| 文昌A凹陷珠海组低渗砂岩成岩特征与孔隙演化 |
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| 引用本文： | 徐燕红,杨香华,梅廉夫,王萌,王宁.文昌A凹陷珠海组低渗砂岩成岩特征与孔隙演化[J].地球科学,2020,45(6):2172-2185. |
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| 作者姓名： | 徐燕红 杨香华 梅廉夫 王萌 王宁 |
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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No.2016ZX05024-006 |
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| 摘 要： | 基于薄片鉴定分析、扫描电镜、物性分析、X射线衍射分析、碳酸盐碳氧同位素分析等实验手段, 研究文昌A凹陷珠海组低渗砂岩储层岩石学特征和成岩作用特征, 通过定量化分析, 评价压实、胶结、溶蚀作用对储层孔隙演化的影响, 实现成岩相预测及储层分类评价.结果表明:（1）研究区珠三南断裂带以岩屑砂岩和长石岩屑砂岩为主, 中、粗砂岩含量高; 6号断裂带以长石岩屑砂岩和岩屑石英砂岩为主, 细砂岩含量高.储集空间以次生溶孔为主, 物性变化大, 纵向及平面均表现出明显的分带性.（2）机械压实造成珠海组原生粒间孔隙大量丧失; 含铁碳酸盐、自生伊利石、硅质胶结等使粒间孔进一步减少, 早期绿泥石则能抑制石英次生加大; 溶蚀作用使深部储层物性得以改善, 研究区珠海组发育两个次生溶蚀带.成岩相预测结果表明, 发育厚层粗粒级砂岩的水下分流河道是研究区的有利储集相带.（3）通过孔隙演化定量分析, 认为成岩作用对粗粒砂岩和细-中粒砂岩的孔隙度演化的影响具有差异性.
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| 关 键 词： | 低渗砂岩 成岩作用 成岩相 孔隙演化 石油地质 |
| 收稿时间： | 2019-08-11 |
Diagenetic Characteristics and Porosity Evolution of Low Permeability Sandstone Reservoir in Zhuhai Formation,Wenchang A Sag |
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| Abstract: | Petrology and diagenesis of low permeability sandstone reservoirs in Zhuhai Formation were studied by means of thin sections identification, scanning electron microscopy (SEM), physical property, X-ray diffraction (XRD) analysis and carbon and oxygen isotope. The research of Wenchang A sag, Zhuhai Group of low permeability sandstone reservoir petrology characteristics and characteristics of diagenesis and the quantitative analysis was carried out on the rock strength, compaction, cementation, dissolution, the impact on the reservoir pore evolution. Quantitative analysis of diagenetic strength was carried out to evaluate the effects of compaction, cementation and dissolution on reservoir pore evolution. The results show as follows. (1) The Zhu-3 south fault zone is mainly composed of lithic sandstone and feldspar lithic sandstone with high content of medium and coarse sandstone. However the 6th fault zone is mainly feldspar lithic sandstone and lithic quartz sandstone with high fine sandstone content. The storage space is dominated by secondary dissolution pores, and the physical properties change greatly and show obvious zonation in both longitudinal and plane. (2) Mechanical compaction caused a large number of loss of primary intergranular pores in Zhuhai Formation. Iron-bearing carbonate, authigenic illite and siliceous cement further reduced the intergranular pores, while early chlorite inhibited quartz overgrowth. The dissolution improves the physical properties of deep reservoirs and two secondary dissolution zones developed in the Zhuhai Formation. According to the diagenetic facies prediction, the subaqueous distributary channel with thick layers, coarse-grained sandstones is a high-quality reservoir development zone in the study area.(3) Through quantitative analysis of porosity evolution, it is concluded that diagenesis has different effects on the porosity evolution of coarse and fine-medium grained sandstones. |
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