| 乌尔逊凹陷沉积成岩体系与油气分布 |
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| 引用本文： | 张吉光,彭苏萍,林景晔.乌尔逊凹陷沉积成岩体系与油气分布[J].古地理学报,2002,4(3):74-82. |
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| 作者姓名： | 张吉光 彭苏萍 林景晔 |
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| 作者单位： | 1. 中国矿业大学(北京校区),北京,100083
2. 大庆油田勘探开发研究院,黑龙江大庆,163453 |
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| 摘 要： | 乌尔逊凹陷地处海拉尔盆地中央，是一个面积较大、勘探程度较高的箕式凹陷。其主要储集层为基岩风化壳、下白垩统的铜钵庙组、南屯组及大磨拐河组。已在其中的两个弧形构造带20余口井获商业油气流。受西缘主断裂控制，该凹陷内形成了4类构造体系，同时也控制形成了西陡东缓的古地形。南屯组、大磨拐河组的各类沉积相以不完整的环带状展布，由此划分出7类构造岩相带，即乌西断阶扇三角洲构造岩相带、乌中深洼湖相构造岩相带，吞－巴中央隆起三角洲构造岩相带、乌东斜坡辫状三角洲构造岩相带、苏仁诺尔弧形断隆近岩水下扇－浊积扇构造岩相带、黄旗庙鼻状隆起扇三角洲构造岩相带、巴彦塔拉弧形断垒冲积扇构造岩相带。分析了南屯组、大磨拐河组的储层特征，并确定5种成岩相，即压实成岩相、碳酸岩交代及胶结成岩相、溶蚀溶解成岩相、自生矿物充填成岩相、硅质沉淀成岩相等。成岩相的差异导致各构造岩相带内的油气藏类型和含油规模的不同。溶蚀溶解成岩相孔渗性最好，苏仁格尔、巴彦塔拉构造岩相带以这种成岩相为主，并已发现一定规模的油气储量。而吞－巴、黄旗庙构造岩相带则是下一步突破的方向。
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| 关 键 词： | 构造岩相带 沉积成岩体系 油气分布 乌尔逊凹陷 油气储量 沉积相 |
| 文章编号： | 1671-1505(2002)03-0074-09 |
| 修稿时间： | 2001年12月20 |
DIAGENETIC SYSTEM OF SEDIMENTATION AND ITS OIL AND GAS DISTRIBUTION IN WUERXUN DEPRESSION |
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| Zhang Jiguang,Peng Suping,Lin Jingye,China University of Mining and Technology.DIAGENETIC SYSTEM OF SEDIMENTATION AND ITS OIL AND GAS DISTRIBUTION IN WUERXUN DEPRESSION[J].Journal of Palaeogeography,2002,4(3):74-82. |
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| Authors: | Zhang Jiguang Peng Suping Lin Jingye China University of Mining and Technology |
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| Abstract: | Wuerxun Depression, a half-graben-like depression with a large area and high exploration level, is located in the central Hailaer Basin. Its main reservoirs include basement weathering crust, and Tongbomiao, Nantun and Damoguaihe Formations of the Lower Cretaceous. The commercial oil and gas were got in more than 20 wells of two arcuate structural belts among the reservoirs. 4 types of structural systems were formed in the Depression due to its western main faults, and the palaeotopograghy with steep west and low-dip east were formed at the same time. Various types of sedimentary facies in the Nantun and Damoguaihe Formations are distributed in form of incomplete cyclic belt. 7 structural lithofacies belts are divided, including fan delta facies on western Wuerxun fault terrace, lacustrine facies in the deep sag of central Wuerxun Depression, delta facies on Tun-Ba uplift, braided delta facies on the slope of eastern Wuerxun Depression, inshore underwater fan-turbidity fan on Surennuoer arcuate faulted uplift, fan delta facies on Huangqimiao nose uplift, and alluvial fan facies on Bayantala arcuate faulted horst. Based on these structural petrofacies, the reservoir properties are further analyzed and 5 main diagenetic facies are determined, including compaction diagenetic facies, carbonate metasomatic/cementing diagenetic facies, corrosion/dissolution diagenetic facies, authigenic mineral filling diagenetic facies, and siliceous precipitation petrofacies. It are pointed out that differences of the diagenetic facies lead to different oil/gas reservoirs and oil-bearing scales in each structural lithofacies belts. The corrosion/dissolution diagenetic facies has the best porosity and permeability, and mainly developped the Surennuoer and Bayantala structural diagenetic facies belts, and a certain oil/gas reserves were discovered. While the Tun-Ba and Huangqimiao structural lithofacies belts are next main exploration targets. |
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| Keywords: | structural petrofacies belts diagenetic system of sedimentation oil and gas distribution Wuerxun Depression |
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