摘要
Abstract
Based on the short-term base-level cycle theory of high resolution sequence stratigraphy and the data of drill core and well loggings, the paper analyses the reservoir sandstones deposited on the braided stream delta front with the 2nd member of Hetaoyuan Formation in the Xia'ermen Oilfield. On the basis of genetic, the reservoir sandstones are divided into three types of short-term base-level cycle: up-deepening non-symmetric type (mode A), up-shallowening non-symmetric type (mode B) and symmetric type (mode C)that consist of seven subtypes. According to short-term base-level cycles and overlay modes, seven subtypes of sandstones are identified: underwater distributary channels sandstone, integrated underwater distributary channels, superposition river mouth bar, river mouth bar and distal bar combination, underwater distributary channels at the bottom and mouse bars at the top, mouse bars at the bottom and underwater distributary channels at the top. The study shows that the short-term base-level up and down changes and ratio of accompanied accommodation and sediment alimentations(A/S) influence the distribution of different reservoirs sandstone bodies. Therefore, a distribution model is built for different genetic sandstones deposited in different localities of the braided stream delta front.关键词
短期基准面旋回/砂体成因分析/三角洲前缘/下二门油田Key words
short-term base-level cycle/genetic analysis of sandstone/delta front,Xia'ermen Oilfield分类
天文与地球科学
