| 不整合体结构特征研究: 以永1井区侏罗系-白垩系不整合为例 |
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| 引用本文： | 官伟,徐怀民,李涵,程磊,马永辉.不整合体结构特征研究: 以永1井区侏罗系-白垩系不整合为例[J].现代地质,2019,33(2):401-411. |
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| 作者姓名： | 官伟 徐怀民 李涵 程磊 马永辉 |
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| 作者单位： | 中国石油大学(北京) 地球科学学院,北京 102249 |
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| 基金项目： | 国家重大科技专项(2017ZX05001-003-02) |
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| 摘 要： | 永1井区位于准噶尔盆地腹部昌吉凹陷,中晚侏罗世受燕山运动的影响在盆地腹部形成车莫隆起带,使得下伏西山窑组地层受到超覆、削蚀,形成了一系列岩性、地层及复合油气藏。在油气运聚成藏过程中不整合体的结构发挥了重要作用,故对不整合结构进行了三级层次划分:一级为盖层和不整合体层;二级将不整合体层分为上覆层、不整合层及下伏层;三级是成藏要素级,包括运聚层、隔挡层、风化黏土层和风化淋滤带。借助测井资料,运用岩性、物性、岩石学特征等分析不整合体纵向结构,研究区不整合体三级结构发育完整。地震资料结合测井资料,通过自然伽马反演明确不整合体结构层中运聚层和隔挡层的展布。风化淋滤带厚度自高部位向凹陷方向逐渐减薄,风化黏土层反之,二者具有较好的负相关性。不整合体的结构控制了本区最重要的两类储盖组合,分别是不整合体上覆层-不整合体盖层的储盖组合及不整合体下伏层-风化黏土层的储盖组合。
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| 关 键 词： | 不整合体 结构特征 储盖组合 永1井区 |
| 收稿时间： | 2018-02-17 |
| 修稿时间： | 2018-03-20 |
Structural Features of Unconformities: A Case Study of the Jurassic-Cretaceous Unconformity in Well Yong 1 Area,Junggar Basin |
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| GUAN Wei,XU Huaimin,LI Han,CHENG Lei,MA Yonghui.Structural Features of Unconformities: A Case Study of the Jurassic-Cretaceous Unconformity in Well Yong 1 Area,Junggar Basin[J].Geoscience——Journal of Graduate School,China University of Geosciences,2019,33(2):401-411. |
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| Authors: | GUAN Wei XU Huaimin LI Han CHENG Lei MA Yonghui |
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| Institution: | College of Geosciences,China University of Petroleum,Beijing 102249,China |
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| Abstract: | Well Yong 1 area is located in the Changji Sag of the Junggar Basin. Yanshan Movement had formed the Chemo uplift in the mid-late Jurassic, and it also led to overlapping and erosion of the Xishanyao Formation, forming a series of stratigraphic and lithologic reservoirs. Unconformity structures play an important role in the hydrocarbon migration and accumulation processes. Considering the factors of accumulation, the unconformity structures are divided into three levels: Level I includes cover and unconformity body, Level II divides the unconformity body into overlying strata, unconformity layer and underlying strata, and Level III contains the reservoir-forming elements, including the reservoir, barrier layer, weathered claystone and weathered leaching zone. The vertical unconformity structures are divided by logging data based on lithology, physical properties and petrological characteristics, and these structures in the study area are relatively complete. Through natural gamma ray inversion (based on seismic and well-logging data), the distribution of reservoirs and barriers in the unconformity structural layers are clarified. Thickness of the weathered leaching zone decreases gradually from the upper part to the sag, whereas the weathered claystone thickness increases, yielding a good negative correlation. The unconformity structures control the two most important types of reservoir-cap combinations in this area, i.e. (1) a combination of the overlying strata and the regional cap layer, and (2) a combination of the underlying strata and the weathered claystone. |
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| Keywords: | unconformity body structural feature reservoir cap assemblage Well Yong 1 area |
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