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为阐明非常规致密油二次运移动力特征,以四川盆地中部侏罗系为例,基于实际地质参数解剖,采集研究区岩心样品开展了两类动力学模拟实验.通过实验数据和地质参数揭示了致密油二次运移的动力和阻力特征.认为在致密油的二次运移中,传统动力浮力无法克服运移阻力,烃源岩生烃产生的异常高压则能克服阻力成为主要动力.研究结果表明:致密油二次运移阻力在模拟实验中数值处于10 MPa数量级,对应地区浮力上限仅0.090 65 MPa.同时,现场致密油层中含水率极低,两个油田80%的产井含水率低于5%,表明浮力缺乏形成的物质基础.生烃增压实验则表明,研究区源岩生烃增压峰值可达38 MPa,足以克服阻力促使石油运移.生产数据表明,与烃源岩层紧密接触的致密油层异常高压越大,石油越富集,单井产量越高,揭示致密油的聚集受生烃增压的明显控制.运聚动力的不同,导致致密油与常规石油在运移距离和分布上的差异性,这种差异性成藏规律,对于油田勘探开发过程中针对不同类型油藏开展差异化勘探部署具有重要意义.
In order to clarify the dynamic characteristics of unconventional secondary oil migration, taking the Jurassic in the central part of Sichuan Basin as an example, two types of dynamic simulation experiments were carried out based on the actual geological parameters of the core samples collected in the study area. The experimental data and geological parameters were revealed The dynamic and resistive characteristics of the secondary migration of tight oil are considered.The traditional dynamic buoyancy can not overcome the migration resistance in the secondary migration of tight oil and the abnormal high pressure generated by the hydrocarbon generation in the source rock can overcome the resistance as the main driving force. The results show that the resistance of secondary tightness of tight oil in numerical simulation is 10 MPa and the upper limit of buoyancy is only 0.090 65 MPa. Meanwhile, the water content of tight oil field in the field is very low, and 80% Less than 5% indicates the material basis for the lack of buoyancy.The experiments of hydrocarbon generation and pressurization show that the peak value of hydrocarbon generation and pressurization of source rocks in the study area can reach 38 MPa, which is enough to overcome the resistance to promote oil migration.The production data show that, The higher the pressure of tight oil layer in close contact is, the more oil is enriched and the higher the output of single well is, which reveals that the accumulation of tight oil is obviously controlled by hydrocarbon generation and pressurization. And conventional oil difference in migration distance and distribution of this difference accumulation rule, for oil exploration and development process to carry out exploration and deploy differentiated for different types of reservoirs is important.