鄂尔多斯盆地延长组长7段致密油储层应力敏感性及影响因素

发布时间：2019-02-14 21:22

【摘要】：致密油采用准自然能量开发方式下,对储层的应力敏感性及其控制因素进行研究具有重要的意义。基于地层压力条件下的应力敏感性实验,明确了鄂尔多斯盆地延长组长7段致密油储层主要表现为渗透率的应力敏感性,应力敏感性属弱到中等强度。利用铸体薄片、恒压和恒速压汞、场发射扫描电镜、微米CT成像等测试手段,对长7段不同应力敏感性类型储层的岩石学特征、微观孔隙结构进行系统分析和对比研究,揭示塑性组分含量、填隙物类型及其含量、孔喉尺度是长7段致密油储层应力敏感性不同的主要控制因素。基于长7段致密油开发先导试验区生产实践和储层特征的综合分析,认为在长7段致密油水平井压裂裂缝改造区域,地层压力的快速下降致使应力敏感性对水平井的石油产量和递减率产生显著的影响;同时,在长7段致密油开发过程中,应针对不同物源体系、不同成因类型、不同物性的储层制定不同的开发技术方案,以降低应力敏感性对致密油产能的影响程度。
[Abstract]:It is of great significance to study the stress sensitivity and its controlling factors of tight oil under the development of quasi-natural energy. Based on the stress sensitivity experiments under formation pressure conditions, it is clear that the stress sensitivity of the tight oil reservoirs in Yanchang formation of the Ordos Basin is mainly the stress sensitivity of permeability, and the stress sensitivity is weak to medium strength. By means of casting thin sheet, constant pressure and constant velocity mercury pressure, field emission scanning electron microscope and micron CT imaging, the petrological characteristics and micropore structure of different stress-sensitive reservoirs in Chang 7 are systematically analyzed and compared. It is revealed that the content of plastic components, the types and contents of interstitial matter, and the pore throat scale are the main controlling factors for different stress sensitivity of tight oil reservoirs in Chang7 formation. Based on the production practice and comprehensive analysis of reservoir characteristics in the pilot area for the development of tight oil in section Chang 7, it is considered that in the fracturing fracture reconstruction area of the horizontal well of tight oil in section Chang 7, The rapid decrease of formation pressure results in significant influence of stress sensitivity on the oil production and decline rate of horizontal wells. At the same time, in order to reduce the influence of stress sensitivity on the productivity of dense oil, different development technical schemes should be made for reservoirs with different source systems, different genetic types and different physical properties during the development of dense oil in Chang7 formation.
【作者单位】：中国石油长庆油田公司油藏评价部;中国石油长庆油田公司勘探开发研究院;低渗透油气田勘探开发国家工程实验室;
【基金】：国家重点基础研究发展计划(973)项目“淡水湖盆细粒沉积与富有机质页岩形成机理研究”(2014CB239003) 国家科技重大专项“鄂尔多斯盆地致密油资源潜力、甜点区预测与关键技术应用”(2016ZX05046005)
【分类号】：TE311

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