| 刘畅,刘性全,彭承文,刘芳.松辽盆地三肇凹陷北部姚二+三段滩坝砂体沉积模式[J].矿产勘查,2022,13(12):1761-1768 |
| 松辽盆地三肇凹陷北部姚二+三段滩坝砂体沉积模式 |
| Sedimentary model of shoal bar sand bodies in Yao 2+3 members, northern Sanzhao Sag, Songliao Basin |
| 投稿时间：2021-11-10 |
| DOI：10.20008/j.kckc.202212003 |
| 中文关键词: 滩坝 沉积特征 沉积模式 姚二+三段 油气意义 松辽盆地 |
| 英文关键词: beach dam sedimentary characteristics sedimentary model Yao 2nd+3rd member significance of oil and gas Songliao Basin |
| 基金项目:本文受中国石油科技创新基金(2020D-5007-0102)和国家自然科学基金项目(42172161)联合资助。 |
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| 中文摘要: |
| 利用岩心、测井和地震等资料,对松辽盆地三肇凹陷北部姚二+三段滩坝砂体的地层格架、沉积特征和沉积模式进行了研究。结果表明:采用顶部岩性突变面和底部稳定薄层滩砂下的泥岩为层序界面,将滩坝砂体垂向上划分为两个小层,其中上部1号小层主要发育坝砂,下部2号小层主要发育滩砂；坝砂具有反粒序、砂泥稳定互层、单砂层厚、水动力强等特征,而滩砂具有尖峰状、砂泥频繁互层、单砂层薄、水动力弱等特征；物源供给强度、水动力条件的强弱和古地貌的坡度是影响滩坝砂体形成和分布的主要控制因素,最终建立了三肇凹陷北部姚二+三段湖侵早期的滩坝沉积模式,指出坝砂主体发育区为有利勘探目标。 |
| 英文摘要: |
| Based on core, well logging and seismic data, the stratigraphic framework, sedimentary characteristics and sedimentary model of beach bar sand body in Yao 2dn+3rd members, northern Sanzhao Sag, Songliao Basin were studied. The results show that the beach bar sand body can be vertically divided into two small beds, the first small bed is mainly developed in the upper part, and the second small bed is mainly developed in the lower part. The bar sand has reverse grain order, stable interbedded sand, thick single sand layer and strong hydrodynamic force, while the beach sand has peak shape, frequent interbedded sand, thin single sand layer and weak hydrodynamic force. The intensity of provenance supply, the strength of hydrodynamic conditions and the slope of paleogeomorphology are the main controlling factors affecting the formation and distribution of beach bar sand body. Finally, the beach bar sedimentary model of the early lacustrine invasion in the shallow water depression lake basin of the 2nd+3rd members of Yao formation in the northern Sanzhao Sag is established, and the main development area of the bar sand body is a favorable exploration target. |
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