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辽河西部凹陷古近系扇三角洲前缘沉积特征
引用本文:王珏. 辽河西部凹陷古近系扇三角洲前缘沉积特征[J]. 西南石油大学学报(自然科学版), 2017, 39(4): 25-35. DOI: 10.11885/j.issn.16745086.2016.04.01.01
作者姓名:王珏
作者单位:中国石油勘探开发研究院, 北京 海淀 100083
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,y24I小层表现为基准面上升后又下降的震荡过程,y23I小层表现为基准面上升的过程,而y12I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。

关 键 词:辽河西部凹陷  于楼油层  扇三角洲前缘  基准面旋回  储层非均质性  
收稿时间:2016-04-01
修稿时间:2017-06-26

Sedimentary Characterization of Paleogene Period,Fan Delta Front,Liaohe Western Depression
WANG Jue. Sedimentary Characterization of Paleogene Period,Fan Delta Front,Liaohe Western Depression[J]. Journal of Southwest Petroleum University(Seience & Technology Edition), 2017, 39(4): 25-35. DOI: 10.11885/j.issn.16745086.2016.04.01.01
Authors:WANG Jue
Affiliation:Research Institute of Petroleum Exploration & Development, Haidian, Beijing 100083, China
Abstract:The sedimentary system of A reservoir in the Liaohe Western Depression was analyzed to clear up the uncertainty about the formation mechanism of the sand body in the study area. The characteristics of sedimentary facies, plane distribution, and the space-time evolution process are described in detail based on abundant data on the rock core logging and granularity. The results indicate that the fan-delta front subfacies reservoir developed in the study area can be divided into five microfacies, namely, the underwater distributary channel, distributary mouth bar, underwater distributary inter-channel sand, underwater distributary inter-channel mud, and frontal sheet sand. The underwater distributary channel is the main sedimentary microfacies and has a banded distribution in a northwest-southeast direction. This microfacies is affected by the water withdrawal cycle, with the base level descending generally. From bottom to top, the y24I sublayer shows a process of base level rise and fall, the y23I layer shows a process of base level rise, and the y12I layer shows a process of base level fall. The heterogeneity of the reservoir is controlled by the distribution of sediment, as well as evolution. Detailed research results of the sedimentary system provide a solid geological foundation for facies-controlled modeling and further study on the distribution of the remaining oil deposit. This information provides a critical basis for the adjustment of the development method.
Keywords:Liaohe western depression  Yulou oil layer  fan-delta front  base-level cycle  reservoir heterogeneity  
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