摘要
致密油储层勘探开发过程中,精准地识别成因砂体直接关系到提升有效储层的划分精度,也与压裂层段分级评价和优选相关。利用研究区岩心描述、成像测井和常规测井等资料,在岩心和成像测井刻度常规测井的基础上,分析研究区长7致密油储层不同成因砂体的测井响应特征,并利用能够有效反映沉积特征的自然伽马测井,计算了砂体结构指数和自然伽马减小系数,基于提取的不同成岩相的砂体结构指数和自然伽马减小系数,创建了识别成因砂体的测井识别图版,进而对研究区140多口井长7_2段致密油进行了成因砂体测井单井识别,编制了主力层长7_2的成因砂体平面分布图。研究区长7_2目的层主要发育砂质碎屑流细砂岩相,其次为浊积粉细砂岩相,而滑塌细砂岩相发育较少。该研究结果与生产动态较为吻合,可为致密油储层综合评价和压裂层位分级优化提供一定的参考依据。
During the exploration and development of tight oil reservoirs,the accurate identification of genetic sand bodies will directly affect the division accuracy of effective reservoirs,the classification evaluation and optimization of fracturing intervals.Based on the calibration of cores,imaging logging,this paper analyzes the logging response of different genesis sand bodies of the Chang 7 tight oil reservoir in the study area based on the conventional logging. Then the characteristics of the sand body structure index and the natural gamma reduction factor are calculated using natural gamma logs that can effectively reflect the sedimentary features. Based on the structural index and natural gamma reduction coefficient of sand bodies extracted from different diagenetic facies,a log recognition chart for identifying genetic sand bodies is created.The genetic sand bodies of Chang 72 tight oil reservoir in 140 wells in the study area were identified by this chart,and the plane distribution map of the genetic sand bodies of Chang 72 tight oil reservoir in the main oil producing layers was established.The results show that the 72 members in the study area mainly develops sandy debris flow fine sandstone facies,followed by turbidite fine sandstone facies,while the slippery fine sandstone facies develop less.The research results are in good agreement with the production condition,which can provide a reference for the comprehensive evaluation of tight oil reservoirs and the optimization of fracturing.
作者
石玉江
王长胜
周金昱
刘之的
张鹏
杨珺茹
SHI Yujiang;WANG Changsheng;ZHOU Jinyu;LIU Zhidi;ZHANG Peng;YANG Junru(Changqing Oilfield Exploration and Development Institute,Xi'an,Shaanxi 710021,China;School of Earth Sciences and Engineering,Xi'an Shiyou University,Xi'an,Shaanxi 710065,China)
出处
《测井技术》
CAS
CSCD
2018年第5期530-534,556,共6页
Well Logging Technology
基金
国家"十三五"重大专项鄂尔多斯盆地致密油开发示范工程(2017ZX05069)
关键词
测井解释
致密油储层
成因砂体
西233井区
长7段
log interpretation
tight oil reservoir
genetic sand body
XI 233 well area
Chang 72
