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石油实验地质  2016, Vol. 38 Issue (4): 528-535    DOI: 10.11781/sysydz201604528
致密油气 本期目录 | 过刊浏览 |
鄂尔多斯盆地晚三叠世湖盆中部延长组长7储层致密化因素分析
时保宏1,2, 黄静3, 陈柳4, 杨帆3, 吕剑文3
1. 西安石油大学 地球科学与工程学院, 西安 710065;
2. 陕西省油气成藏地质学重点实验室, 西安 710065;
3. 长庆油田分公司 勘探开发研究院, 西安 710018;
4. 塔里木油田公司 塔中油气开发部, 新疆 库尔勒 841000
Compaction factors of tight reservoirs in the seventh member of Yanchang Formation in the central Ordos Basin during the Late Triassic
Shi Baohong1,2, Huang Jing3, Chen Liu4, Yang Fan3, Lü Jianwen3
1. School of Earth Sciences and Engineering, Xi'an Shiyou University, Xi'an, Shaanxi 710065, China;
2. Key Laboratory of Shaanxi Province for Oil and Gas Accumulation Geology, Xi'an, Shaanxi 710065, China;
3. Petroleum Exploration and Development Research Institute of PetroChina Changqing Oilfield Company, Xi'an, Shaanxi 710021, China;
4. Oil and Gas Development Department of PetroChina Tarim Oilfield Company, Korla, Xinjiang 841000, China
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摘要: 鄂尔多斯盆地晚三叠世湖盆中部长7油层组砂岩孔隙度平均为9%,渗透率为0.1×10-3 μm2,属致密储层范畴。储集体主要为半深湖—深湖相重力流环境下砂质碎屑流砂岩及浊积砂岩,具有粒度细、填隙物含量高、孔喉形态弯曲复杂,分布集中以及次生长石溶孔发育、原生粒间孔较少等特征。运用铸体薄片、X-衍射、包裹体及电子探针等微观测试分析资料,对储层物性影响因素进行分析。分析认为,沉积、成岩及烃类充注是影响储层物性的三大因素,三者相互作用,相互影响。半深湖—深湖相砂岩特有的沉积特征导致储层压实作用强烈,使孔隙减少22%,是储层物性变差的关键因素;长7烃源岩生、排烃过程中生成的有机酸溶蚀长石等易溶物质,产生次生溶孔,对致密储层物性改造有益;烃类大量生成后的偏碱性环境利于晚期含铁碳酸盐等胶结作用进行,是生排烃高峰期后储层变致密的决定性因素。
关键词 成岩作用烃类充注致密储层延长组鄂尔多斯盆地    
Abstract:The Chang7 reservoir (the seventh member of Yanchang Formation) in the Ordos Basin, with an average porosity of 9% and permeability of 0.1× 10-3 μm2, is a tight reservoir. Reservoirs are mainly sandy debris flows and turbidite sandstones in a semi-deep and deep lacustrine gravity flow environment, featured by fine granularity, high filler content, complicated pore and throat shape, enriched secondary dissolved feldspar pores, and poor primary intergranular porosity. The influencing factors for reservoir physical properties were analyzed according to micro test data such as cast thin section, X-ray diffraction, fluid inclusion and electron probe microscopy. Sedimentation, diagenesis and hydrocarbon charging are the three major factors affecting reservoir physical properties. The sedimentary characteristics of semi-deep and deep lacustrine sandstones were key factors that caused intense compaction and cementation in reservoirs. As a result, sandstone porosity may decrease by 22%. On the other hand, feldspars were dissolved by organic acid liquids produced by the reaction of hydrocarbon emplacement, which in turn improved physical property. Alkaline reservoir fluid after hydrocarbon charging was beneficial to the cementation of ferrous calcites, which was critical to reservoir tightening.
Key wordslithogenesis    hydrocarbon charging    tight reservoir    Yanchang Formation    Ordos Basin
收稿日期: 2015-08-17     
ZTFLH:  TE122.2  
基金资助:陕西省自然科学基金(2012JM5010)资助。
作者简介: 时保宏(1970—),男,教授,从事油气成藏地质学及天然气地球化学的研究工作。E-mail:bh.sh@163.com。
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时保宏, 黄静, 陈柳, 杨帆, 吕剑文. 鄂尔多斯盆地晚三叠世湖盆中部延长组长7储层致密化因素分析[J]. 石油实验地质, 2016, 38(4): 528-535.
Shi Baohong, Huang Jing, Chen Liu, Yang Fan, Lü Jianwen. Compaction factors of tight reservoirs in the seventh member of Yanchang Formation in the central Ordos Basin during the Late Triassic. PETROLEUM GEOLOGY & EXPERIMENT, 2016, 38(4): 528-535.

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http://www.sysydz.net/CN/10.11781/sysydz201604528      或      http://www.sysydz.net/CN/Y2016/V38/I4/528

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