| 涠西南凹陷西北陡坡带流三段砂砾岩储层特征与主控因素 |
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| 引用本文： | 徐燕红,杨香华,梅廉夫.涠西南凹陷西北陡坡带流三段砂砾岩储层特征与主控因素[J].地球科学,2020,45(5):1706-1721. |
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| 作者姓名： | 徐燕红 杨香华 梅廉夫 |
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| 作者单位： | 1.中国地质大学构造与油气资源教育部重点实验室, 湖北武汉 430074 |
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| 基金项目： | 国家“十三五”油气重大专项2016ZX05024-006 |
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| 摘 要： | 通过岩心观察、薄片鉴定、扫描电镜、X射线衍射分析等实验手段，结合物性、有机质演化、埋藏史、测录井等资料，研究涠西南凹陷西北陡坡带流三段砂砾岩储层储集性能、成岩特征及物性主控因素.结果表明:（1）流三段储层岩石类型以岩屑砂岩为主，岩性以粗粒级砂砾岩、含砾粗砂岩为主，储集空间以粒内溶孔、残余粒间孔、铸模孔等为主，物性变化大，以低孔特低渗、中孔低渗、中孔中渗、高孔高渗为特征，非均质性强.（2）持续的压实作用是物性变差的主要原因，碳酸盐胶结和自生粘土矿物充填使部分原生孔隙丧失，高泥质含量部位表现为早期强压实；粗粒级砂岩的中-强溶蚀作用有利于次生孔隙的发育，而微裂缝是深层砂砾岩储层的重要渗流通道之一.西北斜坡带流三段扇三角洲水下分流河道发育厚层的砂砾岩、含砾粗砂岩，杂基含量低，压实作用较弱，是研究区的优质储层发育带；湖底扇压实作用强，微裂缝提供了有机酸性流体活动的渗流通道，砂砾岩储层发生次生溶蚀使储集性能得以改善，为深层相对有利储层.
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| 关 键 词： | 砂砾岩储层 成岩特征 物性主控因素 西北陡坡带 涠西南凹陷 油气地质 |
| 收稿时间： | 2019-07-14 |
Reservoir Characteristics and Main Control Factors of Conglomerate Reservoir of El3 in the Northwest Steep Slope Zone of Weixinan Depression |
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| Abstract: | Based on core observation, thin section examination, scanning electron microscopy, X-ray diffraction analysis and other experimental means, the reservoir performance, diagenetic characteristics and main control factors of conglomerate reservoir quality are studied in the third member of Liushagang Formation of northwest steep slope zone in Weixinan depression, combined with physical properties, organic matter thermal evolution, burial history and logging data. The results show as follows: (1) The main rock type of study area is litharenite, and the main lithologies are glutenite, conglomeratic sandstone and other coarse grained sandstones, with varying reservoir space types such as intragranular dissolved pores, residual intergranular pores, and mold pores. The physical properties, characterized by low porosity-ultra low permeability, medium porosity-low permeability, medium porosity-permeability and high porosity-permeability, show strong heterogeneity. (2) Continuous compaction is the major reason for the deterioration of physical properties. Carbonate cementations and authigenic clay minerals filling result in the loss of some primary pores, and the sites with high argillaceous content are characterized by early strong compaction. The medium strong dissolution of coarse grained sandstone is conducive to the development of secondary pores, and micro-fracture is one of the most important flow passages in deep glutenite reservoirs. The fan-delta subaqueous distributary channel in the third member of Liushagang Formation of the northwest steep slope zone develops thick layers of glutenite and conglomeratic sandstone with low content of matrix and weak compaction. It is a high-quality reservoir development zone in the study area. The compaction of sublacustrine fan is strong, while the micro-fracture provides the flow passages for organic acidic fluid migration. The secondary dissolution of the conglomerate reservoir improves the reservoir performance and is relatively favorable reservoir for the deep sandstones. |
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