有效介质对称导电理论在复杂泥质砂岩中应用基础研究

发布时间：2018-01-26 17:38

本文关键词： 有效介质对称导电理论纯砂岩非阿尔奇规律泥质砂岩并联导电和串联导电理论和实验比较　出处：《地球物理学进展》2016年04期 　论文类型：期刊论文

【摘要】：复杂泥质砂岩储层的饱和度评价一直是测井解释领域亟待解决的难点和热点问题,基于并联导电理论和阿尔奇公式建立的导电模型扩展性有限,在一定程度上限制了该类模型扩展描述孔隙结构更复杂的高泥高钙砂岩储层的导电规律,而有效介质对称导电理论能很好地描述复杂泥质砂岩储层导电规律,具有很好的应用前景,但仍需深入研究.首先针对纯砂岩,使用有效介质对称导电理论建立纯砂岩有效介质对称导电模型,理论分析与实验研究表明纯砂岩有效介质对称导电模型优于阿尔奇方程,不但可以描述纯砂岩阿尔奇规律,而且可以描述纯砂岩非阿尔奇规律,并且满足当孔隙度等于1时地层因素等于1,以及当含水饱和度等于1时电阻增大系数等于1的物理约束,可更好地描述纯砂岩导电规律.其次,针对分散泥质砂岩,使用有效介质对称导电理论建立泥质砂岩有效介质对称导电模型,理论分析与实验研究表明,泥质砂岩有效介质对称导电模型优于泥质电阻率模型和双电层模型,不需要采用经验拟合就能完整地描述饱含水分散泥质砂岩的电导率与地层水电导率之间曲线和直线关系,模型预测的粘土含量和粘土电导率变化对岩石导电规律的影响与理论认识相符,可更好地描述分散泥质砂岩导电规律.第三,针对两组分混合介质,使用有效介质对称导电理论、并联导电理论、串联导电理论,分别建立了有效介质对称导电方程、并联导电方程、串联导电方程,理论比较表明有效介质对称导电理论与并联导电理论和串联导电理论均不等价,即当两种组分混合介质遵循并联或串联导电规律时,混合介质的导电规律不能用有效介质对称导电理论描述.有效介质对称导电理论能够描述骨架和水以及粘土均为连续项的岩石导电规律.它通过引入渗滤指数和渗滤速率几何参数来描述各种组份的连通性、表面的粗糙度、形状、润湿性等对岩石导电性的影响,因此,有效介质对称导电理论的适用性更广,可用于描述孔隙结构更复杂的高泥高钙砂岩储层的导电规律.
[Abstract]:Saturation evaluation of complex shaly sandstone reservoir has been a difficult and hot problem to be solved in logging interpretation field. The expansion of conductive model based on parallel conduction theory and Archie formula is limited. To a certain extent, this kind of model is limited to describe the conductivity law of high shale and high calcium sandstone reservoir with more complex pore structure, and the effective medium symmetric conductive theory can well describe the conductivity law of complex shaly sandstone reservoir. It has a good application prospect, but it still needs further study. Firstly, the effective medium symmetric conductive model is established for pure sandstone by using the effective medium symmetric conductive theory. Theoretical analysis and experimental study show that the symmetric conductive model of effective medium in pure sandstone is superior to the Archie equation, which can not only describe the Archie law of pure sandstone, but also describe the non-Archie law of pure sandstone. In addition, when the porosity is equal to 1:00, the formation factor is equal to 1, and when the water saturation is equal to 1:00, the coefficient of resistance increase is equal to 1, the conductivity of pure sandstone can be better described. Secondly. For dispersed argillaceous sandstone, the effective medium symmetric conductive model is established by using the theory of effective medium symmetry conductivity. The theoretical analysis and experimental study show that the model is effective. The symmetric conductivity model of effective medium in argillaceous sandstone is superior to that of resistivity model and double electric layer model. The curve and linear relationship between conductivity and formation water conductivity of water-rich dispersed argillaceous sandstone can be described completely without using empirical fitting. The influence of clay content and clay conductivity change predicted by the model on rock conductivity is consistent with the theoretical understanding, which can better describe the conductivity law of dispersed shaly sandstone. Thirdly, for the mixed medium of two components. Using the effective medium symmetric conduction theory, the parallel conduction theory and the series conduction theory, the effective medium symmetric conduction equation, the parallel conduction equation and the series conduction equation are established respectively. The theoretical comparison shows that the effective medium symmetric conduction theory is not equivalent to the parallel conduction theory and the series conduction theory, that is, when the two kinds of mixed media follow the parallel or series conduction law. The conductive law of mixed medium can not be described by symmetric conductive theory of effective medium. The theory of symmetric conductivity of effective medium can describe the conductivity of rock with continuous terms of skeleton, water and clay. It can be described by introducing the percolation index and the. The geometric parameters of percolation rate are used to describe the connectivity of various components. The influence of surface roughness, shape and wettability on the conductivity of rock makes the theory of effective medium symmetric conduction more applicable. It can be used to describe the conductivity of high mud and high calcium sandstone reservoirs with more complex pore structure.
【作者单位】：东北石油大学地球科学学院;非常规油气成藏与开发省部共建国家重点实验室培育基地;
【基金】：国家自然科学基金项目(41274110)资助
【分类号】：P618.13;P631.3
【正文快照】： 1.东北石油大学地球科学学院,大庆1633182.非常规油气成藏与开发省部共建国家重点实验室培育基地,大庆1633181.College of Geo-science,Northeast Petroleum University,Heilongjiang Daqing 163318,China2.Accumulation and Development of Unconventional Oil and Gas,State

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