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震旦系灯影组白云岩多级次岩溶储层叠合发育特征及机制
引用本文:朱东亚,金之钧,张荣强,张殿伟,何治亮,李双建. 震旦系灯影组白云岩多级次岩溶储层叠合发育特征及机制[J]. 地学前缘, 2014, 21(6): 335-345. DOI: 10.13745/j.esf.2014.06.032
作者姓名:朱东亚  金之钧  张荣强  张殿伟  何治亮  李双建
作者单位:中国石油化工股份有限公司 石油勘探开发研究院 构造与沉积储层实验室, 北京 100083
基金项目:国家自然科学基金项目(41372149,41230312,41002037);国家重点基础研究发展计划“973”项目(2012CB214802);国家重大专项(2011ZX05005-002)
摘    要:受加里东早期桐湾运动一幕和二幕强烈构造抬升运动影响,震旦系灯影组二段和四段白云岩顶部分别遭受了强烈长期区域性不整合面岩溶作用。除顶部不整合面岩溶之外,灯影组二段和四段白云岩层内部也都见有多个具有层状特征的短期岩溶发育段,与灯影组二段和灯影组四段沉积过程中多个短期构造抬升沉降旋回有关,在四级层序界面下发育。在短期构造抬升事件影响下,相对海平面下降,白云岩暴露地表,发生同生/准同生期短期层内岩溶作用;形成多个几米至十几米厚的白云岩层内岩溶孔洞发育段;岩溶孔洞发育段之间为短期构造沉降期间较深水环境下沉积形成的致密泥晶白云岩、泥质白云岩或硅质白云岩层。四川盆地北部南江县映水坝剖面灯影组二段和四段分别识别出4层和8层层内短期岩溶发育段;川中乐山-龙女寺隆起钻井对比在灯影组二段白云岩中识别出6层层内短期岩溶发育段。白云岩层内的多个同生/准同生期短期岩溶发育段在垂向上的叠加形成了现今灯影组具有较大厚度的白云岩储层。桐湾一幕和二幕长期不整合面岩溶作用使灯影组二段或四段内部的短期岩溶层储集性能进一步改善。

关 键 词:灯影组  白云岩  岩溶  不整合  相对海平面  
收稿时间:2013-03-04

Characteristics and developing mechanism of Sinian Dengying Formation dolomite reservoir with multi-stage karst
ZHU Dong-E,JIN Zhi-Jun,ZHANG Rong-Qiang,ZHANG Dian-Wei,HE Zhi-Liang,LI Shuang-Jian. Characteristics and developing mechanism of Sinian Dengying Formation dolomite reservoir with multi-stage karst[J]. Earth Science Frontiers, 2014, 21(6): 335-345. DOI: 10.13745/j.esf.2014.06.032
Authors:ZHU Dong-E  JIN Zhi-Jun  ZHANG Rong-Qiang  ZHANG Dian-Wei  HE Zhi-Liang  LI Shuang-Jian
Abstract:Under the impact of strong tectonic uplifts of Tongwan Ⅰ and Ⅱ in the early Caledonian orogeny, the top of the second and fourth members of the Sinian Dengying Formation underwent intensive long term unconformity karstification, respectively. In addition to the karst associated with unconformity on the top, there are also some stratiform short term karst layers within the second and fourth members of dolomite. The short term karst layers were developed under fourth order sequence boundaries and were associated with multiple short term tectonic uplift subside cycles during the sedimentation of the second and fourth member of dolomite. Under the impact of short term tectonic uplifts as well as the fall of relative sea level, the dolomite exposed to surface and underwent contemporaneous/penecontemporaneous karstification which formed some layers of several meters with a large number of dissolution pores and caves within the second or fourth dolomite members. The sediment between two karst layers is always the compact cryptocrystalline dolomite, argillaceous dolomite or siliceous dolomite formed in deep water environment during tectonic subsidence. Four and eight short term karst layers were respectively identified in the second and fourth members of the Sinian Dengying Formation in the Yingshuiba outcrop in the north of the Sichuan Basin; and six were identified in the second member in the Leshan Longnüsi uplift by well correlation. The multiple short term contemporaneous / penecontermporaneous karst layers within dolomite members stacked each other vertically, which made the present Dengying Formation dolomite reservoir with relatively big thickness. The reservoir property associated with short term karst was further enhanced by the long term unconformity karstification associated with tectonic uplifts of Tongwan Ⅰ and Ⅱ in the early Caledonian orogeny.
Keywords:Dengying Formation  dolomite  karst  unconformity  sea level  
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