毛细管力的初次运移及成藏作用有效性分析

发布时间：2018-06-22 12:00

本文选题：毛细管力 + 初次运移　；参考：《高校地质学报》2017年02期

【摘要】：毛细管压力差通常被认为是油气初次运移及源内成藏的重要动力,但毛细管力驱动油由小孔向大孔迁移的前提是岩石孔隙表面亲水。文章结合东营凹陷沙三中亚段成熟烃源岩内砂体含油概率较低,且原油多非来自成熟源岩围岩情况,对砂岩及页岩的润湿性进行了探讨。东营凹陷部分砂岩存在润湿性反转,与较高的非烃及沥青质含量的原油接触,是砂岩润湿性反转的主要原因;而泥页岩烃源岩在大量生烃演化过程中,其整体润湿性也表现为中间润湿甚至亲油性。润湿性改变导致毛细管压力方向改变,初次运移及源内油藏成藏作用减弱甚至消失,是沙三中亚段成熟源岩内砂体含油概率低的主要原因。据此认为,对于高丰度的生烃早期阶段的泥页岩烃源岩,毛细管力作为初次运移及源内油藏成藏动力的作用可能是有限的。
[Abstract]:Capillary pressure difference is generally considered to be an important driving force for primary migration of oil and gas and reservoir formation in source, but the premise of capillary pressure driving oil migration from micropore to macropore is hydrophilic on rock pore surface. In this paper, the wettability of sandstone and shale is discussed in the light of the low oil probability of the sand body in the mature source rock of the third member of the Middle Sha in Dongying Sag, and the fact that the crude oil does not come from the surrounding rock of the mature source rock. Wettability inversion exists in some sandstones in Dongying sag, and contact with crude oil with high non-hydrocarbon and asphaltene content is the main reason for wettability inversion of sandstone. Its overall wettability is also shown as intermediate wettability or even oil-friendly. The change of wettability leads to the change of capillary pressure direction, the primary migration and the weakening or even disappearance of reservoir formation in source, which is the main reason for the low oil content probability of sand body in mature source rocks of the middle part of Sha 3. It is concluded that for shale source rocks with high abundance in the early stage of hydrocarbon generation, the effect of capillary force as the primary migration and reservoir forming power in the source reservoir may be limited.
【作者单位】：中国石化胜利油田分公司勘探开发研究院;西北大学地质学系大陆动力学国家重点实验室;
【基金】：国家自然科学基金项目(41372129;41072096) 国家973课题(2014CB239101;2014CB239105) 中石化科技攻关项目(P15117)联合资助
【分类号】：P618.13

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