Controlling factors of continental shale oil mobility and resource potential in Dongpu Sag, Bohai Bay Basin
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摘要: 可动性好是陆相页岩油富集高产的关键。通过显微镜薄片观察、扫描电镜、X射线能谱分析、岩石多温阶热解、高压压汞等实验，对渤海湾盆地东濮凹陷古近系沙三段页岩油赋存特征与可动性影响因素进行了分析，并运用盆模法预测了可动油资源的分布。页岩油主要以游离态赋存于粒间孔、晶间孔、溶蚀孔和连通裂缝中，并在裂缝周围富集，成熟度和裂缝发育程度是页岩油可动性主控因素，有机质丰度和孔隙度对其影响相对较复杂。东濮凹陷沙三中、下亚段页岩油资源潜力较大，以中—高熟油为主，可动油纵向上主要分布在3 500~4 500 m，平面上主要分布在洼陷带和内斜坡带，其中前梨园洼陷以及文东内斜坡带、濮卫次洼、柳屯洼陷、海通集洼陷可动油丰度较高，是下一步陆相页岩油重要勘探方向。Abstract: Good mobility is a key to the enrichment and high production of continental shale oil. Various data including thin section observation, scanning electron microscopy (SEM), X-ray energy spectrum (EDS), rock pyrolysis, high pressure mercury injection (HPMI) experiment were integrated to investigate the occurrence characteristics and major factors controlling shale oil mobility in the third member (Es3) of Shahejie Formation in the Dongpu Sag, Bohai Bay Basin. The distribution of movable oil resources was also predicted by using basin modelling. Shale oil mainly exists in intergranular pores, intercrystalline pores, dissolution pores and connected fractures in a free state, and is enriched around fractures. Maturity and fracture development are the main controlling factors of shale oil mobility. The influence of TOC content and porosity on shale oil mobility is relatively complicated. The shale in the middle and lower Es3 in the Dongpu Sag shows a great oil potential, mainly producing medium- and high-maturity oils. Movable oil is mainly distributed at a burial depth of 3 500-4 500 m, and is located in secondary depressions and inner slopes. The Qianliyuan Subsag, Wendong Inner Slope Zone, Puwei Subsag, Liutun Subsag, and Haitongji Subsag have higher movable oil abundances, which are the main exploration targets for continental shale oils.
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图 1 渤海湾盆地东濮凹陷构造区划(a)、地层柱状图(b)及地层剖面(c)
Figure 1. Tectonic units (a), stratigraphic column (b) and geological section (c) of Dongpu Sag, Bohai Bay Basin
图 2 渤海湾盆地东濮凹陷沙三段页岩油镜下赋存空间
Figure 2. Occurrence of shale oil in Es3, Dongpu Sag, Bohai Bay Basin
图 3 渤海湾盆地东濮凹陷卫69井沙三段页岩方解石晶间溶蚀孔及连通裂缝中赋存液态烃及能谱特征
Figure 3. Occurrence and energy spectrum of liquid hydrocarbons in intergranular dissolution pores and connecting fractures in calcites in shale from Es3, Dongpu Sag, Bohai Bay Basin
图 4 渤海湾盆地东濮凹陷沙三段页岩油可动系数分布
Figure 4. Frequency of shale oil mobility coefficients in Es3, Dongpu Sag, Bohai Bay Basin
图 5 渤海湾盆地东濮凹陷沙三段页岩含油性与可动性相关参数与埋深关系
Figure 5. Relationship between oil-bearing and mobility parameters and burial depth of shale in Es3, Dongpu Sag, Bohai Bay Basin
图 6 渤海湾盆地东濮凹陷沙三段可动系数与成熟度和埋深的关系
Figure 6. Mobility coefficient vs. maturity and burial depth of shale in Es3, Dongpu Sag, Bohai Bay Basin
图 7 渤海湾盆地东濮凹陷沙三段可动系数与孔隙度关系
Figure 7. Relationship between mobility coefficient and porosity of shale in Es3, Dongpu Sag, Bohai Bay Basin
图 8 渤海湾盆地东濮凹陷沙三段不同岩相泥页岩孔隙度分布
Figure 8. Frequency of shale porosity in different lithofacies of Es3, Dongpu Sag, Bohai Bay Basin
图 9 渤海湾盆地东濮凹陷沙三段泥页岩可动油与TOC关系
Figure 9. Relationship between TOC and movable oil in shale in Es3, Dongpu Sag, Bohai Bay Basin
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