一种不受孔隙度影响的地化热解水淹层评价新方法——以江苏油田Z—L区块应用为例

A new evaluation method of geochemical pyrolysis water flooded layer without affected by porosity——A case study in block Z—L of Jiangsu oilfield

水淹层的识别是油气勘探与开发评价必须解决的基础问题,地化热解录井在这方面具有独特优势。然而,在针对低渗透储层进行评价时,常常因判别结果不正确而带来了经济损失。针对这一实际问题,以江苏油田某区块为例,通过岩心地化热解实验,证明了孔隙度变化对热解参数的影响不可忽略,经理论分析结合实际研究,给出了一个新的地化热解参数"含油气总量减小系数",并验证了含油气总量减小系数可以消除孔隙度对热解参数的影响。同时,建立了Pg、PI参数相结合的新的识别图版,经实际验证应用效果良好。实际指标可直接应用于江苏油田研究区,方法、思路对其他地区也同样具有启示意义。

Water flooded zone identification is a basic problem needed to be solved for exploration activity and development, and geochemical pyrolysis logging has its unique advantages in it, however, in the evaluation of low permeability reservoir, the wrong judgment often brings economic damages. Aiming at this problem, this paper takes a block of Jiangsu oilfield for example, and the result shows that, through core geochemical pyrolysis experiment, the impacts of porosity change on pyrolysis parameters can＇ t be ignored. By theoretical analysis and practical research, a new geochemical pyrolysis parameter of oil and gas volume decrease coefficient was obtained, and the parameter could eliminate the impacts of porosity on pyrolytic parameters, meanwhile, a new identification chart of parameter Pg and PI was established, and practical application verified its application effects. Accordingly, actual values can be directly applied in the study area of Jiangsu oilfield, and its methods and ideas have implications for other areas.