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天然气地球科学 ›› 2019, Vol. 30 ›› Issue (12): 1743–1754.doi: 10.11764/j.issn.1672-1926.2019.07.015

• 天然气地质学 • 上一篇    

北部湾盆地涠西南凹陷古近系流三段成岩作用及对储层物性影响

谢宁1(),操应长1,2(),王健1,2,金杰华1,张文杰1,钟泽红3   

  1. 1. 中国石油大学（华东）地球科学与技术学院，山东 青岛 266580
    2. 海洋国家实验室海洋矿产资源评价与探测技术功能实验室，山东 青岛 266580
    3. 中海石油（中国）有限公司湛江分公司研究院，广东 湛江 524057
  • 收稿日期:2019-06-10 修回日期:2019-07-15 出版日期:2019-12-10 发布日期:2020-03-25
  • 通讯作者: 操应长 E-mail:xiening9395@163.com;cyc8391670@163.com
  • 作者简介:谢宁（1996-），女，河南信阳人，硕士研究生，主要从事沉积学和储层地质学研究. E-mail：xiening9395@163.com.
  • 基金资助:
    国家科技重大专项专题“低渗透—致密油储层表征新技术与‘甜点’评价新方法”(2017ZX05009001);中央高校科研业务费专项资金“致密油储层储集性能表征及‘甜点’评价”(18CX05027A)

Diagenesis and its control on physical property of the reservoirs in the 3rd member of the Paleogene Liushagang Formation in Weixinan Depression, Beibuwan Basin

Ning Xie1(),Ying-chang Cao1,2(),Jian Wang1,2,Jie-hua Jing1,Wen-jie Zhang1,Ze-hong Zhong3   

  1. 1. School of Geoscience in China University of Petroleum, Qingdao 266580, China
    2. Laboratory for Marine Mineral Resource, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266580, China
    3. Research Institute of Zhanjiang Branch, CNOOC China Limited, Zhanjiang 524057, China
  • Received:2019-06-10 Revised:2019-07-15 Online:2019-12-10 Published:2020-03-25
  • Contact: Ying-chang Cao E-mail:xiening9395@163.com;cyc8391670@163.com

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摘要：

通过岩心观察、薄片鉴定、物性测试、扫描电镜、阴极发光等手段，以及定性描述和定量表征相结合的方法，对北部湾盆地涠西南凹陷流三段储层成岩作用特征及其对储层物性影响进行分析。结果表明：研究区流三段储层孔隙度以中低孔为主，渗透率非均质性强，成岩环境经历了弱碱性—酸性—碱性—弱酸性的演化过程。压实作用强度以中—强为主，是储层的主要减孔机制，主要受控于埋藏深度；胶结作用强度以中—弱为主；溶蚀作用强度中等，使储层物性得到改善。当砂泥厚度比大于1时,距离砂泥岩界面越近，碳酸盐胶结作用越强，溶蚀作用越弱，物性越差，有利储层应发育在厚层砂体中部。断层作为流体介质运移的疏导通道，靠近大断裂或次级断层的地层，溶蚀强烈。

关键词: 成岩作用, 储层特征, 控制因素, 涠西南凹陷, 古近系

Abstract:

Based on the core observation, thin sections identification, geophysical property, scanning electron microscope, cathodoluminescence tests, diagenesis and its control on physical property of the reservoirs in the 3rd member of the Liushagang Formation (El 3) in the Weixinnan Depression were analyzed by using the method of qualitative description and quantitative characterization. The research shows that the physical properties of reservoirs in study zone can be summarized as medium-low porosity and heterogeneous permeability, and the diagenetic environment of reservoir has changed from weak alkaline, acidic, alkaline to weak acidic conditions. The compaction intensity is mainly moderate-strong, and the cementation intensity is mainly moderate-weak. The compaction, which is mainly controlled by the buried depth, is the main mechanism of pore reduction in the reservoirs. The dissolution intensity is moderate, so as to improve the reservoir physical properties. When the thickness ratio of sand to mud is greater than one, the carbonate cementation and dissolution are affected by the distance to the interface of sand and mudstone. With the decrease of distance, the carbonate cementation intension enhances, the dissolution intension weakens, so the favorable reservoirs may develop in the middle of thick sandstone bodies. The structural fractures caused by the major activities can be the main migration channel of the fluid medium. The reservoirs which closing to large faults or secondary faults may cause strong corrosion.

