摘要
针对受钻井液污染的基岩地层电阻率及宏观裂缝孔隙度评价难的问题,根据均质储集岩模型和侧向电阻率测井原理,建立了基岩地层体积模型,并导出了系列基岩参数分别与基质参数和宏观裂缝参数之间的关系函数。从基岩储层污染前的2类导电介质到污染后的3类导电介质进行分析,引入了“地层流体替换率”和“钻井液滤液分配系数”,进而建立了基岩地层真电阻率和视电阻率评价方程及宏观裂缝孔隙度解释方程。结果表明,基质孔隙度的变化是影响基岩地层电阻率大幅度变化的本质内因,也是识别基岩储层的重要标志,随着基岩宏观裂缝孔隙度的增大,侧向电阻率逐渐减小。实际岩心分析资料证实,该方法可明显提高基岩宏观裂缝孔隙度的解释精度。研究成果可为基岩储层评价及参数研究提供理论依据。
Aiming at the difficulty to evaluate resistivity and macroscopic fracture porosity of bedrock formation con‑taminated by drilling fluid,a bedrock formation volume model is established according to homogeneous reservoir rock model and principle of lateral resistivity logging,and the functions of the relationship of a series of bedrock parameters vs.matrix parameters and macroscopic fracture parameters is derived.Based on analysis of 2 types of conductive media before contamination of bedrock reservoir and 3 types of conductive media after contamination,“Formation fluid re‑placement rate”and“allocation coefficient of drilling fluid filtrate”are introduced,and then evaluation equations of true resistivity and apparent resistivity of bedrock formation and interpretation method of macroscopic fracture porosity are established.The research shows that matrix porosity change is the essential internal factor that affects significant change of bedrock formation resistivity,and is also an important sign to identify bedrock reservoir.With the increase of bedrock macroscopic fracture porosity,lateral resistivity gradually decreases.Actual core analysis data confirm that this method can significantly increase the interpretation accuracy of macroscopic fracture porosity of bedrock.The research provides theoretical evidence for bedrock reservoir evaluation and parameters study.
作者
康志勇
陈昌
李龙
张杨
KANG Zhiyong;CHEN Chang;LI Long;ZHANG Yang(E&D Research Institute of PetroChina Liaohe Oilfield Company,Panjin 124010,China;LengjiaOilfield Development Company of PetroChina Liaohe Oilfield Company,Panjin 124010,China)
出处
《大庆石油地质与开发》
CAS
北大核心
2023年第4期122-130,共9页
Petroleum Geology & Oilfield Development in Daqing
基金
国家科技重大专项“辽河坳陷增储领域地质评价与勘探实践”(2016ZX05006-005)。
关键词
基岩地层体积模型
侧向电阻率
宏观裂缝孔隙度
储层污染
地层流体替换率
钻井液滤液分配系数
bedrock formation volume model
lateral resistivity
macroscopic fracture porosity
reservoir contami‑nation
formation fluid replacement rate
allocation coefficient of drilling fluid filtrate
