油气垂向和侧向倒灌运移条件及其聚集规律的差异性

发布时间：2018-04-03 06:06

本文选题：油气　切入点：垂向倒灌　出处：《中国矿业大学学报》2016年05期

【摘要】：以松辽盆地三肇凹陷扶杨油层和渤海湾盆地南堡凹陷中浅层为例,对油气垂向和侧向倒灌运移条件及聚集规律的差异性进行研究.在系统阐述油气侧向倒灌运移所需条件和聚集规律的基础上,从油气运移所需动力条件和聚集分布部位上探讨了二者的差异性.研究结果表明:油气垂向和侧向倒灌运移所需条件不同,油气垂向倒灌运移所需条件是上覆源岩具有超压和发育输导断裂,三肇凹陷青一段源岩古超压约为5 MPa,大于所有遇到的各种阻力之和,且发育有大量SN向展布、断裂密度为0.5~1.8条/km的输导断裂;而油气侧向倒灌运移条件是受到上覆区域性盖层的阻挡,油气不能通过断裂穿过区域性盖层向上运移.垂向和侧向倒灌运移油气聚集规律也不同,垂向倒灌运移油气聚集从上至下逐渐减小,主要聚集在顶部储层中,而侧向倒灌运移油气则主要聚集在区域性盖层之下高的砂地比地层中;垂向倒灌运移油气主要聚集在输导断裂下盘,而侧向倒灌运移油气则主要聚集在输导断裂上盘.
[Abstract]:Three sag in Songliao Basin Zhao Fuyang reservoir and Nanpu Sag in Bohai Bay Basin in shallow layer as an example, to study the difference of oil and gas from the vertical and lateral migration conditions and accumulation of oil and gas. On the basis of systematic and accumulation of lateral migration downward required conditions, from which the desired dynamic conditions migration and accumulation of oil and gas distribution on the differences of the two. The results show that: the vertical and lateral flow of oil and gas migration required for different conditions, oil and gas vertical migration downward conditions needed is overlying source rock with overpressure and development of conducting fracture, three Zhao depression K1qn1 source rocks the pressure is about 5 MPa, more than all kinds of resistance and development, and a large number of SN trending fault system fracture density is 0.5~1.8 /km; and the oil and gas migration is blocked by lateral intrusion of overlying regional caprock, oil and gas can not wear fracture A regional caprock migration. Vertical and lateral migration of oil and gas accumulation from different vertical migration downward of oil and gas accumulation gradually decreased from top to bottom, mainly on the top of the reservoir, and the lateral migration of oil and gas from mainly gathered in the regional seal under high sand ratio in the formation of vertical migration of oil and gas; intrusion mainly gathered in the footwall fault system, and the lateral migration of oil and gas accumulation is mainly from the hanging wall in transporting faults.

【作者单位】：东北石油大学油气藏形成机理与资源评价黑龙江省重点实验室;
【基金】：国家自然科学基金项目(41372153)
【分类号】：P618.13

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