石油与天然气地质 ›› 2015, Vol. 36 ›› Issue (3): 370-377.doi: 10.11743/ogg20150304

• 油气地质 • 上一篇    下一篇

方正断陷不同成因天然气地球化学特征及成藏模式

柳波1,2, 陆军1,2, 吕延防1, 付广1, 王世辉3, 金玮3   

  1. 1. 东北石油大学 非常规油气成藏与开发省部共建国家重点实验室培育基地, 黑龙江 大庆 163318;
    2. 黑龙江省高等学校科技创新团队"断裂变形、封闭性及与流体运移", 黑龙江 大庆 163318;
    3. 中国石油 大庆油田有限公司 勘探开发研究院, 黑龙江 大庆 163318
  • 收稿日期:2015-01-21 出版日期:2015-06-08 发布日期:2015-07-24
  • 第一作者简介:柳波(1983—),男,博士、副教授,油气成藏地质学和非常规油气地质。E-mail:liubo6869@163.com。
  • 基金项目:
    国家自然科学基金面上项目(41472125);国家青年自然科学基金项目(41202101);中国博士后科学基金面上资助项目(2013M541338);黑龙江省教育厅科学技术研究项目(12541084);黑龙江省青年科学基金项目(QC2015043);黑龙江省普通本科高等学校青年创新人才培养计划(UNPYSCT-2015077)。

Geochemical characteristics and accumulation models of different genetic types of natural gas in the Fangzheng Fault Depression

Liu Bo1,2, Lu Jun1,2, Lyu Yanfang1, Fu Guang1, Wang Shihui3, Jin Wei3   

  1. 1. Accumulation and Development of Unconventional Oil and Gas, State Key Laboratory Cultivation Base Jointly-constructed by Heilongjiang Province and the Ministry of Science and Technology, Northeast Petroleum University, Daqing, Heilongjiang 163318, China;
    2. "Fault Deformation, Sealing and Fluid Migration" Science and Technology Innovation Team in Colleges and Universities of Heilongjiang, Daqing, Heilongjiang 163318, China;
    3. Exploration and Development Research Institute, Daqing Oilfield Company Limited, CNPC, Daqing, Heilongjiang 163318, China
  • Received:2015-01-21 Online:2015-06-08 Published:2015-07-24

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摘要： 方正断陷天然气成因类型复杂，查明气源对其天然气勘探具有重要意义。根据天然气组分及烷烃碳同位素特征，结合成气地质背景，对天然气的成因类型进行了分析。通过不同构造单元的烃源岩有机质类型及热演化程度差异，对比天然气热成熟度并进行气源探讨。结果表明：方正断陷天然气可以分为3类。A类天然气为干气，成因类型为催化过渡带气，为新安村组-乌云组湖相泥岩所生;B类天然气为湿气，成因类型为热成因煤型气，与腐殖型有机质生成的原油相伴生，为煤系泥岩所生;C类天然气亦为湿气，成因类型以热成因油型气为主，具有一定的腐殖型有机质生气贡献，与腐殖型有机质生成的原油相伴生，为混源气。伊汉通断裂两侧构造的差异活动是造成东、西两个次凹天然气地球化学特征及成藏模式有明显差异的最主要因素。

关键词: 天然气组分, 烷烃碳同位素, 天然气成因, 气-源对比, 方正断陷

Abstract: Because of the complicated genetic types of gas, accurate identification of the sources of the nature gas has great significance to gas exploration in the Fangzheng Fault Depression.First, the genetic types of natural gas were classified based on the gas components, alkane carbon isotopes and in combination with the actual geological conditions.Then, the thermal maturity of gas was correlated with source rocks in different tectonic units to reveal the gas sources based on identification of organic types and thermal evolution degree. The results show that the gas of this area can be divided into three types.Type A is dry gas and its genetic type is catalytic transitional zone gas generated by lacustrine mudstone in the Xin'ancun-Wuyun Formations.Type B is wet gas and its genetic type is thermal coal-related gas generated by coal measure mudstones.Type C is also wet gas and its genetic type is petroliferous gas generated partly by humic organic ma-tter.It is associated with the oil generated by humic organic matters and is of hybrid sources.Differential structural activity on two sides of Yihantong fault is the main factor leading to the different geochemical characteristics and accumulation patterns of natural gas between the east and west sags.

Key words: gas component, alkane carbon isotope, origin of natural gas, gas-source correlation, Fangzheng Fault Depression

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