石油学报 ›› 2009, Vol. 30 ›› Issue (5): 678-684.DOI: 10.7623/syxb200905008

• 地质勘探 • 上一篇    下一篇

大庆长垣南部黑帝庙浅层生物气的断层侧向封闭性

付晓飞1, 潘国强1, 贺向阳2, 玄昌姬1, 吕亚娟1   

  1. 1. 大庆石油学院地球科学学院, 黑龙江大庆 163318;
    2. 北京吉泰公司, 北京 100083
  • 收稿日期:2009-01-10 修回日期:2009-03-15 出版日期:2009-09-25 发布日期:2010-05-21
  • 作者简介:付晓飞,男,1973年2月生,2007年获中国石油勘探开发研究院博士学位,现为大庆石油学院副教授,主要从事断层、封闭性及流体运移方面的研究工作.E-mail:fuxiaofei2008@sohu.com
  • 基金资助:
    中国石油风险创新基金项目“三肇凹陷多边断层成因机制及对油成藏控制作用研究”(07-06D-01-04-01-06)资助

Lateral sealing of faults for shallow biogas in Heidimiao Formation of the southern Daqing placanticline

FU Xiaofei1, PAN Guoqiang1, HE Xiangyang2, XUAN Changji1, Lü Yajuan1   

  1. 1. College of Geosciences, Daqing Petroleum Institute, Daqing 163318, China;
    2. Beijing Jitai Company, Beijing 100083, China
  • Received:2009-01-10 Revised:2009-03-15 Online:2009-09-25 Published:2010-05-21

摘要: 在大庆长垣南部黑帝庙油层中发现了大量的生物气,大部分聚集在断层圈闭中,断层侧向封闭性影响浅层气的聚集规模.黑帝庙油层具有埋藏浅、成岩程度低、砂岩物性普遍较好的特点,因此断裂变形形成的碎裂岩难以形成较强的封闭.对含气圈闭断层SGR统计表明:长垣南部断层封闭SGR临界值为0.375,对应的风险断距普遍小于50m,因此断距小于50m的断层侧向封闭性可能相对较差;同时证实层状硅酸盐-框架断层岩在该区不起封闭作用,主要封闭类型应该是对接封闭和泥岩涂抹封闭.利用Knipe图解和Allan图,结合断距-距离曲线对全区断层进行定量评价,断层封闭具有垂向的差异性和平面的分段性,因此有些圈闭只在个别小层中存在.据圈闭的断层封闭分段性分析,与未评价断层侧向封闭性之前相比,本区圈闭存在3种变化:①断层侧向封闭,幅度和面积不变的圈闭;②断层侧向部分封闭,幅度和面积变小的圈闭;③断层侧向不封闭,不存在的圈闭.其中前两种圈闭是首钻的目标,结合生物气成藏条件,认为长垣南部黑帝庙浅层生物气潜力巨大.

关键词: 大庆长垣南部, 黑帝庙油层, 断层侧向封闭性, Knipe图解, Allan图解, 定量评价

Abstract: Abundant biogas was found in Heidimiao Formation of the southern Daqing placanticline.Most gas accumulated in fault trap.The lateral sealing of faults controlled the accumulation of shallow gas.The fragmented rock resulted from the deformation of faults was difficult to bear strong sealing because of shallow burying,low diagenetic grade and good physical property.According to the SGR values of fault in the gas-bearing trap,the minimum SGR value of fault sealing is 0.375,and the corresponding risk fault throw is less than 50 m.The lateral sealing of the fault with the throw less than 50 m is worse,and the layer silicate-fault rock in this area has no sealing action on the faults.The main sealing types are interface sealing and mudstone smear sealing.The sealing of faults are evaluated quantitatively by the curves of fault throw-distance using the Knipe and Allen maps,the result shows that there are differences in the vertical sealing and segmentation in the plane,so some traps only exist in a certain small formation.The risk of trap were analyzed according to segmentation of faults,there are three kinds of changes compared with the non-evaluated lateral sealing of faults,including the good lateral sealing and traps with constant amplitude and area,the partial lateral sealing and traps with reduced amplitude and area,the non-existing traps without lateral sealing.The main drilling targets should be focused on the first and second kinds of traps.The analyses on the biogas accumulation condition show that there is a potential capacity of biogas in Heidimiao Formation of the southern Daqing placanticline.

Key words: southern Daqing placanticline, Heidimiao reservoir, fault lateral sealing, Knipe map, Allan map, quantitative evaluation

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