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    文昌A凹陷珠海组低渗砂岩成岩特征与孔隙演化

    徐燕红 杨香华 梅廉夫 王萌 王宁

    徐燕红, 杨香华, 梅廉夫, 王萌, 王宁, 2020. 文昌A凹陷珠海组低渗砂岩成岩特征与孔隙演化. 地球科学, 45(6): 2172-2185. doi: 10.3799/dqkx.2020.055
    引用本文: 徐燕红, 杨香华, 梅廉夫, 王萌, 王宁, 2020. 文昌A凹陷珠海组低渗砂岩成岩特征与孔隙演化. 地球科学, 45(6): 2172-2185. doi: 10.3799/dqkx.2020.055
    Xu Yanhong, Yang Xianghua, Mei Lianfu, Wang Meng, Wang Ning, 2020. Diagenetic Characteristics and Porosity Evolution of Low Permeability Sandstone Reservoir in Zhuhai Formation, Wenchang A Sag. Earth Science, 45(6): 2172-2185. doi: 10.3799/dqkx.2020.055
    Citation: Xu Yanhong, Yang Xianghua, Mei Lianfu, Wang Meng, Wang Ning, 2020. Diagenetic Characteristics and Porosity Evolution of Low Permeability Sandstone Reservoir in Zhuhai Formation, Wenchang A Sag. Earth Science, 45(6): 2172-2185. doi: 10.3799/dqkx.2020.055

    文昌A凹陷珠海组低渗砂岩成岩特征与孔隙演化

    doi: 10.3799/dqkx.2020.055
    基金项目: 

    国家“十三五”油气重大专项 No.2016ZX05024-006

    详细信息
      作者简介:

      徐燕红(1991-), 女, 博士研究生, 主要从事储层地质研究工作.ORCID:0000-0002-8595-3163.E-mail:18062796419@163.com

      通讯作者:

      杨香华, E-mail:xhyang@cug.edu.cn

    • 中图分类号: P618.13

    Diagenetic Characteristics and Porosity Evolution of Low Permeability Sandstone Reservoir in Zhuhai Formation, Wenchang A Sag

    • 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.

       

    • 图  1  文昌凹陷构造单元划分(a)及地层系统(b)

      Fig.  1.  Structural units (a) and stratum system (b) of Wenchang depression

      图  2  文昌A凹陷珠海组储层碎屑结构统计特征

      Fig.  2.  Reservoir clastic structure characteristics of Zhuhai Formation in Wenchang A sag

      图  3  文昌A凹陷珠海组砂岩组分三角图

      Fig.  3.  The Q-F-R diagram of E3z sandstone of Wenchang A sag

      图  4  文昌A凹陷珠海组砂岩孔、渗分布特征

      Fig.  4.  Porosity and permeability distribution of sandstones in Wenchang A sag

      图  5  文昌A凹陷珠海组储层储集空间类型

      a.WC9-2-1井, 3 668.30 m, 长石溶孔, 粒内缝(箭头所示), ×50(-); b.WC9-2-1井, 3 787.40 m, 长石溶孔, ×25(-); c.WC10-2-1井, 3 341.70 m, 长石溶孔, ×50(-); d.WC10-3-1井, 3 333.70 m, 生物壳溶孔, ×50(-); e.WC14-3-1井, 2 247.59 m, 粒间孔、有孔虫体腔孔, ×200(-); f.WC10-3-1井, 3 761.75 m, 粒间孔, 颗粒表面附着片状绿泥石(SEM)

      Fig.  5.  Storage space types of Zhuhai Formation in Wenchang A sag

      图  6  文昌A凹陷珠海组压实作用特征

      a.WC9-2-1井, 3 667.10 m, 凹凸-线接触, 云母弯曲变形, ×100(-); b.WC9-2-3井, 3 787.40 m, 线接触, 颗粒破裂发育粒内缝, ×50(-); c.WC14-3-1井, 2 385.6 m, 基质充填, ×50(-); d.WC9-3-1井, 3 829 m, 云母等变形、海绿石化, ×100(-); e.WC9-2-3井, 3 994.20 m, 碎屑颗粒凹凸接触, ×50(-); f.WC9-2-1井, 3 668.16 m, 碎屑颗粒凹凸接触, 石英次生加大, ×500(+)

