| 东濮凹陷两种新储层类型——沙河街组河口湾体系的识别与储层预测 |
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| 引用本文： | 吴贤涛,林又玲,潘结南.东濮凹陷两种新储层类型——沙河街组河口湾体系的识别与储层预测[J].古地理学报,2000,2(3):52-58. |
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| 作者姓名： | 吴贤涛 林又玲 潘结南 |
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| 作者单位： | 焦作工学院化石燃料研究所 河南焦作 454000 |
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| 基金项目： | “八五”石油天然气总公司重点科技攻关项目，编号 85 - 10 3- 0 3 - 0 1 |
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| 摘 要： | 东濮凹陷沙河街组河口湾环境发育的最初征兆是出现震积岩（Seismites）和水下脱水收缩裂隙（Synaeresis），预示其基底有构造性下沉，海水在间歇性地灌入，接着淡水介形类开始大量死亡。与海水有关的生物痕迹如Ophiomorpha、Tigillites屡屡出现，说明此时此地淡水水体已被河口湾咸水水体所取代，最后剖面中见到滨海高能环境下的生物痕迹Arenicolites和鲕粒砂岩、介壳碎屑层等，指示潮道和潮汐坝的存在。至此，这一地区的河口湾以陆相（分流河道）－陆海混合相（河口湾点坝）－海相（潮道）为代表的三元结构，便完整地记录了一次海面升降周期。由陆相动物活动痕迹、植物活动痕迹和古土壤识别出的陆相部分在沙河街组有10层（开31井），由海相生物痕迹、海相生物及海相内源沉积物识别出的海相部分有12层（开31井、新胡4井），说明沙河街组沉积期曾有过10次以上的海面升降过程。海面下降时，河流沿兰聊断裂和内黄凸起间断裂谷地侵蚀切割两岸形成可容空间；海面上升期，此可容空间部分或全部被不同类型的沉积物所充填，形成了分流河道、河口湾点坝砂为代表的下切谷型储层和以潮道、滩坝砂体为代表的超覆型储层。
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| 关 键 词： | 东濮凹陷 储层 沙河街组 河口湾体系 储层预测 |
| 修稿时间： | 1999年6月9日 |
TWO NEW RESERVOIR TYPES IN DONGPU DEPRESSION——THE RECOGNITION OF ESTUARINE SYSTEM AND RESERVOIR PREDICTION IN TERTIARY SHAHEJIE FORMATION |
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| Wu Xiantao,Lin Youling,Pan Jienan.TWO NEW RESERVOIR TYPES IN DONGPU DEPRESSION——THE RECOGNITION OF ESTUARINE SYSTEM AND RESERVOIR PREDICTION IN TERTIARY SHAHEJIE FORMATION[J].Journal of Palaeogeography,2000,2(3):52-58. |
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| Authors: | Wu Xiantao Lin Youling Pan Jienan |
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| Institution: | Fossil Fuel Institute Jiaozuo College of Technology Henan Jiaozuo454000 |
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| Abstract: | The initial indication of the Shahejie Formation estuarine environment of the Dongpu Depression was the deposition of seismites and the formation of the marine water related sedimentary structures such as synaeresis. These evidences suggest that the Dongpu Depression has experienced tectonic subsidence and occasional incursion of marine water during the Tertiary.At the beginning of the middle part of the division 4 in the Shahejie Formation, another important event took place; that is, a mass death of fresh water Ostracodes. At the same time, marine trace fossils such as Ophiomorpha and Tigillites started to occur. This substitution suggests that fresh water of the ephemeral lake was replaced by saline water of the estuarine at that time. In the late sedimentary period of the middle part of the division 4 of the Shahejie Formation, coastal high energy environments, such as tidal channels and tidal sand bars, were developed, forming oolitic sandstones, shelly sandstones and trace fossils Arenicloites. Over this period, three environmental units, including distributary channel (terrestrial portion), estuarine point bar (mixed energy portion), tidal channel and tidal bar (marine portion), have been developed in the section and the combination of these environments have recorded periodical sea level changes.There are 10 beds containing fresh water trace fossils, plant traces or paleosols (in Kai well 31), and 12 beds containing marine trace fossils or body fossils as well as marine sediments (Kai well 31, New Hu well 4) in sections of the Shahejie Formation. These facts imply that more than ten periods of sea level changes occurred during deposition of the Shahejie Formation.There are some evidences showing that the fluvial channel might have incised into the banks along palaeovalley between the Lanliao Fault and the Neihuan uplift and have produced an incised valley during sea level fall. During the early period of sea level rise, the accommodation space in the incised valley has been fully or partially filled with sandstones of distributary channel, fluvial point bar and estuarine point bar environments, which constitute the incised valley reservoir type in the Dongpu Depression. During the middle period of sea level rise the tidal channel and tidal bar sandstones have developed in this area, which constitute the shelf onlap reservoir type |
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| Keywords: | Dongpu Depression Shahejie Formation estuarine system incised valley reservoir prediction |
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