构造-岩性油藏油水微观分布规律与主控因素探讨  

Microscopic Distribution Rules of Oil and Water in Structural-Lithologic Reservoirs and Primary Controlling Factors

作　　者：张创[1,2] 孙卫[1] 杨建鹏[3] 解伟 杨姣 杨希濮 陈芳萍 

机构地区：[1]西北大学地质学系大陆动力学国家重点实验室,陕西西安710069 [2]陕西延长石油(集团)有限责任公司研究院,陕西西安710069 [3]延长油田股份有限公司南区采油厂,陕西延安716000 [4]中海油研究总院,北京100027

出　　处：《地质与勘探》2011年第3期518-523,共6页Geology and Exploration

基　　金：国家科技支撑计划“低(超低)渗透油田高效增产改造和提高采收率技术与产业化示范”资助(2007BAB17B00)

摘　　要：在对油水接触面形态和油水过渡带厚度的分布规律进行定量分析的基础上,以苏北盆地花17断块为例,结合油井生产动态特征分析了构造-岩性油藏中油水分布规律,并探讨了其影响因素。结果表明,在实际油藏中油水接触面是一个呈波状起伏的面,其在自由水面以上的高度随残余油饱和度下的毛管压力增大而抬高;油水过渡带厚度仅与束缚水饱和度和残余油饱和度下的毛管压力有关,二者相差越大,过渡带厚度越大;构造-岩性油藏产纯油带、油水过渡带的分布并非平行于构造等高线,油水分布除受构造位置控制外,还受由沉积作用所引起的岩性、物性和孔隙结构差异的影响。Taking the fault-bounded block Hua 17 in the North Jiangsu basin as an example, this paper analyzed the oil and gas distribution rules and controlling factors on the basis of quantitative description of oil/water interfaces and thickness of oil/water transition zones in combination with dynamic features of production of oil wells. The results show that the oil/water interface in the reservoir is an undulating curved face, and its height above the free water surface increases with the growth of capillary pressure. The thickness of the oil/water transition zone is only controlled by capillary pressure when the saturation is equal to interstitial oil saturation and bound water saturation. Furthermore, the greater the differences are, the thicker the oil/water transition zone. Oil/water microscopic distribution of a structural lithologic reservoir is controlled by not only structural location, but also differences of lithologic character, physical property, and pore structure resulted from sedimentary process. The equations of oil/water interface and oil/water transition zone with parameters of pore structure are established in this paper. And they are tested by the actual data of the Hual7 fault-bounded block in the North Jiangsu basin. The result proves that this method is effective in geometric arrangement of wells for oil field production.

关 键 词：油水接触面 油水过渡带 孔隙结构 构造-岩性油藏 苏北盆地 

分 类 号：TE311[石油与天然气工程—油气田开发工程] P584[天文地球—岩石学]