摘要
乌尔逊凹陷大磨拐河组下部(大二段至大三段)发育着近岸水下扇沉积、扇体由扇报、扇中和扇端组成,其沉积怍用类型为高密度至低密度浊流和碎屑流沉积,可进一步划分为七种不同内部结构的岩相类型。近岸水下扇储层经历了复杂的成岩历史,近源相主要受大气水埋藏成岩作用的影响,而远源相则主要受正常的埋藏成岩作用的影响。此外,片钠铝石的形成与深部岩浆活动有关,由于近岸水下扇不同的沉积类型具有不同的成岩历史和成岩机制,因而其孔隙类型和孔隙结构亦有明显差异。
Nearshore subaqueous fans develop in the lower Damoguaihe formation, consisting of innerfan, midfan, and outerfan association. Seven lithofacies and layer divisions have been identified and interpreted as to be high-and low-density terbidites and debrites. Nearshore Subaqueous fans have under gone a complicated diagenetic history. The diagenesis of Proximal fans is af- fected by meteoric burial, but the distal, faeies is mainly controlled by normal burial. The formation of dawsonites is a diagenetic event, relating to deep magmatic movement. Difference in the microfacies of nearshore subaqueous fans exhibits difference in pore types and pore geometries due to their diage- netic histories and mechanisms.
出处
《石油学报》
EI
CAS
CSCD
北大核心
1991年第3期25-35,T001,2,共13页
Acta Petrolei Sinica
