玛湖井区上乌尔禾组砂砾岩水敏伤害机理实验研究  

Experimental Study on the Mechanism of Water-sensitive Injury in Upper Urho Formation Sand and Gravels of the Mahu Well Area

作　　者：叶义平 蒋庆平 梁程 熊千 邱子刚 李胜 贾俊飞 张会勇 YE Yi-ping;JIANG Qing-ping;LIANG Cheng;XIONG Qian;QIU Zi-gang;LI Sheng;JIA Jun-fei;ZHANG Hui-yong(Research Institute of Exploration and Development,Xinjiang Oilfield Company,Kelamayi 834018,China)

机构地区：[1]新疆油田公司勘探开发研究院,克拉玛依834018

出　　处：《科学技术与工程》2022年第27期11895-11903,共9页Science Technology and Engineering

基　　金：中石油重大科技专项(2017E-0415、2017E-0405)。

摘　　要：玛湖井区石油储量潜力巨大,但是敏感性强,其水敏伤害机理也不清楚。为了定量分析玛湖井区上乌尔禾组砂砾岩水敏伤害机理,从水敏伤害评价和水敏伤害微观机理入手,对砂砾岩储集层开展X射线衍射(X ray diffraction, XRD)全岩分析、扫描电子显微镜(scanning electron microscope, SEM)矿物扫描、计算机断层扫描(computed tomography, CT)、原子力显微镜测试分析及相关水敏伤害实验。结果显示:乌尔禾组砂砾岩储层水敏伤害很高,并且产生水敏的主要原因是不同储层颗粒粒径大小不一、岩性差异大、分选性差,且发育微裂缝,成蜂窝结构,力学性质不稳定,使得储层复杂,易受损害。黏土矿物会对孔隙造成损伤,进而损伤渗透率。表面粗糙度越大,与水接触时的表面积相对较大,水敏性强,更容易发生水化膨胀、分散。通过对固液界面接触角和分析表面电荷分布,呈现较强的亲水性,进一步加剧了水敏伤害程度。研究对成果玛湖井区上乌尔禾组致密油的高效开采具有重要意义。The oil reserves potential in the Mahu well area is huge, but the sensitivity is strong and its water-sensitive injury mechanism is not clear. In order to quantitatively analyze the water-sensitive injury mechanism of the Upper Urho Formation sand conglomerate in the Mahu well area, X-ray diffraction(XRD) whole-rock analysis, scanning electron microscope(SEM) mineral scan, computed tomography(CT) scan, atomic force microscopy(AFM) test analysis and related water-sensitive injury experiments were carried out on the sand conglomerate reservoir, starting from water-sensitive injury evaluation and water-sensitive injury micromechanism. The results show that the water-sensitive damage of the sandy conglomerate reservoir of the Urho Formation is high, and the main reasons for the water-sensitivity are the different particle sizes of different reservoirs, the largelithological differences, the poor sorting, and the development of microfractures into a honeycomb structure with unstable mechanical properties, which makes the reservoir complex and vulnerable to damage. Clay minerals can cause damage to the pore space, which in turn damages the permeability. The larger the surface roughness, the relatively larger the surface area in contact with water, the stronger the water sensitivity, and the more likely to occur hydration swelling and dispersion. The degree of water-sensitive damage is further aggravated by the contact angle of the solid-liquid interface and the analysis of the surface charge distribution, which presents a strong hydrophilicity. This study is of great significance for the efficient extraction of tight oil in the Upper Urho Formation in the Mahu well area.

关 键 词：玛湖井区 砂砾岩 水敏伤害 湿润性 表面电性 

分 类 号：TE355[石油与天然气工程—油气田开发工程]