致密砂岩储层孔隙结构对渗流特征的影响——以四川盆地川西地区上侏罗统蓬莱镇组储层为例

发布时间：2018-01-19 16:00

本文关键词： 四川盆地晚侏罗世蓬莱镇组致密砂岩孔隙结构相渗实验可视化微观模型气、水两相渗流特征　出处：《天然气工业》2016年12期 　论文类型：期刊论文

【摘要】：致密砂岩储层孔隙结构复杂、非均质性强,其渗流特征较之于常规砂岩储层存在着较大差异。为此,以四川盆地西部地区上侏罗统蓬莱镇镇组致密砂岩储层为研究对象,基于物性、压汞、核磁等实验数据,在分析储层孔隙结构的基础上,结合相渗实验和可视化微观驱替模型,模拟油气成藏与开发过程中不同类型孔隙结构致密砂岩储层的渗流特征及气、水两相运移机理和分布状态。研究结果表明:1不同孔隙结构储层的气体前缘推进特征均出现类似于树杈状的黏性指进现象,储层孔隙结构越好,束缚水饱和度越低,束缚水状态下的气相相对渗透率越大,气藏更易被开发;2开发后期残余气主要以绕流、卡断以及孔隙盲端等方式形成的封闭气存在于储层中;3不同类型储层的气、水两相相对干扰均较强,生产过程中容易产生气、水同出的现象;4封闭气的存在会严重降低气井产量,而水相的存在则会极大地降低气相相对渗透率,导致低渗透致密砂岩含水气藏后期产水严重,开发难度大,采出程度低,进而严重影响到气井的有效开发生产。
[Abstract]:The pore structure of tight sandstone reservoir is complex and the heterogeneity is strong, and the percolation characteristics of tight sandstone reservoir are different from those of conventional sandstone reservoir. Taking the tight sandstone reservoir of Penglai Zhen formation of Upper Jurassic in the western part of Sichuan Basin as the research object, based on the experimental data of physical property, mercury injection and nuclear magnetic field, the pore structure of the reservoir is analyzed. Combined with phase permeability experiment and visual microscopic displacement model, the percolation characteristics and gas of tight sandstone reservoirs with different types of pore structure in the process of oil and gas accumulation and development are simulated. The results show that the gas front propulsive characteristics of different pore structure reservoirs are similar to that of tree branching, and the better the reservoir pore structure is. The lower the irreducible water saturation is, the greater the gas phase relative permeability is, and the easier the gas reservoir is to be developed. (2) in the late development period, the residual gas mainly exists in the reservoir by the way of flow around, blocking and pore blind end, etc. (3) the relative interference of gas and water is strong in different types of reservoirs, and it is easy to produce gas and water in the process of production; (4) the existence of sealed gas will seriously reduce the production of gas wells, while the existence of water phase will greatly reduce the relative permeability of gas phase, resulting in serious water production in low permeability tight sandstone reservoirs in the later stage, great difficulty in development and low degree of recovery. Thus, the effective development and production of gas wells are seriously affected.
【作者单位】：西南石油大学地球科学与技术学院;中国石油川庆钻探工程公司测井公司;西安昌源石油科技服务有限责任公司;
【基金】：国家科技重大专项“大型油气田及煤层气开发”(编号:2016ZX05052)
【分类号】：TE312
【正文快照】： 大量勘探开发实践及研究成果表明,致密砂岩气藏复杂的渗流特征是影响气井产能和开发的主要因素,而储层岩石微观孔隙结构是影响油气储集及渗流能力的关键。近几年,致密砂岩储层孔隙结构及气、水渗流特征的研究一直成为众多学者关注的焦点。其中,高旺来等人认为致密砂岩储层流体

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