摘要
针对砂砾岩储层砾石、砂级颗粒和粘土级颗粒混杂堆积的复模态结构导致的复杂孔喉分布,应用恒速压汞技术假设多孔介质由孔径大小不同的孔隙和吼道构成的理论模型优势以区分孔隙和吼道的大小分布,对新疆百口泉油田百口泉组砂砾岩储层进行了直观、定量的测试分析。结果表明:(1)砂砾岩储层孔隙分布多呈单峰态,孔隙半径分布范围为53~559μm,平均214μm,砂砾岩储层喉道分布呈宽缓的多峰态,且主峰值喉道半径偏小(<5μm),喉道半径分布范围为1~29μm,平均为8μm,孔喉比亦表现为多峰态的分布特征,分布范围为5~295,平均46,砂砾岩储层喉道的极强非均质性是导致其储层微观结构复杂的决定性因素;(2)根据压汞曲线形态及不同孔径单元进汞曲线关系将其分为3类并对应研究区3种储层类型。第一类初期孔隙及喉道进汞一致且缓慢上升,后期发生不同程度的上翘,指示了该类储层孔喉比小,连通性好的特征,为较优质的储层。第二类初期表现为喉道进汞曲线大幅升高与孔隙进汞曲线分离,后期缓慢升高的特征,反映了该类储层喉道发育较差,孔隙发育尚可,整体为储集性能较好但渗流性能较差的特征。第三类压汞曲线表现为孔隙及喉道的进汞压力快速大幅升高趋势,指示了孔隙及喉道均不太发育且连通性较差的特征,为较差的储层类型。
Conglomerate reservoir has complex pore and throat distribution which caused by the multi-model structure of gravel,sand-grade particles and clay-grade particles.Rate-controlled porosimetry has the advantage to separate the pore and throat.Taken the Baikouquan formation＇s conglomerate reservoir as an example,combined the advantage of rate-controlled porosimetry,the alterations of pore and throat characteristic parameters were quantitatively and clearly characterized.The study shows as follows.（1） The pore distribution of the conglomerate reservoir is in the form of single peaked,the distribution of the pore radius is 53 - 559 μm,the average is 214 μm.The throat distribution in the form of multimodal and the main throat is small（ 5 μm）,the distribution of the throat radius is 1 - 29 μm,the average is 8 μm.The pore/throat ratio distribution is also in the form of multimodal,the distribution of pore/throat ratio is 5 - 295,the average is 46.The strong heterogeneity of the throat is the decisive factor in the complex microstructure of conglomerate reservoir.（2） According to the form of mercury curve and the relation between total,pore and throat curve,the reservoir in the study area are divided into three categories.The first type of pore and throat curves are consistent and slowly rising at first,and then increased in different level,those indicate that this type reservoir has good quality with small pore/throat ratio and good connective.The initial performance of the second type is that the throat curve is significantly increased and separated with the pore curve,the latter stage slowly raised,those reflect the throats are bad developed and pores are better developed,the storage ability is good,while the permeable ability is bad.The third type of curve shows a rapid increase in pores and throats,indicating that the pores and throats are less developed and have poor connectivity,those indicate that the reservoir has poor quality.
作者
秦国省
邹存友
赵亮
匡明
田雅洁
王忠博
杜潇
QIN Guo-sheng;ZOU Cun-you;ZHAO Liang;KUANG Ming;TIAN Ya-jie;WANG Zhong-bo;DU Xiao(PetroChina Research Institute of Petroleum Exploration ＆ Development,Beijing 100083,China;College of Geosciences,China University of Petroleum（Beijing）,Beijing 102249,China;School of Energy Resources,China University of Geosciences（Beijing）,Beijing 100083,China)
出处
《科学技术与工程》
北大核心
2018年第20期71-78,共8页
Science Technology and Engineering
基金
国家重大科技专项2016ZX05010-005)资助
关键词
恒速压汞
复模态
砂砾岩
百口泉
准噶尔盆地
rate-controlled porosimetry
multi-model
conglomerate reservoir
Baikouquan formation
Junggar basin
