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Flooding mechanism of biolithite based on progressive ion exchange model: an example of the Wangxuzhuang biolithite reservoir in the Dagang oilfield
Journal of Geophysics and Engineering ( IF 1.4 ) Pub Date : 2021-07-03 , DOI: 10.1093/jge/gxab020
Jianmeng Sun 1 , Xindi Lv 1 , Jie Zong 2 , Shuiping Ma 2 , Yong Wu 2 , Xiaodi Huang 2 , Ming Chi 3 , Xueyin Feng 1 , Weichao Yan 1
Affiliation  

The biolithite reservoir has a strong heterogeneity and complex pore structure, and the changing trend of formation resistivity is complicated during the waterflood development process. In the logging interpretation of a water-flooded layer, mixed-formation water resistivity is a critical parameter and its accurate calculation heavily influences the evaluation of logging water saturation. The commonly used mixed liquid resistivity models have not taken into account the contribution of irreducible clay water and, thus, they are not suitable for biolithite reservoirs with high shale contents. In this paper, a new 3D digital core was constructed based on CT scanning, and a progressive ion exchange model of the mixed-formation water compatible with the biolithite reservoir put forward. Compared with experimental data from core water flooding, the progressive ion exchange model conforms to the resistivity change law of biolithite reservoirs. Through numerical simulation and analysis of the resistivity of biolithite reservoir, it is concluded that the salinity of injected water and the formation water saturation are the main factors affecting the resistivity characteristics of water-flooded layer. In terms of the interpretation of the water-flooded layer, the water saturation was calculated using the progressive ion exchange model through finite element modelling of formation resistivity. The particular mechanism of water flooding and changing law of rock electrical properties during reservoir water injection development are presented, which provide a new reliable basis for optimization of the biolithite reservoir development plan.

中文翻译:

基于递进离子交换模型的生物岩驱油机理——以大港油田王须庄生物岩储层为例

生物岩储层非均质性强,孔隙结构复杂,注水开发过程中地层电阻率变化趋势复杂。在水淹层测井解释中,混合地层水电阻率是一个关键参数,其准确计算严重影响测井含水饱和度评价。常用的混合液体电阻率模型没有考虑束缚粘土水的贡献,因此不适用于页岩含量高的生物岩储层。本文基于CT扫描构建了新的3D数字岩心,提出了与黄岩储层相容的混合地层水的渐进离子交换模型。与岩心注水实验数据相比,递进式离子交换模型符合生物岩储层电阻率变化规律。通过对生物岩储层电阻率的数值模拟和分析,得出注入水矿化度和地层水饱和度是影响水淹层电阻率特征的主要因素。在水淹层的解释方面,通过对地层电阻率的有限元建模,采用渐进离子交换模型计算了含水饱和度。阐述了储层注水开发过程中水驱的特殊机理和岩石电性变化规律,为优化生物岩储层开发方案提供了新的可靠依据。
更新日期:2021-07-03
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