【摘要】 运用基准面旋回原理,通过岩心、录井、测井和地震资料的综合分析,在东濮凹陷文南油田文138井沙二段下亚段中识别出3种基本结构类型和7个亚类型的短期基准面旋回层序。其中,向上"变深"的非对称型主要发育在距物源区较近或物源供给较充分的三角洲前缘中的分流水道、河道间湾沉积区;向上"变浅"的非对称型发育在距物源供给区相对较远但供给量逐渐增多的三角洲前缘中的河口坝、远砂坝沉积区;向上"变深"复"变浅"的对称型往往发育于沉积速率始终小于可容纳空间增长率的三角州前缘区。研究结果表明,文138井沙二段下亚段发育中期基准面旋回(4级)14个,短期旋回(5级)40个,超短期旋回(6级)92个;单个中期基准面旋回的厚度一般为18~32m,单个超短期旋回的厚度平均为4m。更多还原

【Abstract】 Based on the base-level cycles,three types of basic structure and seven subtypes of short-term base-level cyclical sequences were recognized through comprehensive analysis of cores,well-logging and seismic information in the lower part of the second member of Shahejia Formation in Well Wen 138,Dongpu Depression.The up-depthening nonsymmetry types were mainly developed at the distributary channel and inter-distributary bay of delta front with supplies abundant and short distance from source area to sedimentary province.The up-shallowening nonsymmetry types were grown in the river bar and distal sand bar of the delta front with long distance from source area to sedimentary province,and the supplies gradually increased.The up-depthening to up-shallowening symmetry types were produced in the delta front with rate of sedimentation continuously smaller than that of the accommodation space increasing.14 mid-terms,40 short-terms,and 92 supershort-terms base-level cyclical sequences were classified.The thickness of a middle-term base-level cyclical sequences is 18 to 32m,and that of a supershort-term base-level cyclical sequences is 4m.更多还原