物组成从EST到LHST,粘土矿物、石英和长石含量增加,方解石和白云石含量减少,黄铁矿含量在EHST最高。藻类化石在LHST种类及丰度最为发育,有机碳含量在EST最低,有机质类型以Ⅰ型和Ⅱ1型为主。沙三下亚段泥页岩含油性受多重非均质性特征综合影响,对比分析认为EHST含油性最好,同时也是最具潜力的页岩油目的层段。
[Abstract]:Based on the comprehensive analysis of core observation and sample test data, and on the basis of summarizing the previous research results of sequence framework, The multilevel heterogeneity and evolution of lacustrine shale in Lower member 3 of Shahejie formation, Paleogene in Bonan Depression, Jiyang Depression, Bohai Bay Basin, have been studied. The results show that the lower submember of Sha 3 is a third order sequence. In the sequence, EST, EHST and LHST.lithofacies assemblage, mineral composition, algal fossils can be identified in the lacustrine extension system tracts, early high system tracts and late high system tracts. The organic carbon content and organic matter type all changed regularly in the sequence framework of the lower member of the lower part of Sha 3.Of6 lithofacies types were identified in the lithofacies assemblage, and the mineral composition of each lithofacies ranged from EST to LHST, clay minerals, clay minerals, clay minerals, clay minerals, clay minerals, clay minerals, clay minerals, clay minerals, clay minerals, and clay minerals. The contents of quartz and feldspar increased, calcite and dolomite decreased, pyrite content was highest in EHST, algal fossils were most developed in LHST species and abundance, and organic carbon content was the lowest in EST. The types of organic matter are mainly type I and type 鈪，

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