| 扇三角洲砂体几何形态沉积数值模拟方法研究 |
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| 引用本文： | 陈 戈,斯春松,张惠良,等.扇三角洲砂体几何形态沉积数值模拟方法研究[J].地质学刊,2013,37(2):178-182. |
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| 作者姓名： | 陈 戈 斯春松 张惠良 等 |
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| 作者单位： | 1. 中国石油杭州地质研究院,浙江杭州,310023
2. 塔里木油田公司勘探开发研究院,新疆库尔勒,841000 |
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| 基金项目： | 国家科技重大专项“大型油气田及煤层气开发”(2008ZX05004-002)资助 |
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| 摘 要： | 扇三角洲是陆相碎屑岩重要的沉积类型之一.利用砂体沉积过程数值模拟方法可以预测扇三角洲砂体的几何形态.在利用泥沙冲淤动力学模式建立扇三角洲沉积过程的数学方程后,根据现代三角洲沉积特征,设计了其沉积过程的模拟条件,计算域长100 km、宽50 km,流量按50年一遇洪水设计,模拟过程到2 000年时,扇三角洲沉积过程基本达到平衡状态,此时前缘复合砂体最大厚度约39 m.通过对扇三角洲前缘砂体几何形态的模拟研究,总结出扇三角洲沉积体储层建筑结构的模拟与预测方法.计算过程中可识别出4种沉积砂体,包括水下分流河道(砂体的平均长宽比为2.68,平均宽厚比为79.8)、河口砂坝(平均长宽比为2.02,平均宽厚比为68.2)、远砂坝(平均长宽比为1.65,平均宽厚比为58.3)、水下溢岸沉积.主要沉积单元砂体几何参数之间的相关关系较好.实验结果表明,利用泥沙冲淤动力模式可以较好地揭示扇三角洲发育过程,进而可以预测扇三角洲砂体的几何形态.
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| 关 键 词： | 数值模拟 扇三角洲 几何形态 砂体预测 |
| 收稿时间： | 2012/6/11 0:00:00 |
| 修稿时间： | 2013/3/28 0:00:00 |
Study on sedimentary numerical simulation method of fan delta sand body |
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| CHENG Ge.Study on sedimentary numerical simulation method of fan delta sand body[J].Jiangsu Geology,2013,37(2):178-182. |
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| Authors: | CHENG Ge |
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| Abstract: | Fan delta was one of the important sediment types for continental clastic rocks. The fan delta sand body geometrical shape could be forecasted by using numerical simulation method of dynamic model of sediment transport. After mathematic equations of fan delta sand body deposition process were established, simulation conditions were designed for fan delta sedimentation process based on deposition characteristics of modern delta. The length and width of the calculation field were 20 km and 10 km. The flow rate was designed as the most serious flood in 50 years. When simulation process carried through the year 2000, fan delta sedimentation process reached stabilization state with the largest sand thickness of 39 m, medium sand was the main sediment. By fan delta lithology simulation study, a set of technology about reservoir structure simulation and prediction of fan delta was established. Four sediment units could be identified: underwater distributary channel with an average length-width ratio of 2.68 and average width-thickness ratio of 79.8; debouch bar with average length width ratio of 2.02 and average width thickness ratio of 68.2; distal bar with average length width ratio of 1.65 and width thickness ratio of 58.3; underwater overflow sedimentation. The correlativity among the sand body geometry parameters was preferable. The experimental results showed that the dynamic model of sediment transportation could better revealed the fan delta development process by using numerical simulation method, and then could forecast the sand body geometrical shape of the fan-delta. |
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| Keywords: | Numerical simulation Fan delta Geometrical shape Sand body forecast |
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