低渗致密砂岩储层充注模拟实验及含气性变化规律——以鄂尔多斯盆地苏里格气藏为例

发布时间：2018-02-24 15:04

本文关键词： 砂岩储层充注机理充注物理模拟源储压力含气性苏里格气藏　出处：《中国矿业大学学报》2017年06期 　论文类型：期刊论文

【摘要】：低渗致密气藏复杂的储层特征和充注机理是导致其气藏压力与含气性与常规砂岩迥异的关键因素.选取苏里格气藏42块岩心,开展气藏充注模拟实验,实验中考虑温度影响,逐级增加充注动力,模拟储层低速缓慢充注过程.系统研究了储层物性、充注动力、充注温度3个关键因素对充注成藏的影响,分析了充注过程中气、水产出机理,提出了含气性与储层物性、充注动力为正相关的对数函数关系.研究结果表明:1)低渗致密储层存在充注门限压力,渗透率0.10mD和0.01mD的储层,充注门限压力达2.0 MPa和10.0 MPa.开始进气后,源储压力存在平衡过程,储层越致密,门限压力越高,平衡过程越慢,最终平衡压力越高.2)门限压力和平衡压力是储层含气性变化的拐点,将充注过程划分为3个不同阶段:临界进气阶段,快速增长阶段和平缓增长阶段.不同阶段含气性上升速度和幅度不同,孔隙出水部位不同.3)相同储层及充注动力时,提高充注温度,含气性可上升5%~10%.
[Abstract]:The complex reservoir characteristics and filling mechanism of low permeability tight gas reservoir are the key factors leading to the difference between the pressure and gas bearing property of the gas reservoir and the conventional sandstone. 42 cores of Sulige gas reservoir are selected to carry out the gas reservoir filling simulation experiment, and the influence of temperature is taken into account in the experiment. The effects of three key factors, including reservoir physical properties, charging power and filling temperature, on reservoir formation are systematically studied, and the mechanism of gas and aquatic production in the process of filling is analyzed. The logarithmic relationship between gas-bearing properties and reservoir physical properties and filling power is proposed. The results show that there are reservoirs with filling threshold pressure, permeability 0.10mD and permeability 0.01mD in low permeability tight reservoirs. The filling threshold pressure is up to 2.0 MPa and 10.0 MPA. After the inlet gas, the source and storage pressure is balanced. The denser the reservoir is, the higher the threshold pressure is, and the slower the equilibrium process is. The higher the final equilibrium pressure is. 2) the threshold pressure and the equilibrium pressure are the inflection points of the change of the gas-bearing property of the reservoir. The filling process is divided into three different stages: the critical gas intake stage. At the same reservoir and charging power, the filling temperature can be increased by 5% and 10% when the gas content of different stages is different, and the range and amplitude of gas content are different, and the pore outlet water position is different at the same reservoir and charging power.
【作者单位】：中国矿业大学地球科学与测绘工程学院;中国石油勘探开发研究院廊坊院区;长庆油田苏里格研究中心;中国石油西南油气田分公司研究院;
【基金】：国家科技重大专项(2011ZX05013-002)
【分类号】：P618.13

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