鄂尔多斯盆地上三叠统延长组沉积中心迁移特征及其对成藏的作压  

Characteristics of Migration of Ordos Basin＇s Upper Triassic Yanchang Formation Sedimentary Center and Its Effect on Hydrocarbon Accumulation to Form Reservoirs

作　　者：李元昊[1,2] 王秀娟 

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

出　　处：《低渗透油气田》2010年第3期7-13,35,共8页

摘　　要：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、储层和盖层的空问分布和成藏组合方式。进而控制了油藏分布规律．．为鄂尔多斯盆地上三叠统延长纽在不同区域、不同层位形成不同成藏组合特征的大油田奠定了基础。最终建立了研究区陕北烃源岩向上排烃聚集、陇东向下排烃聚集、西北既向上又向下排聚集的3种成藏模式。migration of the deposition center is mainly affected by tectonics in the early period of deposition of llle Upper Triassic Yanehang Formation （Changl0-ChangT） in Ordos Basin, with counterclockwise migration features. In the mid-late period of the deposition （Chang6-Changl）, the center＇s migration is mainly controlled by the source rock, with the seesaw migration characteristics. Deposition center migralion controls the spatial distribution and accumulation combination mode of the source rock, reservoir and eaprock, and controls the distribution of the reservoir, laying a basis for the Ordos Basin Upper Triassic Yanehang Formation to form large oilfields with varied characleristics of aecumulalion combinations in various regions and horizons. Three reservoir-forming patterns was eventually established in the sludy area, that is, upward hydrocarbon expulsion from source roek and gathered in Northern Shaanxi, downward hydroearbon expulsion from source rock and gathered in Eastern Gansu, and both up- and downwant hydroearbon expulsion and gathering in the NW.

关 键 词：鄂尔多斯盆地 延长组 沉积中心迁移 物源 成藏组合 

分 类 号：P618.130.2[天文地球—矿床学]