摘要
夹层型页岩油是页岩油勘探开发的重点,如何定量评价页岩油储层中游离态、吸附态烃的赋存状态和含量及其烃类流动性是长7页岩油勘探开发的关键。运用核磁共振与恒速压汞技术手段,结合多粒级分步抽提技术方法,分析陇东地区长7段夹层型页岩油的储层物性、烃类赋存状态及含油性。核磁共振实验结果显示:长7_(1)、长7_(2)、长7_(3)这3个亚段渗透率相差不大,均分布在0.006×10^(-3)μm^(2)左右,其中长7_(2)亚段孔隙度与可动流体饱和度最高,长7_(3)亚段最低,并且可动流体饱和度与孔隙度具有较好的相关关系;在恒速压汞实验中,长7段3个亚段孔隙半径平均大小相差不大(130~150μm),但是长7_(3)亚段喉道半径平均大小(6~8μm)明显优于另外2个亚段(小于0.5μm),整体上长7_(3)亚段孔喉特性优于另外2个亚段;在游离态与吸附态烃评价上,长7_(1)亚段的游离烃含量明显高于长7_(2)亚段,而且长7_(1)亚段具有大面积的连续分布的砂体,所以相对于长7_(2)亚段来说,长7_(1)亚段资源开发更有优势,对于长7_(3)亚段,总抽提量和游离烃绝对含量都最高,如果能够发现大面积连片的砂体,其将也具有一定的开发意义。
At present,interlayer shale oil is the focus of shale oil exploration and development.How to quantita⁃tively evaluate the occurrence and content of free and adsorbed hydrocarbons in shale oil reservoirs and the fluidi⁃ty of hydrocarbons is the key to the exploration and development of Chang 7 shale oil.By means of nuclear mag⁃netic resonance and constant velocity mercury injection,the reservoir properties,hydrocarbon occurrence and oil content of Chang 7 interbedded shale oil in the eastern region of Longdong were analyzed.The results of NMR experiments showed that the permeability of Chang 7_(1),Chang 7_(2) and Chang 7_(3) sub-members was not much different,and they were all distributed in about 0.006×10^(−3)μm^(2).Among them,Chang 7_(2) sub-member had the highest porosity and mobile fluid saturation,while Chang 7_(3) sub-member had the lowest.In the constant velocity mercury injection experiment,the average pore radius size of the three sub-members of Chang 7 was not much different(130-150μm),but the average throat radius size of Chang 7_(3) sub-member(6-8μm)was sig⁃nificantly better than that of the other two sub-members(less than 0.5μm),and the pore throat characteristics of Chang 7_(3) sub-member were better than those of the other two sub-members.In terms of the evaluation of free and adsorbed hydrocarbons,the free hydrocarbon content of Chang 7_(1) sub-member is significantly higher than that of Chang 7 sub-member,and the Chang 7_(1) sub-member has a large area of continuous distribution of sand bodies,so compared with Chang 7_(2) sub-member,Chang 7_(1) sub-member has more advantages in resource devel⁃opment.For Chang 7_(3) sub-member,the total extraction amount and absolute free hydrocarbon content are the highest.If large contiguous sand bodies can be found,it will also have certain development significance.
作者
李家程
王永宏
冯胜斌
淡卫东
陈俊霖
张珊
段有为
崔德艺
李树同
LI Jiacheng;WANG Yonghong;FENG Shengbin;DAN Weidong;CHEN Junlin;ZHANG Shan;DUAN Youwei;CUI Deyi;LI Shutong(Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China;University of Chinese Academy of Sciences,Beijing 100049,China;National Engineering Laboratory for Exploration and Development of Low Permeability Oil&Gas Fields,Xi’an 710018,China;Exploration&Development Research Institute,PetroChina Changqing Oilfield Company,Xi’an 710018,China)
出处
《天然气地球科学》
CAS
CSCD
北大核心
2024年第2期217-229,共13页
Natural Gas Geoscience
基金
国家自然科学基金面上项目(编号:41772142)
甘肃省科技计划项目(编号:22JRSRA045)联合资助。
关键词
鄂尔多斯盆地
页岩油
核磁共振
分步抽提
赋存状态
Ordos Basin
Shale oil
Nuclear magnetic resonance
Stepwise extraction
State of occurrence
