复杂断块长井段薄互层储层及流体快速识别

英东油田为复杂断块油气藏,储层井段长,薄互层发育,多套油气水系统纵向上相互叠置,高电阻率水层和低电阻率油气层普遍存在,储层及流体性质快速识别难度大。基于研究区储层特征分析了岩性、物性、孔隙结构等3种影响储层流体性质判别的因素,形成自然电位—井径重叠识别储层、感应与侧向测井电阻率比值重叠识别水层以及气测轻重组分比区分油气层的流体快速直观识别方法。该研究成果提高了英东油田油、气、水评价精度和效率,为高效开发英东油田发挥了重要作用。

Fast Identification Techniques of Reservoir and Fluid Properties in Complex Fault Block with Development of Thin Interbeds

Yingdong Oilfield is a complex fault block reservoir characterized by thick reservoir with development of thin interbeds,moreover there are multiple sets of oil-gas-water systems overlap each other vertically,and high-resistivity water layers and low-resistivity hydrocarbon layers are ubiquitous.So,rapid identification of reservoirs and fluid properties is very difficult. In this paper,difficulties of fluid identification are summarized based on the analysis of lithology, physical properties and pore structure of the reservoirs in the study area.More importantly, three models are built for reservoir and fluid identification:the caliper-potential overlap method for identifying reservoirs;the resistivity ratio method for identifying water layer;and the hydrocarbon components ratio method for distinguishing oil and gas.This research greatly improves the precision and efficiency of evaluating oil,gas and w ater layers in Yingdong oilfield, and has played an important role in the development of Yingdong oilfield.