中-低成熟湖相富有机质泥页岩含油性及赋存形式——以渤海湾盆地渤南洼陷罗63井和义21井沙河街组一段为例

发布时间：2018-04-01 08:44

  本文选题：含油性　切入点：中-低成熟　出处：《石油与天然气地质》2017年03期

【摘要】：为揭示中-低成熟湖相富有机质泥页岩含油性及其赋存形式,以渤海湾盆地沾化凹陷渤南洼陷罗63井和义21井沙一段取心段为例,采用轻烃校正后的氯仿沥青"A"含量、油饱和指数(OSI)开展了含油性定量评价,采用光薄片和扫描电镜观察以及多温阶热释分析技术,开展了滞留油赋存形式定性、定量研究。结果表明,沙一段富有机质泥页岩含油性较好,经轻烃校正后的氯仿沥青"A"平均含量和油饱和指数(OSI)分别达到1.0%以上和中等含油至油气显示级别,个别层段达到具有页岩油潜力级别;富有机质泥页岩内滞留油除以有机显微组分(沥青质体和层状藻类体等)吸附-互溶态形式赋存外,还赋存于层理缝、构造微裂缝、矿物粒间(晶间)孔隙、粒缘缝以及溶蚀孔隙内。以有机质吸附-互溶态和无机矿物吸附态赋存的重质油占总滞留油的68%~84%(平均达75%),而以游离态赋存的轻质和中质油则占总滞留油的16%~32%(平均25%)。现实可动油量(轻烃校正量与200℃热释轻质油量之和)介于0.62~1.76 mg/g(平均1.12 mg/g),可动油率(现实可动油量与总滞留油量之比)5.39%~9.10%(平均7.06%)。利用200℃时热释放的轻质油量和轻烃校正量之和,可以较合理地对富有机质泥页岩层系的页岩油资源潜力进行快速评价。
[Abstract]:In order to reveal the oil content and occurrence form of middle and low mature lacustrine mudstone shale, taking the core section of Luo 63 well and Yi 21 well sand section of Bonan sag in Zhanhua depression of Bohai Bay basin as an example, the chloroform bitumen "A" content after light hydrocarbon correction was used. Oil saturation index (OSI) carried out quantitative evaluation of oil content, and qualitative and quantitative studies on the occurrence of residual oil were carried out by means of light sheet, scanning electron microscope and multi-temperature thermoluminescence analysis. The oil content of the organic rich shale in Shayi formation is good. After light hydrocarbon correction, the average content of chloroform asphalt "A" and the oil saturation index (OSI) reach above 1.0% and medium oil content to oil and gas level respectively, and some layers reach the level of shale oil potential. In addition to organic macerals (asphaltenes, layered algae, etc.) adsorption-mutual solubilized, the remaining oil in organic shale shale also exists in stratified joints, structural micro-fractures, intergranular (intergranular) pores of minerals, etc. Grain-edge fractures and dissolved pores. Heavy oils in organic adsorption-intersoluble state and inorganic mineral adsorption state account for 680.84% of the total residual oil (an average of 7550%), while light and intermediate oils in the free state account for 160.32% of the total residual oil. The real movable oil amount (the sum of light hydrocarbon correction amount and 200 鈩，

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