陆相湖盆沉积中心迁移特征及主控因素——以鄂尔多斯盆地上三叠统延长组为例  

Characteristics of sedimentary center move of terrestrial-facies lake basin and its main controlling factors --Taking the Triassic Yanchang Formation in Ordos Basin as an example

作　　者：李元昊[1,2] 王秀娟 梁艳[1,2] 白嫦娥[1,2] 王亚玲[1,2] 邵晓洲 

机构地区：[1]低渗透油气田勘探开发国家工程实验室,710018 [2]中国石油长庆油田分公司勘探开发研究院 [3]中国石油长庆油田分公司油藏评价处

出　　处：《低渗透油气田》2016年第2期12-17,共6页

摘　　要：陆相湖盆沉积中心迁移主要受构造和沉积物源的控制，前人对构造沉积中心的迁移研究较多，而物源对沉积中心的迁移作用研究相对薄弱，在构造稳定时期物源方向和供屑能力是决定沉积中心位置的主要因素。根据主要入湖河流的多少，沉积物源可分为单源型和双源型，沉积中心主要受供屑能力强、进积快的物源控制，迁移方向与沉积物进积方向一致一同时。河流入湖方向和湖盆长轴方向不同沉积中心迁移特征也不同。鄂尔多斯盆地上三叠统延长组沉积早期（长10-长7）沉积中心迁移主要受构造影响，具有逆时针迁移特征，中晚期（长6-长1）沉积中心迁移主要受物源控制，具有拉锯式迁移特征。沉积中心的迁移控制了烃源岩、储层和盖层的空间分布和成藏组合方式，进而控制了油藏分布规律。The migration of the sedimentary center in the terrestrial-facies lake basin is controlled by the tectonics and source of sediment or deposits. The study on the migration of the sedimentary center is relatively extensive, while the effect of the provenance on the migration of the sedimentary center is relatively weak. The source orientation and the clast supply capacity are the main factors determining the location of the depositional center during the structural stahilization. According to the number of main rivers that flows into the lake, sediment sources can be divided into single-source and dual-souse. The sedimentation center is mainly controlled by the provenance that has a strong clast supply capacity and rapid progradation, and the migration direction is consistent with the direction of the sediment progradation. At the same time, the characteristics of migration of the sedimentary centers whose directions of the rivers entry into the lake are different from the orientation of the long axis of the lake basin are also different. The migration of the sedimentary centers in the early stage of sedimentation of the Yanchang Formation （Chang10- Chang7） of the Upper Triassic in the Ordos Basin is mainly influenced by tectonism, and has the counterclockwise migration characteristics. The migration of the centers in the middle and late stages （Chang6 - Changl ） is mainly controlled by the provenance, with a see-saw migration feature. The migration of the depositional center controls the spatial distribution of the source rock, reservoirs, and caprock, and the SRCA （source-reservoir-caprock assemblage） patterns, and then controls the law of the reservoirs distribution.

关 键 词：鄂尔多斯盆地 延长组 沉积中心迁移 物源 

分 类 号：P618.130.2[天文地球—矿床学]