ISSN 1673-8217 CN 41-1388/TE
主管:中国石油化工集团有限公司 主办:中国石油化工股份有限公司河南油田分公司
潘星, 黄成刚, 景茜, 张世铭, 李智勇, 米海杰. 2015: 柴达木盆地鄂博梁Ⅲ号地区N_2~1储层特征. 石油地质与工程, 29(02): 64-67+147-148.
引用本文: 潘星, 黄成刚, 景茜, 张世铭, 李智勇, 米海杰. 2015: 柴达木盆地鄂博梁Ⅲ号地区N_2~1储层特征. 石油地质与工程, 29(02): 64-67+147-148.
Pan Xing, . 2015: N21 reservoir characteristics of Erboliang-Ⅲ region in Qaidam basin. Petroleum Geology and Engineering, 29(02): 64-67+147-148.
Citation: Pan Xing, . 2015: N21 reservoir characteristics of Erboliang-Ⅲ region in Qaidam basin. Petroleum Geology and Engineering, 29(02): 64-67+147-148.

柴达木盆地鄂博梁Ⅲ号地区N_2~1储层特征

N21 reservoir characteristics of Erboliang-Ⅲ region in Qaidam basin

  • 摘要: 柴达木盆地鄂博梁Ⅲ号地区主要目的层N21为滨浅湖相沉积,粒度较细,以泥质粉砂岩、粉砂岩以及细砂岩为主;通过岩石薄片偏光显微镜观察、常规物性测试、毛管压力分析等一系列微观储层地质实验研究,并结合岩心观察、宏观沉积相展布研究可以得出:储层的平均孔隙度10%左右,渗透率(0.1~10)×10-3μm2,为"低孔-特低渗"型储层,岩石孔喉半径较小,但连通性较好;储层质量主要受控于沉积环境和成岩作用两大因素。滨浅湖沉积和远距离搬运致使岩石主要由细粒沉积物组成,在湖泊作用的不断筛选和分异下岩石的碎屑颗粒分选、磨圆普遍较好,较多的刚性颗粒组成和早期的碳酸盐胶结作用在一定程度上增加了岩石的抗压实能力。

     

    Abstract: N21 reservoir is the main target layer of Erboliang-III region in Qaidam basin,and it belongs to shore and shallow lacustrine facies, with characteristics of fine grain sizes mainly of argillaceous siltstone,siltstone and fine sandstone,the deepest buried depth is up to 4000 m,while the intergranular pore preservation is good.The research on microscopic characteristics and controlling factors of the reservoirs plays a crucial role in expanding exploration to deep formations.Through a series of microscopic reservoir geological study,such as rock slice polarizing microscope observation,conventional physical properties test,and capillary pressure analysis,combined with core observation,macro distribution of sedimentary facies study,it can be concluded that the average porosity of reservoir is about 10%,permeability is mainly about(0.1 ~ 10)×10-3μm2,being of extra low permeability reservoir.The rock pore throat radius is small,but with good connectivity.The quality of the reservoirs is mainly controlled by two factors,the sedimentary environment and the diagenesis.Because of shore and shallow lacustrine sedimentary and remote transportation,the rock is mainly composed of fine grained sediments.Under continuous screening and segregation of the lacustrine effect,the clastic particles separation and granding are generally good.More rigid particles and early carbonate cementation can increase the rock compaction resistance in a certain extent.

     

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