西安科技大学学报2012，Vol.32Issue(4)：470-475,484,7.
安塞油田晚三叠世长7油层组沉积微相及储层非均质性研究
Sedimentary microfacies and heterogeneity of Chang7 formation in Late Triassic of Ansai Oilfield
摘要
Abstract
Based on studying the geological background of shallow water front delta, the sedimentary characteristic, development regularity and heterogeneity of reservoir, the shallow water front delta sedimentary system, the development regularity and heterogeneity of reservoir from Chang 7 oil-bearing interval of the Lower Triassic Yanchang formation in Ansai Oilfield were analyzed. The result shows that shallow water front delta sedimentary system was developed, and subdivided into 4 microfacies; subaqueous distributary channel,subaqueous interdistributary bay,mouth bar,and sheet sand,in which subaqueous distributary channel and subaqueous interdistributary bay are the main microfacies. The Chang7 formation is mainly composed of arkoses and lithic arkoses. The fillings content mainly includes chlorite membrane , kaolinite, ferrous calcite, filamentous illite cementation, in which the ferrocalcite cementation is highest. By the analysis of inlayer heterogeneity, interlayer heterogeneity and planar heterogeneity, there is strong reservoir heterogeneity of Chang7 oil-bearing interval of Ansai Oilfield. The high porosity and permeability are controled by the sand body schistose and point-like, or irregular distribution, the value of main sandbodies in microfacies is high, with the thickness of margin and bottom of sandbodies diminished, the porosity and permeability decrease.关键词
安塞油田/浅水型三角洲前缘/沉积微相/储层非均质性Key words
Ansai Oilfield/ shallow water front delta/ microfacies/ reservoir heterogeneity分类
能源科技引用本文复制引用
吴志宇,李克永..安塞油田晚三叠世长7油层组沉积微相及储层非均质性研究[J].西安科技大学学报,2012,32(4):470-475,484,7.基金项目
国家重点基础研究发展计划(973计划)项目(2003CB214602) （973计划）
