| 富砂地层格架高分辨率层序地层学研究及储层甜点预测——以四川盆地合川地区须家河组为例 |
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| 引用本文： | 钟原,刘宏,谭秀成,连承波,廖纪佳,刘明洁,胡广,曹剑.富砂地层格架高分辨率层序地层学研究及储层甜点预测——以四川盆地合川地区须家河组为例[J].沉积学报,2016,34(4):758-774. |
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| 作者姓名： | 钟原 刘宏 谭秀成 连承波 廖纪佳 刘明洁 胡广 曹剑 |
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| 作者单位： | 1.油气藏地质及开发工程国家重点实验室(西南石油大学) 成都 610500; |
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| 基金项目： | 国家科技重大专项项目(2016ZX05002006-005)，国家自然科学青年基金(41502147)，National Science and Technology Major Projects |
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| 摘 要： | 富砂致密砂岩储层的甜点预测是领域研究的一个关键和难点，以四川盆地中部合川地区须家河组二段为例，探索从继承性古地貌控制下的高分辨率层序地层学角度来展开研究。基于须二段沉积前雷口坡组岩溶古地貌恢复，认为继承性发展的岩溶古地貌控制了须二期地层的沉积充填，建立了须二段砂体向周缘地貌高地渐次超覆的地层充填模式。以该模式及高分辨率层序地层学理论为指导，综合利用地震、测井、岩芯等资料，在识别不同级别层序界面和湖泛面类型的基础上，将须二段划分为1个长期基准面旋回，又包括6个中期基准面旋回，自下至上为MSC1-MSC6。其中，MSC1-MSC3整体发育退积式辫状河三角洲，向南东超覆，属于上升半旋回；至MSC4达到最大湖泛面之后，随即进入下降半旋回；MSC4-MSC6发育进积式辫状河三角洲，粒度逐渐向上变粗。以基础资料最为丰富的MSC3为例，在层序格架内建立了“古地貌-层序厚度-砂体厚度-砂体物性-甜点分布”的相关关系，预测了有利储层甜点分布区。这些研究思路方法可供富砂致密砂岩储层研究，特别是井网稀疏、地震资料丰富但分辨率有限的地区研究参考，具体认识可直接应用于区域油气勘探部署。
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| 关 键 词： | 致密油气 古地貌 高分辨率层序地层学 基准面旋回 储层甜点 须家河组 合川地区 四川盆地 |
| 收稿时间： | 2016-03-14 |
Using High Resolution Sequence Stratigraphy to Study the Framework of Sand-rich Strata and Predict the Sweet Spots of Reservoir: Taking Xujiahe Formation in Hechuan area,Sichuan Basin as example |
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| Institution: | 1.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation(Southwest Petroleum University), Chengdu 610500, China;2.Department of Earth Science and Technology, Southwest Petroleum University, Chengdu 610500, China;3.Branch of Deposition and accumulation, PetroChina Key Laboratory of Carbonate Reservoir(Southwest Petroleum University), Chengdu 610500, China;4.School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China |
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| Abstract: | The prediction of the sweet spots of sand-rich tight sandstone reservoir has been both important and difficult in the field. This paper, taking the 2nd member of Xujiahe Formation in Hechuan, Central Sichuan Basin as an example, explores this issue by employing high resolution sequence stratigraphy controlled by successive palaeogeomorphology. Based on the recovery of the karst ancient landform of Leikoupo Formation before the 2nd Member of Xujiahe Formation deposition, it is suggested that the sedimentary filling was controlled by successive karst ancient landform, and the formation filling pattern where the sand bodies in the 2nd Member of Xujiahe Formation overlapped highland on the periphery gradually. With the guidance of this pattern and high-resolution sequence stratigraphy, by identifying sequence boundary and flooding surface types in varying degrees and integrating seismic, logging and core data, the 2nd Member of Xujiahe Formation is divided into 1 long-term base-level cycle which includes 6 mid-term base-level cycles, namely MSC1 to MSC 6. Overall, MSC1-MSC3 are characterized by the development of retrogradational braided river delta that overlaps southeastwards and is identified as rising semi-cycle; it switches to descending semi-cycle in the maximum flooding surface in MSC4; MSC4-MSC6 are characterized by the development of progradational braided river delta, with the particle size gradually becoming coarser upwards. Taking MSC3, the most informative cycle, as an example, the correlation between ancient land form, sequence thickness, sand body thickness, sand body physical property and sweet spot distribution is established and the sweet spot distribution areas of favorable reservoirs are predicted. The insights and methods indicated in the paper are of reference value for the study of sand-rich tight sandstone reservoirs, and particularly the study of areas with thinly scattered well network, informative seismic data but limited resolution. Some findings can be directly applied to regional oil & gas exploration and development. |
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| Keywords: | tight oil and gas palaeogeomorphology high resolution sequence stratigraphy base level cycle reservoir sweet spot Xujiahe Formation Hechuan area Sichuan Basin |
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