      Fig.  6.  Compaction characteristics of Zhuhai Formation in Wenchang A sag

      图  7  文昌A凹陷珠海组胶结作用特征

      a.WC9-2-1井, 3 201.70 m, 白云石胶结、交代碎屑颗粒, ×100(-); b.WC10-3-1井, 3 340.93 m, 橘黄色方解石、橘红色含铁方解石充填孔隙, ×50(CL); c.WC10-3-1井, 3 366 m, 含铁方解石基底式胶结, ×100(-); d.WC9-3-1井, 3 852 m, 薄膜状菱铁矿环边, ×200(+); e.WC9-3-1井, 3 852.0 m, 多期次石英次生加大, ×50(+); f.WC11-2E-1井, 3 082.7 m, 丝片状伊利石充填粒间孔隙, ×1630(SEM); g.WC9-2-3井, 3 991.00 m, 颗粒边缘绿泥石膜, ×400(-); h.WC11-2E-1井, 3 339.8 m, 粒表针状绿泥石, ×800(SEM); i.WC10-3-1井, 3 333.80 m, 绒球状绿泥石填充孔隙, ×2080(SEM)

      Fig.  7.  Characteristics of cementations in Zhuhai Formation of Wenchang A sag

      图  8  文昌A凹陷碳酸盐胶结物碳氧同位素相关性

      Fig.  8.  Carbon and oxygen isotope correlation of carbonate cement of Wenchang A sag

      图  9  砂岩储层有机-无机反应与次生孔隙成岩综合图

      Ⅰ.生物成气带; Ⅱ.热流体强化生烃带; Ⅲ.主成油Ⅰ带; Ⅳ.主成油Ⅱ带; Ⅴ.深层成气带; 据Surdam et al.(1989)

      Fig.  9.  Organic-inorganic reactions and secondary pore diagenesis in sandstone reservoirs

      图  10  文昌A凹陷珠海组成岩相微观特征

      a.弱压实相, WC14-3-1井, 2 245.61 m, ×100(-); b.中等压实中-强溶蚀相, WC9-2-3井, 3 787.40 m, ×25(-); c.中等压实中-强溶蚀相, WC10-2-1井, 3 687.22 m, ×150(SEM); d.强压实强溶蚀相, WC9-2-3井, 3 994.20 m, ×50(-); e.压实-充填相, WC14-3-1井, 2 250.11 m, ×50(-); f.碳酸盐致密胶结相, WC10-3-1井, 3 340.93 m, ×100(CL)

      Fig.  10.  Microscopic characteristics of diagenetic facies in Zhuhai Formation, Wenchang A sag

      图  11  文昌A凹陷珠海组成岩相交会图

      Fig.  11.  Crossplots for diagenetic facies in Zhuhai Formation, Wenchang A sag

      图  12  文昌A凹陷珠海组成岩相平面分布

      Ⅰ类.弱压实相; Ⅱ类.中等压实中-强溶蚀相; Ⅲ类.强压实强溶蚀相; Ⅳ类.压实充填相+碳酸盐致密胶结相

      Fig.  12.  Horizontal distribution of diagenetic facies in Zhuhai Formation, Wenchang A sag

      图  13  文昌A凹陷珠海组储层综合分析图

      Fig.  13.  Reservoir analysis of Zhuhai Formation in Wenchang A sag

      图  14  文昌A凹陷珠海组埋藏史及孔隙演化图

      Fig.  14.  Burial history and porosity evolution of Zhuhai Formation in Wenchang A sag

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