石油勘探与开发 >

2021 , Vol. 48 >Issue 3: 562 - 574

DOI: https://doi.org/10.11698/PED.2021.03.11

油气勘探

四川盆地北部中二叠世晚期“广元—旺苍”海槽特征及其油气地质意义

  • 王兴志 ,
  • 李博 ,
  • 杨西燕 ,
  • 文龙 ,
  • 徐亮 ,
  • 谢圣阳 ,
  • 杜垚 ,
  • 冯明友 ,
  • 杨雪飞 ,
  • 王雅萍 ,
  • 裴森奇
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  • 1.油气藏地质及开发工程国家重点实验室 西南石油大学,成都 610500;
    2.西南石油大学地球科学与技术学院,成都 610500;
    3.中国石油西南油气田公司勘探开发研究院,成都 610500;
    4.中国石油西南油气田公司勘探事业部,成都 610500;
    5.中国石油西南油气田公司川西北气矿,四川江油 621700
王兴志（1964-）,男,四川南充人,博士,西南石油大学教授,主要从事沉积学与储集层地质学的教学与研究工作。地址:四川省成都市新都区,西南石油大学地球科学与技术学院,邮政编码:610500。E-mail:wxzswpi@163.com

收稿日期: 2020-06-26

  网络出版日期: 2021-05-21

基金资助

国家科技重大专项“四川盆地二、三叠系构造-沉积演化及储层形成机制研究”（2016ZX05007004-001）; 国家科技重大专项“全球性海侵（湖侵）与气候变化对大型地层油气藏形成的控制作用”（2017ZX05001001-002）; 西南石油大学科研启动项目（2017QHZ005）; 中国石油创新基金（2018D-5007-0105）

收起

Characteristics of “Guangyuan-Wangcang” trough during late Middle Permian and its petroleum geological significance in northern Sichuan Basin, SW China

  • WANG Xingzhi ,
  • LI Bo ,
  • YANG Xiyan ,
  • WEN Long ,
  • XU Liang ,
  • XIE Shengyang ,
  • DU Yao ,
  • FENG Mingyou ,
  • YANG Xuefei ,
  • WANG Yaping ,
  • PEI Senqi
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  • 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China;
    2. School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China;
    3. Research Institute of Exploration and Development, PetroChina Southwest Oil & Gasfield Company, Chengdu 610500, China;
    4. Exploration Division of PetroChina Southwest Oil & Gasfield Company, Chengdu 610500, China;
    5. Northwest Sichuan Gas Mine of PetroChina Southwest Oil & Gasfield Company, Jiangyou 621700, China

Received date: 2020-06-26

  Online published: 2021-05-21

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摘要

基于野外露头特征,结合区域构造背景,综合钻井及地球物理资料,利用宏观与微观观察、地球化学元素测试、总有机碳含量及镜质体反射率测定等对四川盆地北部中二叠统茅口组沉积特征进行研究。结果表明,在中二叠统茅口组沉积晚期,川北地区广元—旺苍一带存在一套富有机质的深水沉积,该套地层自北西向南东方向分布,厚10~30 m,以硅质岩、硅质泥岩等为主夹重力流沉积。硅质岩、硅质泥岩单层厚度薄、层面平整,富含硅质放射虫、海绵骨针及体小壳薄的腕足类生物化石,具有典型的深水海槽相沉积特征。地球化学测试硅质岩类中的铜、钴、钼、镍等元素含量以及镍与钴含量的比值等指标均指示此套沉积属深水还原环境下的产物,其TOC值为3.21%~8.19%,平均值为5.53%,具有良好的生烃能力。海槽南侧为较高能的台地边缘相区,沉积的主要是厚层块状泥-亮晶生物（屑）灰岩,有利于储集层的形成。茅口组沉积晚期,扬子板块西北缘勉略洋壳向北俯冲与“广元—旺苍”海槽的形成提供了内在动力条件。从该海槽的发育位置、沉积特征和形成动力来看,与前人提出的晚二叠世“开江—梁平”海槽相似,因此认为“开江—梁平”海槽在中二叠世晚期就已经具有雏形。图13表2参37

关键词： 四川盆地; 广元-旺苍海槽; 中二叠统; 茅口组; 深水沉积; 硅质岩

本文引用格式

王兴志 , 李博 , 杨西燕 , 文龙 , 徐亮 , 谢圣阳 , 杜垚 , 冯明友 , 杨雪飞 , 王雅萍 , 裴森奇 . 四川盆地北部中二叠世晚期“广元—旺苍”海槽特征及其油气地质意义[J]. 石油勘探与开发, 2021 , 48(3) : 562 -574 . DOI: 10.11698/PED.2021.03.11

Abstract

Based on outcrop characteristics, combined with regional tectonic background, drilling and geophysical data, the sedimentary characteristics of the Middle Permian Maokou Formation in the northern Sichuan Basin was studied by means of macroscopic and microscopic observation, geochemical element test, total organic carbon content and vitrinite reflectance measurement. There is a set of deep-water sediments rich in organic matter in the Guangyuan-Wangcang area of northern Sichuan during the late depositional period of the Middle Permian Maokou Formation. The strata are distributed from northwest to southeast, with thickness of 10-30 m, mainly composed of siliceous rocks and siliceous mudstones, intercalated with gravity flow deposits. Siliceous rocks and siliceous mudstones are characterized by thin single layer, flat bedding and rich siliceous radiolarians, calthrop and brachiopod with small body and thin shell, belonging to the typical sedimentary characteristics of deep-water trough facies. The contents of Cu, Co, Mo, Ni and the ratio of Ni to Co in the geochemical tests all indicate that the siliceous rocks are products of deep-water reducing environment. The TOC value ranges from 3.21% to 8.19%, with an average of 5.53%, indicating that the siliceous rocks have good hydrocarbon generation ability. The south side of the trough is in platform margin facies with high energy, and the sediments are mainly thick massive micritic-calcsparite biogenic (clastic) limestone, which is conducive to the formation and evolution of the reservoir. During the late sedimentary period of the Maokou Formation, the northward subduction and extension of the oceanic crust at the northwestern margin of the Yangtze Plate provided the internal dynamic conditions for the formation of the “Guangyuan-Wangcang” trough. According to the location, sedimentary characteristics and formation dynamics of the trough, it is similar to the “Kaijiang-Liangping” trough during Late Permian proposed by previous researchers. It is believed that the “Kaijiang-Liangping” trough already had its embryonic form during the Late Middle Permian.

Key words： Sichuan Basin; Guangyuan-Wangcang trough; Middle Permian; Maokou Formation; deep-water deposition; siliceous rock

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