| 济阳坳陷富林洼陷中生界复杂岩性风化壳储集层成岩作用* |
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| 引用本文： | 朱世发,贾业,万超凡,马立驰,崔殿,孙超,景安语.济阳坳陷富林洼陷中生界复杂岩性风化壳储集层成岩作用*[J].古地理学报,2020,22(3):555-569. |
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| 作者姓名： | 朱世发 贾业 万超凡 马立驰 崔殿 孙超 景安语 |
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| 作者单位： | 1.中国石油大学(北京)油气资源与探测国家重点实验室,北京 102249;2.中国石油大学(北京)地球科学学院,北京 102249;3.中国石油化工股份有限公司胜利油田分公司勘探开发研究院,山东东营 257015 |
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| 基金项目： | *国家自然科学基金项目(编号: 41872102,41202107)资助 |
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| 摘 要： | 风化壳储集层成因及其差异性特征分析是当今储层地质学研究热点。渤海湾盆地济阳坳陷沾化凹陷富林洼陷中生界油气勘探遇到瓶颈,目前探井仅钻揭白垩系顶部风化壳,且风化壳储集层岩性复杂、非均质性极强,明确风化壳储集层成岩改造、储集空间类型和组合关系,对本区乃至济阳坳陷中生界潜山油气勘探至关重要。通过岩心和薄片观察,结合录井、测井等资料,对富林洼陷白垩系西洼组复杂岩性风化壳储集层开展研究。结果表明: 风化壳岩性主要为安山岩和凝灰岩,其次为脉岩、隐爆角砾岩和砂砾岩。由于不同构造单元在复杂埋藏过程中经历了“洼—隆—隆”或“洼—隆—洼”的演化过程,不同岩性储集层的成岩序列和孔隙演化差异明显。火成岩和碎屑岩原生孔隙类型和成因明显不同,但现今储集空间均以次生孔隙特别是溶蚀孔为主,被溶蚀物质包括斑晶、基质以及火山岩屑等。溶蚀作用的主导流体多变,继抬升暴露过程中富含CO2的大气淡水之后,有机质成熟时排出的有机酸对储集层改善有积极作用。有利风化壳储集层的形成受到岩性、埋藏演化过程和成岩流体的共同控制。整体上,富林洼陷白垩系西洼组储集层质量由好到次的顺序为: 凝灰质砂砾岩,火山角砾岩,含残余气孔安山岩,凝灰岩,次火山岩;不同岩性风化壳储集层在复杂埋藏过程中,经历了不同的成岩改造。
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| 关 键 词： | 风化壳储集层 安山岩 凝灰岩 成岩作用 济阳坳陷沾化凹陷 白垩系 |
| 收稿时间： | 2020-03-06 |
Diagenetic of the Mesozoic complex weathering crust reservoir rock in Fulin subsag,Jiyang Depression |
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| Zhu Shi-Fa,Jia Ye,Wan Chao-Fan,Ma Li-Chi,Cui Dian,Sun Chao,Jing An-Yu.Diagenetic of the Mesozoic complex weathering crust reservoir rock in Fulin subsag,Jiyang Depression[J].Journal of Palaeogeography,2020,22(3):555-569. |
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| Authors: | Zhu Shi-Fa Jia Ye Wan Chao-Fan Ma Li-Chi Cui Dian Sun Chao Jing An-Yu |
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| Institution: | 1.State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing 102249,China;2.College of Geosciences,China University of Petroleum,Beijing 102249,China;3.Exploration and Development Research Institute,Shengli Oilfield Company,SINOPEC,Shandong Dongying 257015,China |
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| Abstract: | The formation of weathering crust reservoirs and the analysis of their differences have become the current research focus of reservoir geology. The Mesozoic oil and gas exploration in the Fulin subsag of Zhanhua sag in the Jiyang Depression of Bohai Bay Basin has encountered its bottleneck. Only the weathering crust at top of the Cretaceous is currently penetrated by exploration wells and the weathering crust reservoir is characterized by complex lithology and high heterogeneity. In order to enhance exploration in the Mesozoic buried hill reservoir in the study area and even the Jiyang Depression,it's of great importance to figure out diagenetic evolution,reservoir space types and their combination relationships. The complex lithology of weathering crust reservoir rock of the Cretaceous Xiwa Formation in the Fulin subsag was studied by core and thin section observation combining with well logging data. The results show that the key lithologies of weathering crust include andesite and tuff,followed by dyke,cryptoexplosive breccia and glutenite. During the complex burial process,different tectonic units underwent the evolution of 'sag-uplift-uplift' or 'sag-uplift-sag',resulting in significant differences for diagenetic sequence and pore evolution of different reservoir rocks. The primary pore types and their genesis of igneous and clastic rocks are obviously different,but the present reservoir space is dominated by secondary pores,especially dissolution pores. The dissolved material includes porphyry,matrix and volcanic debris. The dominant fluid for dissolution is variable. In addition to the atmospheric fresh water rich in CO2 during the uplifting and exposure,the organic acid discharged during the maturation of organic matter has a positive effect on improving reservoir quality. The formation of favorable weathering crust reservoir rock is controlled by lithology,burial evolution and diagenetic fluid. On the whole,the reservoir quality order of the Cretaceous Xiwa Formation in the Fulin subsag is as follow: Volcaniclastic rock,vesicular andesite,tuff,subvolcanic rock. Different weathering crust reservoir rocks in the study area underwent different diagenetic modification during the complex burial process. |
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| Keywords: | weathering crust reservoir rock andesite tuff diagenesis Zhanhua sag of Jiyang Depression Cretaceous |
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