莫里青油藏位于伊通盆地西南端，盆地的层序发育受构造抬升控制，地层长期继承发育，具有生成石油和天然气的良好条件。
本文以Cross的高分辨率层序地层学理论和Vail层序地层学原理为指导，经过大量的区域构造解释和地质分析工作，对莫里青地区构造演化和断裂活动性进行深入分析，明确了莫里青地区双二段沉积相类型。本区双阳组二段沉积相类型主要是湖泊水下扇相和湖泊相。本区水下扇相包括内扇、中扇和外扇三种亚相；本区湖底扇相只有半深湖亚相。
然后对研究区进行了多级次基准面旋回的等时地层对比，建立了莫里青油田双阳组二段高分辨率层序地层对比格架，同时绘制1条平行物源方向的层序地层对比剖面。最后阐述了本区沉积模式，对指导油气的开发和生产具有不可缺少的作用。
关键词：莫里青；双二段；高分辨率层序地层学；界面识别；沉积模式
The MoLiqing reservoir is in the southwest end of the YiTong basin. The sequence development of the basin is controlled by the tectonic uplift. The long-term inheritance and development of the strata have favorable conditions for the generation of oil and gas.
Based on Cross High-Resolution Sequence Stratigraphy Theory and Vail Sequence Stratigraphy Principle, this paper analyzes the tectonic evolution and fault activity of the MoLiqing area through extensive regional structural interpretation and geological analysis, then clarifies the type of sedimentary facies. The sedimentary facies of the second member of ShuangYang Formation in this area are mainly submarine fan and lacustrine facies, and submarine fan in this area is divided into three subfacies of out fan, middle fan and inner fan, the lacustrine facies only have half deep lake subfacies.
In addition, this paper use the synthetic seismic data for interface tracking, logging information and core data to identify and divide the second member of the ShuangYang Formation in the MoLiqing area, identify two long-term base-level cycle sequences, five medium base-level cycle sequences and twenty short-term base-level cycle sequences. Among them, three methods are used for logging interface identification, which are conventional logging identification, wavelet transform contrast and maximum entropy spectrum analysis.
Then, the high-resolution sequence stratigraphic comparison framework of the second member of the ShuangYang Formation in the MoLiqing reservoir was established by comparing the isotopic stratigraphic comparisons of the multi-stage base-level cycles, In the meantime, draw a sequence stratigraphic contrast profile in the direction of a parallel source. Finally, the sedimentary model of this area is expounded, which is an indispensable role in guiding the development and production of oil and gas.
Key words: MoLiqing reservoir; The second member of the ShuangYang Formation; High Resolution Sequence Stratigraphy; Interface recognition; Sedimentary model
1 绪论
本文旨在研究伊通盆地莫里青地区双阳组双二段高分辨率层序地层。本区双阳组二段沉积相类型主要是湖泊水下扇中扇亚相和湖泊相半深湖亚相[1]。双二段岩性以砂岩和泥质砂岩为主，具有良好的油气成藏条件，是莫里青地区主力含油层位。
根据伊通盆地莫里青区域地质背景，结合沉积地层学，弄清楚莫里青地区的地层发育特征、构造与演化特征。随后分析研究区沉积相类型，这是承上启下的研究内容，经过大量研究给出每一沉积亚相的综合分析图。在以上研究基础上，结合前人的层序划分方案，本文给出了更为细致的层序地层划分方案。运用识别出的层序界面，选取本区具有代表性的生产井，运用该井资料建立本区高分辨率层序地层模型。运用建立的模型来辅助油气勘探，会提高油田探测的精准性，解决许多困难。
基于高分辨率层序地层学和储层沉积学，了解研究区的区域概况，分析地层发育特征，明确本区双二段沉积相类型。根据多种资料划分层系，建立了等时高分辨率地层对比框架，以阐明沉积相的分布特征。依据以上完成的任务，进一步弄清莫里青盆地的高分辨率层序特征，为油气开发提供必要的准备，尤其有利于隐蔽性油气田的开发。同时推进中国油气开发的发展，提高储层的预测性。
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