地学前缘 ›› 2021, Vol. 28 ›› Issue (6): 134-145.DOI: 10.13745/j.esf.sf.2021.1.49

• 钾盐探测新技术 • 上一篇    下一篇

柴达木盆地西部黑北凹地—大浪滩深层卤水钾盐储卤层地震响应特征研究

侯献华1, 王伟2,*, 郑绵平1, 樊馥1, 李洪普3, 高雪峰4   

  1. 1.中国地质科学院 矿产资源研究所 自然资源部盐湖资源与环境重点实验室, 北京 100037;
    2.中国科学院 地理科学与资源研究所 资源与环境信息系统国家重点实验室, 北京 100101;
    3.青海省柴达木综合地质矿产勘查院 青海省柴达木盆地盐湖资源勘探研究重点实验室, 青海 格尔木 816000;
    4.中国石油青海油田分公司, 甘肃 敦煌736202
  • 收稿日期:2021-01-09 修回日期:2021-01-30 出版日期:2021-11-25 发布日期:2021-11-25
  • 通讯作者: *王 伟(1972—),男,博士,副研究员,研究生导师,主要从事地震波传播理论及应用研究。E-mail: wang_wei@lreis.ac.cn
  • 作者简介:侯献华(1972—),男,教授级高级工程师,主要从事盐类资源调查评价与成盐环境研究。E-mail:hxh2858@126.com
  • 基金资助:
    国家重点研发计划项目“重点陆相盆地深层含钾卤水富集规律与成矿预测(2017YFC0602802)”; 国家自然科学基金项目“基于槽波的小尺度煤田陷落柱精细探测研究(41641040)”; 中国地质调查局地质调查项目“思茅盆地中生代海相钾盐资源调查评价(DD20201115)”

Seismic response characteristics of the Heibei Concave-Dalangtan potassium-rich deep brine reservoir in western Qaidam Basin

HOU Xianhua1, WANG Wei2,*, ZHENG Mianping1, FAN Fu1, LI Hongpu3, GAO Xuefeng4   

  1. 1. Ministry of Natural Resources Key Laboratory of Saline Lake Resources and Environments, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;
    2. Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China;
    3. Qinghai Key Laboratory of Salt Lake Resources Exploration and Research in Qaidam Basin, Qinghai Qaidam Integrated Institute of Geology and Mineral Resource Exploration,Golmud 816000, China;
    4. Qinghai Oilfield Company, PetroChina, Dunhuang 736202, China
  • Received:2021-01-09 Revised:2021-01-30 Online:2021-11-25 Published:2021-11-25

RichHTML

12

PDF (PC)

131

摘要： 柴达木盆地西部深层卤水型钾盐是近期新发现的一种以砂砾层为储存介质的氯化钠亚型钾盐资源,其中,以黑北凹地—大浪滩次级盐湖凹地工作程度较高,研究也相对深入。该区已经求取该类型KCl资源量(333)约3.5亿吨。对该类型成矿地质体的解剖可对该区钾盐找矿在面上和纵深拓展提供借鉴。鉴于此,笔者根据实际生产需要,系统收集了该区的钻井、测录井及地震探测资料,通过地震资料解释和属性分析,对比钻孔揭露储卤层岩性特征,获得研究区域内中深部孔隙储卤层地震响应特征:储卤层底部同相轴振幅较强、局部连续性较好,顶部同相轴为中-强振幅,内部多为弱反射振幅,成团块状;瞬时频率属性表现为中-低频反射特征;甜点属性表现为顶、底为甜点高值而内部为甜点低值的特征;包络属性表现为顶、底为异常高值而储层内部为低值分布。通过对地震剖面及钻孔资料分析,建立了砂砾储卤层的地球物理识别标志,为预测中深部储卤层分布范围及优选水文-地质钻孔提供依据。

关键词: 砂砾储卤层, 属性分析, 水文-地质钻孔, 黑北凹地—大浪滩;, 柴达木盆地

Abstract: The deep brine type potash in western Qaidam Basin is a newly discovered sodium chloride subtype potash deposit with gravel layers as the storage media. In particular, a great deal of in-depth research has been done in the Heibei Concave (or Heibei'aodi)-Dalangtan secondary salt lake depression, where ~350 million tons of KCl resource of this subtype has been obtained. By dissecting this type of ore-forming system one can provide reference for the exploration of potash deposits in the area. The Heibei'aodi-Dalangtan area is the main distribution area of brine reservoir, a piedmont proluvial fan type pore brine reservoir in northeastern Qaidam Basin. In this study, we collected drill, logging and seismic-prospecting data according to the actual production needs. Through seismic reflection profile interpretation and attribute analysis, as well as drill data comparison revealing the reservoir lithology characteristics and distribution, we obtained the seismic response characteristics of the medium-deep pore brine reservoir in the study area. High amplitude in-phase reflections appeared at the bottom of the reservoir, with good local continuity; medium to high amplitude in-phase reflections were observed at top of the reservoir; at the lumpy middle part low amplitude reflections were recorded. The instantaneous frequencies were mainly medium to low frequencies. Larger “sweet spots” were observed at the bottom and top of the reservoir compared to the middle part with a low sweetness value. The envelope attribute was characterized by abnormal high peak values at the top and bottom and low peak values at the middle part of the reservoir. Through seismic profile and borehole data analyses, geophysical indicators for potash deposits were established, which provided a basis for predicting the distribution range of medium-deep reservoir and optimizing hydrogeological survey for borehole drilling.

Key words: gravel brine reservoir, attribute analysis, borehole drilling, Heibei Concave-Dalangtan, Qaidam Basin

中图分类号: