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东营凹陷北部陡坡带砂砾岩体发育扇根封堵的成岩圈闭。通过岩心观察、粒度分析、薄片鉴定和粘土矿物分析等方法,对研究区扇根和扇中的岩相组构与差异成岩演化进行研究,以揭示成岩圈闭的成因机理,并探讨其形成的主控因素。结果表明,扇根以杂基支撑的砾岩相为主,杂基含量高,抗压实能力弱,机械压实作用阶段,其原生孔隙不易保存,在碱性为主的成岩环境下,以重结晶作用为主,孔隙度、渗透率持续降低;扇中以砂质杂基支撑或颗粒支撑的砾质砂岩相和含砾砂岩相为主,杂基含量较少,抗压实能力较强,在酸性和碱性交替的成岩环境下,成岩作用多样,形成多个次生孔隙发育带。因此,岩相组构是形成成岩圈闭的物质基础,而扇中和扇根的差异成岩演化控制下的物性差异是形成扇根封堵成岩圈闭的内在机制。成岩圈闭的形成主要受到沉积层序、岩相组构和成岩流体的影响。
Sediment - forming diagenetic traps in the steep slope glutenite body in northern Dongying Depression. By means of core observation, particle size analysis, flake identification and clay mineral analysis, the facies and fan diagenetic evolutions of fan-shaped fan and fan in the study area are studied to reveal the genesis mechanism of diagenetic traps and to explore the formation of Master factor. The results show that the fan-root is dominated by hetero-conglomerate facies, with high heteroatom content and weak anti-compaction ability. In the stage of mechanical compaction, the primary pores are not easy to be preserved. In alkaline-dominated diagenetic environments, Recrystallization, porosity and permeability continued to decrease. In fan, gravelly sandstone facies and gravelly sandstone facies supported by sand-based or granular support are dominant, while the content of miscellaneous groups is less and the capability of anti-compaction is stronger In diagenetic environments where acidity and alkaline alternation, diagenesis is diverse and multiple secondary pore development zones are formed. Therefore, the facies structure of the facies is the material basis for forming the diagenetic traps, and the physical differences under the control of the diagenetic evolution between fan and fan roots are the intrinsic mechanisms for the formation of fan-block seal diagenetic traps. The formation of diagenetic traps is mainly affected by sedimentary sequence, lithofacies structure and diagenetic fluid.