辽河西部凹陷古近系扇三角洲前缘沉积特征

发布时间：2018-03-11 13:34

本文选题：辽河西部凹陷　切入点：于楼油层　出处：《西南石油大学学报(自然科学版)》2017年04期 　论文类型：期刊论文

【摘要】：针对研究区砂体成因机制不明确的问题,对辽河西部凹陷A区块于楼油层沉积体系进行了分析。应用丰富的岩芯、测井及粒度等资料,对沉积相特征、平面展布及时空演化过程进行了详细描述。结果表明,研究区发育扇三角洲前缘亚相储层,可进一步划分为水下分流河道、河口砂坝、水下分流河道间砂、水下分流河道间泥及前缘席状砂5种微相。目的油层以水下分流河道沉积为主,呈条带状沿北西—南东向展布,整体上表现为基准面下降的水退旋回。从下至上,y_(24)~1小层表现为基准面上升后又下降的震荡过程,y_(23)~1小层表现为基准面上升的过程,而y_(12)~1小层表现为基准面下降的过程。储层非均质性受沉积展布与沉积演化的影响。通过对研究区沉积体系的精细解剖,为"相控建模"和进一步的剩余油分布研究提供了坚实的地质基础,为开发方式的调整提供了重要依据。
[Abstract]:In view of the unclear genetic mechanism of sand bodies in the study area, the sedimentary system of block A in the western depression of Liaohe is analyzed. The sedimentary facies characteristics are analyzed by using abundant core, well logging and granularity data. The results show that the fan delta front subfacies reservoir is developed in the study area, which can be further divided into subaqueous distributary channel, estuarine bar and interchannel sand. There are 5 kinds of microfacies of interchannel mud and front matte sand in underwater distributary channel. The main reservoir is subaqueous distributary channel sediment, which is distributed in strip form along the NW-SE direction. On the whole, it is shown as a downward cycle of water from the base level. From the bottom to the bottom, the sublayer shows as the oscillation process of the rise of the datum level and then the decrease of the datum level. The sublayer is the process of the rise of the datum level, and the performance of the sub-layer is the rising process of the datum level. However, the sublayer YD _ (12) is a process of base level decreasing. The heterogeneity of reservoir is influenced by the distribution and evolution of sediment. The fine anatomy of sedimentary system in the study area is used to study the reservoir heterogeneity, and the results show that the reservoir heterogeneity is affected by the distribution and evolution of the sedimentary system. It provides a solid geological basis for "phase control modeling" and further research on the distribution of remaining oil, and provides an important basis for the adjustment of development mode.
【作者单位】：中国石油勘探开发研究院;
【分类号】：P618.13

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