Key words: Diagenesis, Reservoir characteristics, Controlling factors, Weixinan Depression, Paleogene

中图分类号: 

  • TE122.2

图1

涠西南凹陷流三段区域构造位置及沉积分布"

图2

涠西南凹陷流三段储层岩石组分三角图"

图3

涠西南凹陷流三段储层储集物性特征"

图4

涠西南凹陷流三段储层成岩作用特征 （a）WZ11-8-2井，2 988.5m，线—凹凸接触（-）；（b）WZ10-3-1井，1 936.8m，云母塑形变形（-）；（c）WAN4井，2 723.17m，高岭石交代石英加大边（-）；（d）WAN2井，2 795.27m，霉粒状黄铁矿充填溶蚀孔隙（-）；（e）WAN2井，2 795.27m，霉粒状黄铁矿充填溶蚀孔隙（反射光）；（f）WAN2井，2 755.6m，2期石英加大边（-）；（g）WAN2井，2 755.6m，2期石英加大边（阴极发光）；（h）WZ10-3W-1井，2 154.3m，方解石交代白云石（-）；（i）WZ10-3W-1井，2 154.3m，方解石交代白云石（+）；（j）WAN2井，2 742.06m，铁方解石胶结（-）；（k）WZ10-3-1井，1 941.76m，长石先溶蚀，后菱铁矿胶结充填（-）；（l）WZ11-2-2井，3 251.7m，铁方解石充填长石溶孔（-）；（m）WAN2井，2 795.55m，铁方解石交代含铁方解石（-）；（n）WAN4井，2 757.9m，方解石、白云石交代高岭石（-）；（o）WAN2井，2 795.68m，方解石交代菱铁矿（-）；（p）WAN2井，2 795.55m，含铁方解石边缘溶蚀（-）；（q）WZ10-3-13井，2 038.3m，菱铁矿内部溶蚀（-）；（r）WAN2井，2 757.9m，方解石交代石英加大边（-）；（s） WAN2井，2 757.9m，方解石交代石英加大边（+）；（t）WZ11-1-1井，2 718.4m，菱铁矿交代石英加大边（-）；（u）WZ11-1-1井，2 718.4m，菱铁矿交代石英加大边（+）"

图5

涠西南凹陷流三段储层压溶指数与石英加大边含量的关系"

图6

涠西南凹陷流三段储层原生孔隙与次生孔隙含量垂向分布特征"

图7

涠西南凹陷流三段WZ11-4N-A井储层埋藏史及成岩作用演化（埋藏史据文献[19]修改）"

表1

涠西南凹陷流三段储层中压实、胶结、溶蚀作用对储层质量影响程度的分级标准"

成岩作用程度

压实减孔率

(P 压实)/%

胶结减孔率

(P 胶结)/%

溶蚀增孔率

(P 溶蚀)/%
强 >70 >30 >50
中 70~30 30~10 50~20
弱 <30 <10 <20

图8

涠西南凹陷流三段储层压实减孔量、压实减孔率垂向变化关系"

图9

涠西南流三段储层压实减孔率与胶结减孔率的对比"

图10

涠西南凹陷流三段储层碳酸盐胶结物含量、溶蚀面孔率与孔隙度与距砂泥岩界面关系"

图11

涠西南凹陷WZ10-3W-1井流三段砂体不同位置孔隙度及储层成岩作用特征"

图12

涠西南凹陷流三段储层孔隙度与距断层距离的关系"

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