| 高频基准面旋回控制下浅水三角洲及其砂体发育模式:以松辽盆地扶余油田白垩系泉头组为例* |
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| 引用本文： | 赖洪飞,秦智,王洪君,郑锡,林艳波,鲍志东,李美俊,张云龙,张莉,吴煜潇,宋健,何陵沅.高频基准面旋回控制下浅水三角洲及其砂体发育模式:以松辽盆地扶余油田白垩系泉头组为例*[J].古地理学报,2017,19(4):609-622. |
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| 作者姓名： | 赖洪飞 秦智 王洪君 郑锡 林艳波 鲍志东 李美俊 张云龙 张莉 吴煜潇 宋健 何陵沅 |
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| 作者单位： | 1.中国石油大学(北京)地球科学学院,北京 102249;2.中国石油大学(北京)油气资源与探测国家重点实验室,北京 102249;3.中国石油长庆油田分公司第五采油厂,陕西西安 710200 |
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| 基金项目： | Financially supported by the National Science and Technology Major Project of the 12th Five-Year Plan(No.2011ZX05004-004) |
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| 摘 要： | 浅水三角洲储集层在陆相湖盆油气勘探中具有重要的意义,但基于密井网资料的精细研究仍十分缺乏。以高分辨率层序地层学和沉积学理论为指导,以松辽盆地扶余油田DT91区块白垩系泉头组四段第Ⅲ砂组14余口取心井的岩心资料和700余口密井网测井资料为对象,分析了高频基准面旋回下浅水三角洲及其砂体的发育规律。研究结果表明: (1)浅水三角洲储集层主要发育在河道、漫溢砂、分流砂坝、天然堤、决口扇和席状砂等6种成因砂体,以河道砂体和分流砂坝砂体为主。(2)在岩心和测井曲线上可识别出河道底部冲刷面、进积—退积作用面、退积—进积作用面和湖泛面等4种基准面旋回物理界面;并识别出3大类、7亚类超短期基准面旋回类型。(3)高频基准面旋回演化过程中,湖泊浅水三角洲沉积区可容空间变化不大,沉积物供给通量在可容空间增长速率(accommodation increasing rate,A)和沉积物供给通量(sediment supply rate,S)的比值A/S变化中起着主导作用,进而控制着成因砂体的数量和空间接触关系。当A/S值由小变大时,浅水三角洲的规模快速变小,成因砂体的数量也相应减少;同时,成因砂体垂向接触方式由下切叠加式→加积叠加式→孤立式变化,砂体平面分布的复合连片程度也发生由高到低的变化。
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| 关 键 词： | 基准面旋回 浅水三角洲 成因砂体 发育规律 扶余油田 松辽盆地 |
| 收稿时间： | 08 March 2016 |
Development pattern of shallow-water delta and sandbodies under control of high-frequency base-level cycles: A case study of the Cretaceous Quantou Formation in Fuyu Oilfield,Songliao Basin |
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| Lai Hongfei,Qin Zhi,Wang Hongjun,Zheng Xi,Lin Yangbo,Bao Zhidong,Li Meijun,Zhang Yunlong,Zhang Li,Wu Yuxiao,Song Jian,He Lingyuan.Development pattern of shallow-water delta and sandbodies under control of high-frequency base-level cycles: A case study of the Cretaceous Quantou Formation in Fuyu Oilfield,Songliao Basin[J].Journal of Palaeogeography,2017,19(4):609-622. |
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| Authors: | Lai Hongfei Qin Zhi Wang Hongjun Zheng Xi Lin Yangbo Bao Zhidong Li Meijun Zhang Yunlong Zhang Li Wu Yuxiao Song Jian He Lingyuan |
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| Institution: | 1.College of Geosciences,China University of Petroleum(Beijing),Beijing 102249;2.State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing 102249;3.No.5 Oil Production Plant,PetroChina Changqing Oilfield Company,Xi'an 710200,Shaanxi; |
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| Abstract: | Shallow-water delta reservoirs play an important role in the petroleum exploration of lacustrine basin,but so far,research based on data of dense well block is rare. Guided by high-resolution sequence stratigraphic theory and sedimentology, and based on 14 core well data and 700 well logging data of the 3rd Group of Member 4 of Cretaceous Quantou Formation in DT91 block of Fuyu Oilfield in Songliao basin,this paper analyzed the development regularity of shallow-water delta and sand bodies under control of high-frequency base-level cycle. The result indicated that: (1)Six types of sandbodies including channel sandbodies,overflowed sandboies,distributary bar,natural levee,crevasse splay and sheet sandbodies are widely developed in the shallow-water delta reservoirs,and channel and distributary bar sandbodies are dominant;(2)Four physical interfaces of base-level cycle including channel erosion surface,progradation-retrogradation,retrogradation-progradation interfaces and flood surface can be indentified in drilling cores and well logging data; seven types of super-short-term base-level cycle can be identified. (3)During the evolution of high frequency base level cycle,the accommodation for a shallow water delta showed little variation,while the sediment supply rate played the main role in the variation of A/S(accommodation increasing rate,A;sediment supply rate,S),and thus controlled the variation of quantity and space contact relationship of genetic sandbodies. As the A/S increased,the scale of shallow water delta and the quantity of genetic sandbodies were rapidly decreased;Accordingly,genetic sandbodies stacking pattern changed from downcuting,overlapping to solitary,and the continuous degree of the planar diatribution of sandbodies changed from higher to lower. |
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| Keywords: | base-level cycle shallow-water delta genetic sandbodies development regularity Fuyu Oilfield Songliao Basin |
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