源-储分离型凝灰岩致密油藏形成机理与成藏模式

发布时间：2018-05-09 10:49

本文选题：凝灰岩 + 致密油　；参考：《石油学报》2016年08期

【摘要】：由于致密油藏储层致密,原油充注的阻力较大,烃源岩的高剩余压力是致密油藏原油充注的主要动力,因此,致密油藏一般为源内型和近源型。与以往已发现的大多数致密油藏不同,三塘湖盆地马朗凹陷条湖组凝灰岩致密油藏属于源-储分离型致密油藏。通过油源对比、压汞、岩石润湿性和油水驱替实验等方法,结合地质条件综合分析了条湖组凝灰岩致密油藏的类型、原油的来源、原油充注机理和成藏模式。研究表明:凝灰岩致密油藏的原油主要来自下伏芦草沟组二段烃源岩,属于源-储分离型致密油藏;条湖组凝灰岩中沉积有机质生成原油的极性组分优先吸附在孔隙表面,使得岩石润湿性转为偏亲油,加之凝灰岩孔喉比小,从而导致油驱水启动压力梯度较小,这是远源的凝灰岩致密储层内原油能够得以充注成藏和富集的主要原因。凝灰岩内致密油的成藏与富集主要受控于凝灰岩储层质量和芦草沟组二段良好的排烃条件及断裂-裂缝输导体系,其成藏模式为:"自源润湿、它源成藏、断-缝输导、多点充注、有效凝灰岩储层大面积富集"。
[Abstract]:The high residual pressure of source rock is the main driving force of oil filling in dense reservoir, so the tight reservoir is generally of source type and near source type. Unlike most compact reservoirs discovered in the past, the dense tuff reservoirs of Tianhu formation in Marang depression of Santanghu Basin belong to source-reservoir separation type. By means of oil source correlation, mercury injection, rock wettability and oil-water displacement experiments, combined with geological conditions, the types, source of crude oil, oil filling mechanism and reservoir formation model of dense reservoir of tuff in Tianhu formation are analyzed synthetically. The results show that the crude oil of dense tuff reservoir mainly comes from the source rock of the second member of the Lower Luchaogou formation, which belongs to the source-reservoir separation type compact reservoir, and the polar component of the sedimentary organic matter generated crude oil in the tuff of Tianhu formation preferentially adsorbs on the pore surface. The wettability of rocks is turned to oil-friendly and the pore-throat ratio of tuff is small, which leads to the small starting pressure gradient of oil flooding, which is the main reason that the crude oil in the dense reservoir of tuff can be filled and enriched. The reservoir formation and enrichment of dense oil in tuff are mainly controlled by the quality of tuff reservoir and the good hydrocarbon expulsion condition and fault-fracture transportation system in the second member of Lucaogou formation. Multi-point filling, effective tuff reservoir enrichment in a large area.
【作者单位】：中国石油大学油气资源与探测国家重点实验室;中国石油吐哈油田公司;
【基金】：国家自然科学基金面上项目“含有机质沉凝灰岩有机质-玻璃质-微孔隙形成演化关系及致密油藏形成意义”(No.41472111)资助
【分类号】：P618.13

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