松辽盆地齐家地区高台子油层致密油成藏动力研究

发布时间：2018-06-27 11:01

本文选题：致密油 + 成藏动力　；参考：《西安石油大学》2015年硕士论文

【摘要】：松辽盆地齐家地区白垩系发育有两套致密油层,分别是泉头组三、四段的扶余油层和青山口组二、三段的高台子油层。通过对地质资料(构造演化史、储层致密史、成藏史)、测井曲线响应特征的综合分析研究,认为水动力、构造作用力和浮力均不能作为高台子油层致密油的成藏动力,只有超压才能推动石油进入致密储层形成油藏。包裹体测压结果显示,高台子油层在嫩江组末期和明水组末期发生过两次油气充注,而且明水组末期为明显的高压异常,进一步证实石油是由超压推动进入高台子油层。大规模地层超压的形成有泥岩欠压实和有机质生烃增压两种机理,其中欠压实成因超压的保存时期早于储层致密时间,其不是致密油成藏的主要动力,只有生烃增压才能够独立推动石油进入致密储层形成油藏。为了衡量生烃增压提供的动力大小,提出累计最大剩余压力的概念,所谓累计最大剩余压力是指假设烃源岩在一期的连续生烃过程中处于完全封闭环境,没有烃类的排出,生成的烃类全部积蓄在烃源岩的孔隙中时所达到的剩余压力。通过改进后的生油增压计算模型结合盆地模拟技术对青山口组烃源岩在主要成藏时期的累计最大剩余压力进行了计算,结果表明青一段烃源岩生烃产生的超压在明水组末期可达50MPa以上,青二-三段烃源岩可达40MPa以上,远大于烃源岩的破裂压力及致密储层的排驱压力,可以作为致密油成藏的动力。在嫩江组末期成藏时,石油是由欠压实成因的超压和生烃产生的超压共同作用排出烃源岩,从而形成油藏。
[Abstract]:There are two sets of dense reservoirs developed in Qijia area of Songliao Basin, namely Fuyu reservoir of the third and fourth member of the Quantou formation and the Gaotaizi reservoir of the second and third member of the Qingshankou formation. Based on the comprehensive analysis of geological data (structural evolution history, reservoir density history, accumulation history) and the response characteristics of logging curves, it is concluded that hydrodynamics, tectonic forces and buoyancy can not be used as reservoir forming power of dense oil in Gaotaizi reservoir. Only overpressure can push oil into the tight reservoir to form a reservoir. The pressure measurement results of inclusions show that there were two oil and gas filling processes in Gaotaizi oil reservoir at the end of Nenjiang formation and Mingshui formation, and the obvious high pressure anomaly at the last stage of Mingshui formation, which further proves that the oil is pushed into Gaotaizi reservoir by overpressure. The formation of large-scale formation overpressure has two mechanisms: mudstone undercompaction and organic matter hydrocarbon generation pressurization, among which the undercompaction origin overpressure was preserved earlier than the reservoir densification time, and it is not the main motive force for tight oil accumulation. Only hydrocarbon-generating pressurization can independently push oil into tight reservoirs to form reservoirs. In order to measure the power provided by hydrocarbon-generating pressurization, the concept of accumulative maximum residual pressure is put forward. The so-called accumulative maximum residual pressure means that the source rock is assumed to be in a completely closed environment during the first stage of continuous hydrocarbon generation without the expulsion of hydrocarbons. The residual pressure reached when all the generated hydrocarbons are accumulated in the pores of the source rock. The accumulative maximum residual pressure of the source rock of Qingshankou formation during the main reservoir forming period was calculated by using the improved oil source pressurization calculation model and basin simulation technology. The results show that the overpressure generated by source rocks in Qingyi member can reach more than 50 MPA at the end of Mingshui formation and over 40 MPA in the source rocks of the second and third member of Qinghai formation, which is much larger than the fracture pressure of source rocks and the displacement pressure of tight reservoirs. It can be used as the motive force of dense oil accumulation. In the late stage of formation of Nenjiang formation, oil is expelled from source rock by the overpressure caused by undercompaction and hydrocarbon generation, thus forming reservoir.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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