| 渤海湾盆地海域片麻岩潜山风化壳型储层特征及发育模式 |
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| 引用本文： | 王德英,王清斌,刘晓健,赵梦,郝轶伟.渤海湾盆地海域片麻岩潜山风化壳型储层特征及发育模式[J].岩石学报,2019,35(4):1181-1193. |
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| 作者姓名： | 王德英 王清斌 刘晓健 赵梦 郝轶伟 |
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| 作者单位： | 中海石油(中国)有限公司天津分公司, 天津 300459,中海石油(中国)有限公司天津分公司, 天津 300459,中海石油(中国)有限公司天津分公司, 天津 300459,中海石油(中国)有限公司天津分公司, 天津 300459,中海石油(中国)有限公司天津分公司, 天津 300459 |
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| 基金项目： | 本文受国家"十三五"科技重大专项（2016ZX05024-002、2016ZX05024-003）资助. |
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| 摘 要： | 渤海湾盆地海域太古代-古元古代片麻岩潜山分布面积巨大,已发现多个油气田,有重要勘探价值。本文综合应用岩心、铸体薄片、X衍射、扫描电镜、常规物性、锆石测年、矿物溶蚀模拟等实验手段及统计分析方法落实了渤海片麻岩风化壳型储层地质特征、成因机理及发育模式。研究表明,片麻岩中长英质矿物含量大于70%有利于形成潜山裂缝型优质储层;大气水风化淋滤作用对长石类矿物的溶蚀,形成大量次生孔隙和沿裂缝的溶蚀扩大孔隙,极大改善了片麻岩潜山的储层物性;构造作用产生的断裂和节理不仅可以直接提供储集空间,还可以作为渗流通道加大风化淋滤作用的影响深度和范围,促进深部岩石的溶蚀改造,加速风化过程。上述主控因素指导下建立自上往下发育粘土带、砂化带、砂化砾石带、裂缝带和基岩带的片麻岩风化壳型潜山储层发育模式。
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| 关 键 词： | 储层 发育模式 片麻岩 风化壳 潜山 渤海湾盆地海域 |
| 收稿时间： | 2018/8/10 0:00:00 |
| 修稿时间： | 2019/1/30 0:00:00 |
Characteristics and developing patterns of gneiss buried hill weathering crust reservoir in the sea area of the Bohai Bay basin |
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| WANG DeYing,WANG QingBin,LIU XiaoJian,ZHAO Meng and HAO YiWei.Characteristics and developing patterns of gneiss buried hill weathering crust reservoir in the sea area of the Bohai Bay basin[J].Acta Petrologica Sinica,2019,35(4):1181-1193. |
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| Authors: | WANG DeYing WANG QingBin LIU XiaoJian ZHAO Meng and HAO YiWei |
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| Institution: | Bohai Petroleum Institute of CNOOC(China) Co. Ltd. Tainjin Branch, Tianjin 300459, China,Bohai Petroleum Institute of CNOOC(China) Co. Ltd. Tainjin Branch, Tianjin 300459, China,Bohai Petroleum Institute of CNOOC(China) Co. Ltd. Tainjin Branch, Tianjin 300459, China,Bohai Petroleum Institute of CNOOC(China) Co. Ltd. Tainjin Branch, Tianjin 300459, China and Bohai Petroleum Institute of CNOOC(China) Co. Ltd. Tainjin Branch, Tianjin 300459, China |
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| Abstract: | The Archean-Paleoproterozoic gneiss buried hills are both wide-spread and large-sized in the sea area of the Bohai Bay Basin, which are characterized by regional hydrocarbon accumulation. The buried hills have become an important field of oil and gas exploration and many oil and gas fields have been discovered there. The weathering crust of Archean-Paleoproterozoic gneiss buried hills has been proved to be the most favorable reservoir. In this study, analysis of cores, the cast thin slice, X diffraction, scanning electron microscope, conventional physical property, zircon U-Pb dating and mineral dissolution simulation have been applied to reveal the characteristics of the weathering crust reservoir as well as its genetic mechanism and distribution pattern. The lithology, chronology, reservoir physical property and accumulation space of the buried hills have been discussed. Experiments have been carried out to analyses how the dissolution, mineral type and fractures influenced the properties of the reservoir. The results suggested that the gneiss was formed in Archean-Paleoproterozoic Era and characterized by dissolved pores and fractures due to strong tectonic movements. The high content of felsic minerals (above 70%) was a favorable condition for fractured-buried-hill reservoir. As a result of weathering, the felsic minerals dissolved, forming secondary pores and enlarging the fracture space, which contributed to the reservoir physical property. Fractures and joints not only contributed to accumulation space, but also provided percolation pathway which enhanced the influence of weathering, leading to the expanding of dissolving to greater depth and larger area. Based on these controlling factors mentioned above, we established a reservoir distribution pattern of the weathering crust of the gneiss buried hill including the weathering crust were divided into the clay zone, the sand zone, the sand and gravel zone, the fracture zone and the basement from top to bottom. |
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| Keywords: | Reservoir Developing pattern Gneiss Weathering crust Buried hill Sea area of Bohai Gulf basin |
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