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珠江口盆地靖海凹陷火成岩发育特征及其地质意义

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文章导航 > 海洋地质与第四纪地质 > 2018 > 38(2): 96-105

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汪瑞良, 董马超, 蒲仁海, 吴晓川, 徐乐意. 珠江口盆地靖海凹陷火成岩发育特征及其地质意义[J]. 海洋地质与第四纪地质, 2018, 38(2): 96-105. doi: 10.16562/j.cnki.0256-1492.2018.02.010
引用本文: 汪瑞良, 董马超, 蒲仁海, 吴晓川, 徐乐意. 珠江口盆地靖海凹陷火成岩发育特征及其地质意义[J]. 海洋地质与第四纪地质, 2018, 38(2): 96-105. doi: 10.16562/j.cnki.0256-1492.2018.02.010
shu
WANG Ruiliang, DONG Machao, PU Renhai, Wu Xiaochuan, XU Leyi. Igneous rocks in Jinghai Sag, Pearl River Mouth Basin and their geological significance[J]. Marine Geology & Quaternary Geology, 2018, 38(2): 96-105. doi: 10.16562/j.cnki.0256-1492.2018.02.010
Citation: WANG Ruiliang, DONG Machao, PU Renhai, Wu Xiaochuan, XU Leyi. Igneous rocks in Jinghai Sag, Pearl River Mouth Basin and their geological significance[J]. Marine Geology & Quaternary Geology, 2018, 38(2): 96-105. doi: 10.16562/j.cnki.0256-1492.2018.02.010
shu

珠江口盆地靖海凹陷火成岩发育特征及其地质意义

  • 1.

    中海石油(中国)有限公司深圳分公司研究院，深圳 440300

  • 2.

    西北大学地质学系，西安 710069

  • 基金项目:
    国家自然科学基金重大项目“非常规油气勘探开发地球物理理论方法研究”课题——“中国非常规油气储层地质特征分类及典型地质模型建立”(41390451)；中海油深圳分公司委托项目“潮汕坳陷南部中、新生代叠合盆地石油地质条件评价”(CCL2014SZPS0493)
详细信息
    作者简介: 汪瑞良(1960—)，男，教授级高级工程师，主要从事地球物理方法在油气勘探开发中的研究，E-mail: wangrl@cnooc.com.cn

  • 中图分类号: P588.1

    • 文凤英编辑

Igneous rocks in Jinghai Sag, Pearl River Mouth Basin and their geological significance

  • 1.

    Guangzhou Institute, Shenzhen Branch, CNOOC Ltd, Shenzhen 440300, China

  • 2.

    Department of geology, Northwestern University, Xi'an 710069, China

    摘要

  • 利用三维地震对靖海凹陷的火成岩体进行了识别，火山岩沉积后上覆地层会直接超覆在火山岩体上，而侵入岩体形成的地层上拱和超覆现象发生在上覆地层之内的不整合面上。研究区岩浆活动时间可分为4期：自老到新依次为晚白垩世内部Tm18不整合形成期，晚中新世T35不整合形成期(10.5Ma)，上新世末T20不整合形成期(2.6Ma)和第四纪，且以第四纪火山活动最为强烈。火山口和侵入体主要沿北东向朝南大断裂分布，具小规模中心式分散分布特点，其分布趋势与古地温梯度朝南部洋壳区方向增大似乎没有关系。从绝大多数火山活动发生在第四纪且局部分布来看，它们对油气藏主要起有限的改造和破坏作用。

    Igneous rocks in the Jinghai sag are identified through 3D seismic interpretation by the contact relationship between the rocks and the overlying deposits. Four magmatic stages are recognized in the study area, separated by three unconformity reflections, i.e the late Cretaceous Tm18, the late Miocene T35 (10.5Ma), the late Pliocene T20 (2.6Ma) and the overlying Quaternary. Among them the Quaternary eruption is the strongest. Volcanic and intrusive bodies are mainly distributed along the NE trending Chaoshannan fault, in a form of scatter small scale central volcanoes. The distribution trend of the volcanoes seems irrelevant to the increase in paleogeothermal gradient toward the oceanic crust in the south. Limited impact is expected to the oil gas accumulations in the sag.

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  • 图 1  研究区位置图(修改自文献[22])

    Figure 1. 

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    图 2  潮汕坳陷和靖海凹陷地震解释-地质剖面

    Figure 2. 

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    图 3  Tm18界面上部火山岩地震反射(剖面位置见图 4)

    Figure 3. 

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    图 4  靖海三维区火成岩分布与Tg不整合断裂分布叠合图

    Figure 4. 

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    图 5  火成岩活动期次判别(剖面位置见图 4)

    Figure 5. 

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    图 6  靖海三维区火山岩剖面(剖面位置见图 4)

    Figure 6. 

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    图 7  靖海三维区14和15号侵入岩剖面(剖面位置见图 4中DD′)

    Figure 7. 

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    图 8  上白垩统内部Tm18界面附近的火山岩地震反射

    Figure 8. 

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收稿日期:  2016-05-19
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