鄂尔多斯盆地太阳湾地区长2特低渗储层评价及有利区预测  

Evaluation and favorable area prediction of Chang 2 reservoir with extra-low permeability in Taiyangwan Region, Ordos Basin

作　　者：谢青[1,2] 王建民[2] 江宽 高雅宁[1] 

机构地区：[1]长安大学地球科学与资源学院,西安710054 [2]西安石油大学地球科学与工程学院,西安710065 [3]中国石油西部管道公司兰州输气分公司,兰州730070

出　　处：《兰州大学学报（自然科学版）》2015年第4期488-495,共8页Journal of Lanzhou University(Natural Sciences)

基　　金：陕西省自然科学基础研究项目(2010JM5003);中国地质调查局地质大调查项目(12120113039900)

摘　　要：针对太阳湾油区长2储层特低渗、强非均质性、剩余油严重的储层特点,为寻找有利勘探区,利用实验、测井、参数分析、标准界定等方法,对研究区长2储层的构造及沉积相发育特征、岩石学特征、物性、孔隙结构特征、成岩作用及其演化特征进行了深入分析,综合评价长2储层特征,预测有利储层发育区块.结果表明:长2储层局部发育微幅度的鼻状构造,属三角洲前缘亚相沉积,岩性主要为长石砂岩,成分和结构成熟度中等-低,以泥质胶结为主,储集空间主要为粒间和粒内溶孔,成岩演化处于晚成岩B期,属于中孔、特低渗储层.在此研究基础上,将长2储层划分成了4类:Ⅰ类为好储层,区内分布少;Ⅱ类为中等储层,主要分布于长22小层中;Ⅲ类为较差储层,在长22和长23小层中分布较广;Ⅳ类为差储层,各小层均有发育.在区内预测了6个有利勘探区.In view of the reservoir characteristics of extra-low permeability, strong heterogeneity and serious con- ditions of remaining oil in Chang 2 reservoir, Taiyangwan oil region, a study was conducted in order to search for favorable exploration areas. Using experiment, logging, parameter analysis and standard demarcation methods, an in- depth analysis was made of the structure and developmental characteristics of sedimentary facies, petrologic features, physical properties, pore structure characteristics, diagenesis and its evolution characteristics in Chang 2 reservoir. A comprehensive evaluation of the characteristics of Chang 2 reservoir was made, and beneficial blocks to the de- velopment of reservoir predicted. The results showed that the nose-shaped micmstrcture developed locally in Chang 2 reservoir and that the study region belongs to delta front subfacies sediment. Its lithology is mainly composed of feldspar sandstone, with medium-low maturity of composition and structure. It mainly includes argillaceous cemen- tation, and reservoir spaces mainly consist of intergranular and intragranular vugular pore spaces. The diagenetic evolution is in B stage of the late diagenetic period, so it belongs to the reservoir with mesopore and extra-low perme- ability. On the basis of this study, Chang 2 reservoir can be divided into four categories of reservoir： Type I is good reservoir, with a little distribution within the region; type II is intermediate reservoir, mainly distributed in Chang 2^2 reservoir; type III is poor reservoir, widely distributed in Chang 2^2 and Chang 2^3 reservoir; type IV is poorer reservoir, developed in all layers. Altogether six favorable exploration areas have been predicted in the region.

关 键 词：特低渗透率 储层评价 有利区 太阳湾地区 鄂尔多斯盆地 

分 类 号：TE311[石油与天然气工程—油气田开发工程]