ANALYSIS ON THE FORMATION AND ENRICHMENT CONTROL MECHANISM OF THE LOWER JURASSIC RESERVOIRS BY PALEO-GEOMORPHOLOGY OF WUQI AREA IN THE ORDOS BASIN
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摘要: 为了研究吴起地区侏罗系古地貌油藏成藏主控因素，采用沉积学古地貌恢复法，依据富县组+延10地层砂体厚度刻画吴起地区侏罗系古水系分布，结合鄂尔多斯盆地前侏罗纪古地质特征，对吴起地区古地貌特征及侏罗系下部油藏成藏和富集规律进行了研究，在此基础上总结了油气成藏模式。研究表明：吴起地区发育下切河谷、斜坡带和河间丘三种古地形。前侏罗纪古地形控制着侏罗纪早期地层的沉积和油藏的分布，富县组地层与延长组之间的角度不整合剥蚀面和侵蚀河谷厚层高渗砂体是石油运移的主要通道，同时高渗砂体也是侏罗系下部油藏的主要储集体。依据侏罗系下部油藏的空间分布，结合古地貌、沉积环境、微构造特征等多方面因素总结出吴起地区侏罗系古地貌油藏的3种成藏模式：斜坡式、河间丘式和古河式，其中河间丘式油藏最为发育。Abstract: In order to study the main controlling factors of the accumulation of Jurassic paleogeomorphic reservoir in Wuqi area, sedimentological paleogeomorphic restoration method was mainly used to describe the distribution of Jurassic paleodrainage system in Wuqi area according to the sand body thickness of the Fuxian Formation + Yan 10 Formation. Combined with the pre-Jurassic paleogeological characteristics of the Ordos Basin, the paleogeomorphic characteristics of the Wuqi area and the accumulation and enrichment of lower Jurassic were studied, and the hydrocarbon accumulation model was summarized. The results shows that there are three ancient terrains in Wuqi area:incised valley, slope zone and mound. The pre-Jurassic paleotopography controls the deposition of the early Jurassic strata and the distribution of oil reservoirs. The main channels for oil migration are the angle unconformity and the erosion between the Fuxian Formation and the Yanchang Formation and the thick high-permeable sand bodies in valley. At the same time, the high-permeable sand bodies also the main reservoirs of the lower Jurassic oil reservoirs. According to the spatial distribution of the lower Jurassic reservoirs, combined with various factors such as paleogeomorphology, sedimentary environment and micro-structural characteristics, three types of hydrocarbon accumulation models of Jurassic paleogeomorphology reservoirs in Wuqi area are summarized:slope model, mound model and paleo-valley model, of which mound model reservoirs are the most developed.
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Key words:
- accumulation model /
- paleogeomorphic features /
- Jurassic /
- the Ordos Basin
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图 2 吴起地区新421井-塞517井砂体对比剖面图
Figure 2. Correlation of the sand bodies from Well Xin 421 to Well Sai 517 in Wuqi area
图 3 吴起地区延10顶构造与油藏叠合图
Figure 3. Superposition diagram of Yan10 top structure and reservoir in Wuqi area
图 4 吴起地区吴145井-新177井连井剖面
Figure 4. Correlation profile from Well Wu 145 to Well Xin 177 in Wuqi area
表 1 鄂尔多斯盆地上三叠统-中侏罗统地层划分简表(据文献[12~15]整理)
Table 1. A summary of the Upper Triassic-Middle Jurassic stratigraphic division in the Ordos Basin(collecting from references [12~15])
地层系统 地层厚度/m 沉积体系 岩性特征 统 组 油层组 中侏罗统 直罗组 上部灰绿、深灰色泥岩与灰白色中砂岩互层；下部灰色泥岩与灰白、灰色泥质砂岩，中细砂层呈不等厚互层 延安组 延3—延1 0~280 粉砂岩、泥质粉砂岩、煤层和煤线，常见较丰富的植物根化石和植物叶化石 延4+5 250~300 网状河-残余湖泊 下部主要发育灰白色细砂岩、灰黑色粉砂质泥岩、泥岩互层；上部主要发育灰黑色泥岩、炭质泥岩夹灰白色粉砂岩 延6 河湖-三角洲 下部发育灰白色细粒长石砂岩或岩屑砂岩；上部发育泥岩、炭质泥岩、粉砂质泥岩 延7 延8 灰黑色泥岩与灰白色细粒砂岩，夹煤层，含油层系 延9 灰黑色泥岩与灰白色细粒砂岩，夹煤层、炭质泥岩，含油层系 延10 0~250 冲积扇-河流 中-粗砂岩、细砂岩以及泥质岩和粉砂岩，含油层系 下侏罗统 富县组 灰黑色、紫红色及杂色的泥岩，中粗粒砂岩、细砾岩 上三叠统 延长组 长10—长1 800~1400 湖泊-三角洲 上部为泥岩夹粉细砂岩、碳质页岩及煤层；中部以厚层块状砂岩为主，夹砂质泥岩、炭质页岩；下部为长石砂岩、暗色泥岩夹灰色粉细砂岩，含油层系 
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表 2 吴起地区侏罗系古河划分
Table 2. Division of the Jurassic ancient river in Wuqi area
位置 级别 流向 宽度 富县+延10砂厚 侵蚀层位 蒙陕古河 二级 西北-东南 约5.5~12 km 80~190 m 长2 苏203井→新214井 三级 东北-西南 约1~3 km 80~100 m 长1 塞46井→莲98井 三级 东北-西南 约4~6.5 km 80~100 m 长1 新182井→新121井 三级 自东向西 约1~7 km 80~100 m 长1
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