致密油二次运移动力和阻力实验研究——以四川盆地中部侏罗系为例

发布时间：2019-06-24 13:14

【摘要】：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.
[Abstract]:In order to clarify the dynamic characteristics of secondary migration of unconventional tight oil, two kinds of dynamic simulation experiments were carried out by taking Jurassic in central Sichuan Basin as an example and based on the anatomy of actual geological parameters. The dynamic and resistance characteristics of secondary migration of tight oil are revealed by experimental data and geological parameters. It is considered that the traditional dynamic buoyancy can not overcome the migration resistance in the secondary migration of tight oil, and the abnormal high pressure produced by hydrocarbon generation in source rocks can overcome the resistance to become the main motive force. The results show that the secondary migration resistance of dense oil is in the order of 10 MPa in the simulation experiment, and the upper limit of buoyancy in the corresponding area is only 0.090 65 MPa.. At the same time, the water cut in the tight reservoir is very low, and the water cut of 80% of the wells in the two oilfields is less than 5%, which indicates that there is a lack of material basis for the formation of buoyancy. The experiment of hydrocarbon generation supercharging shows that the peak value of hydrocarbon generation pressure can reach 38 MPa, in the source rock of the study area, which is enough to overcome the resistance and promote oil migration. The production data show that the higher the abnormal high pressure of the tight reservoir in close contact with the source strata is, the more enriched the oil is and the higher the production of a single well is. It is revealed that the accumulation of tight oil is obviously controlled by the supercharging of hydrocarbon generation. The difference of migration and accumulation dynamics leads to the difference of migration distance and distribution between tight oil and conventional oil. This difference accumulation law is of great significance for the differential exploration and deployment of different types of reservoirs in the process of oil field exploration and development.
【作者单位】：中国石油勘探开发研究院;中国石油勘探开发研究院廊坊分院;中国石油西南油气田公司勘探开发研究院;
【基金】：国家科技重大专项(2011ZX05001-001) 中国石油重大科技项目(012E-2601-02;2014B-0307)
【分类号】：P618.13

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