古地理学报 ›› 2015, Vol. 17 ›› Issue (4): 541-552. doi: 10.7605/gdlxb.2015.04.044

• 岩相古地理学及沉积学 • 上一篇    下一篇

鄂尔多斯盆地富县探区三叠系延长组震积岩及其地质意义

田媛1, 钟建华1, 王书宝2, 陶红胜2, 刘韶光2, 李勇1, 孙宁亮1, 邵珠福3, 倪良田1, 毛毳1, 葛玉柱1, 陈彬1, 曲俊利1, 王桂林1   

  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 陕西延长石油(集团)有限责任公司,陕西西安 710075
    3 东北石油大学地球科学学院,黑龙江大庆 163318
  • 收稿日期:2015-03-18 出版日期:2015-08-01 发布日期:2015-08-01
  • 通讯作者: 钟建华,男,1957年生,中国石油大学(华东)教授,主要从事沉积学及岩石力学研究。E-mail: 957576033@qq.com。
  • 作者简介:田媛,女,1990年生,中国石油大学(华东)硕士研究生,主要研究方向为沉积学及层序地层学。E-mail: tianyuan93@163.com。

Seismites and their geological significances of the Triassic Yanchang Formation in Fuxian exploration area, Ordos Basin

Tian Yuan1, Zhong Jianhua1, Wang Shubao2, Tao Hongsheng2, Liu Shaoguang2, Li Yong1, Sun Ningliang1, Shao Zhufu3, Ni Liangtian1, Mao Cui1, Ge Yuzhu1, Chen Bin1, Qu Junli1, Wang Guilin1   

  1. 1 School of Geosciences,China University of Petroleum(East China),Qingdao 266580,Shandong
    2 Research Institute of Yanchang Petroleum(Group)Co.,Ltd.,Xi'an 710075,Shaanxi
    3 College of Geosciences, Northeast Petroleum University, Daqing 163318,Heilongjiang
  • Received:2015-03-18 Online:2015-08-01 Published:2015-08-01
  • Contact: Zhong Jianhua,born in 1957,is a professor of China University of Petroleum(East China). He is mainly engaged in sedimentology and rock mechanics researches. E-mail: 957576033@qq.com.
  • About author:Tian Yuan,born in 1990,is a master degree candidate of China University of Petroleum(East China). She is mainly engaged in sedimentology and sequence stratigraphy. E-mail: tianyuan93@163.com.

摘要:

通过对26口井岩心观察,结合区域构造背景,在鄂尔多斯盆地富县探区三叠系延长组中识别出典型的震积岩。该区震积岩代表性沉积构造有液化砂脉、液化卷曲变形、环状层理、负载构造、球枕构造、微断层、微裂缝、震裂岩与震碎角砾岩,其中液化砂脉和液化卷曲变形是地震引起的主要软沉积变形构造。震积岩垂向序列划分为两类:一种以脆性变形为主,自下向上依次为下伏未震层,扰动层,微断层、微裂缝及震裂岩层段,液化卷曲变形层段,震碎角砾岩层段,液化砂脉层段及上覆未震层;另一种以软沉积变形为主,自下至上依次为下伏未震层,环状层段,扰动层,球枕构造及负载构造层段,液化砂脉及液化卷曲变形层,枕状层及上覆未震层。富县探区延长组中的震积岩说明在该盆地晚三叠世存在一个强地震事件活跃期;震积岩中的微裂缝、微断层、震裂岩及液化砂脉可改善储集层物性,同时震碎角砾岩和网状砂脉也是良好的储集层。

关键词: 软沉积变形构造, 震积岩, 三叠系, 延长组, 垂向序列, 沉积模式, 鄂尔多斯盆地

Abstract:

Combined with regional tectonic setting,this study identifies typical seismites of the Upper Triassic Yanchang Formation in Fuxian exploration area of Ordos Basin through observation of cores from 26 drillholes. In the study area,representative sedimentary structures include liquefied sand-veins,liquefied curled deformation structures,loop beddings,load structures,ball-and-pillows,pillows,micro-faults,micro-fissures,and shatter breccias. Among these,liquefied sand-veins and liquefied curled deformation structures are the major earthquake-induced soft sediment deformation structures. The vertical successions of seismites are classified into two types:One is dominated by brittle deformations underlying and overlying unshocked layers,and consists of disturbed bedding layer,layer of step micro-fault,micro-fissure and seismic breccias,liquefied curled deformation layer,layer of shatter breccias,and liquefied sand-veins layer,respectively,from bottom to top;the other is dominated by soft-sediment deformations,which also underlies and overlies unshocked layers,and is divided into loop bedding layer,disturbed bedding layer,layer of ball-and-pillow and load structure,liquefied sand-veins and liquefied curled deformation layer,and pillow layer,respectively,from bottom to top. The seismites in the Yanchang Formation of Fuxian exploration area prove that there existed a competent structure and active periods of palaeotectonic movement;the presence of micro-faults,micro-fissures,shatter breccias and liquefied sand-veins is conductive to the improvement of reservoir physical property;furthermore,the seismic breccias and reticulate sand-veins are both good reservoirs.

Key words: soft-sediment deformation, seismite, Triassic, Yanchang Formation, vertical succession, sedimentation model, Ordos Basin

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