摘要
岩心刻度测井是测井解释储层物性参数的重要手段。针对致密砂岩储层的强应力敏感性造成室内常压岩心物性刻度测井出现较大偏差的问题,本文以鄂尔多斯盆地南部延长组长8致密砂岩储层为例,运用岩样覆压孔隙度与渗透率实验手段,分析了物性变化特征,模拟储层覆压作用下孔隙度降低了11.3%,渗透率降低更明显,达到62.6%。建立了覆压物性与常压物性关系的数学模型,实现了根据49个丰富的岩心常压物性样本点计算其覆压物性样本点,在岩心归位的基础上利用声波时差测井参数建立了覆压孔隙度测井解释模型,并基于覆压孔、渗关系建立了渗透率解释模型,模型拟合度分别达到0.93和0.83。实际应用表明,岩心覆压孔、渗与解释模型对比,绝对误差和相对误差仅有0.7%和19.1%,同时准确应用在探井试油解释当中。
Core scale logging is an important means of logging interpretation of reservoir physical parameters.Because of the strong stress sensitivity of tight sandstone reservoirs,large-scale deviations occur in indoor atmospheric rock core physical property logging.Taking Chang-8 tight sandstone reservoir of Yanchang formation in the southern Ordos Basin as an example,this paper analyzed the overburden characteristics of the reservoir by using the experimental results of rock sample porosity and permeability.It is believed that the overburden pressure causes the reservoir porosity and permeability to decrease to varying degrees,and the permeability decrease is more obvious.A mathematical model of the relationship between overburden physical properties and atmospheric physical properties was established,and the results of the overburden physical properties were calculated based on 49 core-pressure physical properties.Also,based on the core homing,the overburden porosity log interpretation model was established by using the acoustic time difference logging parameters,and the permeability interpretation model was established based on the overburden and seepage relationship,model fit reaches 0.93 and 0.83.The practical application shows that the absolute error and relative error of the core overburden,seepage and interpretation model are only 0.7%and 19.1%,and are accurately applied in the exploratory oil test interpretation.
作者
白远
景成
云彦舒
田丰
康胜松
谢旭强
Bai Yuan;Jing Cheng;Yun Yanshu;Tian Feng;Kang Shengsong;Xie Xuqiang(Research Institute of Shaanxi Yanchang Petroleum (Group)Co., Ltd., Xi'an, Shaanxi 710075, China;College of Petroleum Engineering, Xi'an Shiyou University, Xi'an, Shaanxi 710065, China;Yan'an Vocational & Technical College, Yan'an, Shaanxi 716000, China)
出处
《非常规油气》
2020年第3期24-30,共7页
Unconventional Oil & Gas
基金
国家“973”计划“致密油高效开发油藏工程理论与方法研究”(2015CB250905)
陕西省科技统筹创新项目“延长难采储量有效动用开发技术研究”(2016KTCL01-12)联合资助。
关键词
致密砂岩储层
覆压物性
孔隙度
渗透率
测井解释模型
tight sandstone reservoir
overbite pressure property
porosity
permeability
log interpretation model
