大庆石油地质与开发2018，Vol.37Issue(2)：26-33,8.DOI:10.19597/J.ISSN.1000-3754.201706056
塔中地区上奥陶统层序格架内礁滩体展布及沉积相
DISTRIBUTION AND SEDIMENTARY FACIES OF THE REEF FLATS IN UPPER ORDOVICIAN SEQUENCE FRAMEWORK OF TAZHONG AREA
摘要
Abstract
In order to make clear of the sedimentary development laws of the reef flat complex in Upper-Ordovician sequence stratigraphic framework in Tazhong area,with the help of the core and slice observations,drilling and logging data analyses,single and commingled well profile anatomy and other technical means,the complex in Lianglitage Formation was figured out.The achievements show that the sedimentary subfacieses controlling the complex development are mainly composed of the biological skeleton reef,plaster （ chalky clay) mound,granular beach and inter-beach sea;the sequence stratigraphic framework can be divided into 3 three-order sequences and 8 four-order sequences,Sequence sq1,sq2 and sq3 mainly consist of the chalky clay mounds,granular beaches and their complexes;the high-energy environment reef flat facies sedimentation is developed generally in Sequence sq4,sq5 and sq6 and moreover takes the reef core as the key form;the inter-beach sea is principally developed in Sequence sq7 and sq8.In the high-frequency sequence framework,the micro geomorphology and high-frequency sea level change cycles control the changes of the accommodation space.The development and migration laws of the reef flat complex are:the short period of the structural stabilization and moderate sea-level rise time are the main growth periods of the reefs,the reef flat mainly developed in the high-order system tract migrate from inner zone to outer zone in its vertical evolution.The progradation of the lately developed reef flat complex is pretty more obvious,and furthermore under the control of the four-order sequence framework the complex migrates from the gentle slope within the platform to the high parts of the platform edges.关键词
塔中地区/上奥陶统/礁滩复合体/层序格架/沉积相Key words
Tazhong area/Upper Ordovician/reef flat complex/sequence framework/sedimentary facies分类
能源科技引用本文复制引用
徐康,刘光祥,胡文瑄,罗开平,陈迎宾,宫晗凝..塔中地区上奥陶统层序格架内礁滩体展布及沉积相[J].大庆石油地质与开发,2018,37(2):26-33,8.基金项目
国家科技重大专项“中西部地区碎屑岩层系油气富集规律与勘探方向”(2016ZX05002-006). （2016ZX05002-006）
