马更些三角洲冻土区天然气水合物成藏的地质控制因素

刘  杰; 孙美静; 杨  睿; 苏  明; 杨楚鹏

doi:10.3969/j.issn.2095-560X.2018.01.008

新能源进展 >

2018 , Vol. 6 >Issue 1: 47 - 54

DOI: https://doi.org/10.3969/j.issn.2095-560X.2018.01.008

论文

马更些三角洲冻土区天然气水合物成藏的地质控制因素

刘杰 ,
孙美静 ,
杨睿 ,
苏明 ,
杨楚鹏

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1. 中国科学院广州能源研究所，广州 510640；
2. 中国科学院天然气水合物重点实验室，广州 510640；
3. 广州海洋地质调查局，广州 510750；
4. 中山大学海洋科学学院，广州 510640

刘杰（1986-），男，硕士，助理研究员，从事海域天然气水合物成藏地质条件分析方面的科研工作。

收稿日期: 2017-06-20

修回日期: 2017-12-26

网络出版日期: 2018-02-28

基金资助

广州市珠江科技新星项目（201710010198）；
中国科学院天然气水合物重点实验室基金项目（Y707jd1001）；
中国石油–中国科学院科技合作项目（2015A-4813）；
国土资源部专项项目（DD20160214）

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Geologic Controls on Permafrost-Associated Gas Hydrate Occurrence in the Mackenzie Delta

LIU Jie ,
SUN Mei-jing ,
YANG Rui ,
SU Ming ,
YANG Chu-peng

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1. Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China;
2. CAS Key Laboratory of Gas Hydrate, Guangzhou 510640, China;
3. Guangzhou Marine Geological Survey, Guangzhou 510750, China;
4. School of marine sciences, Sun Yat-sen University, Guangzhou 510640, China

Received date: 2017-06-20

Revised date: 2017-12-26

Online published: 2018-02-28

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摘要

本文系统归纳了马更些三角洲冻土区天然气水合物赋存的稳定条件、分布特征和水合物成藏特征，指出构造条件、沉积条件和水动力场在天然气水合物富集过程中起到的重要作用。马更些冻土区天然气水合物主要气体来源为热成因气，空间非均质分布特征明显，且与传统油气资源共生成藏。在冻土带底部温度和压力视为均一条件下，可为深部气源提供运移通道的区域主断层等构造条件是天然气水合物聚集成藏的控制因素。储层非均质性影响天然气水合物的空间分布，粗粒沉积是高饱和度水合物富集的有利场所；同时，冻土层在水合物成藏中起到“封盖作用”，良好的“储盖组合”有利于水合物富集成藏。此外，深部超压流体系统和浅层重力流系统两大水动力场也是影响该地区天然气运移和水合物赋存与分布的重要地质因素。

关键词： 马更些冻土区; 天然气水合物; 非均质性; 共生成藏; 控制因素

本文引用格式

刘杰 , 孙美静 , 杨睿 , 苏明 , 杨楚鹏 . 马更些三角洲冻土区天然气水合物成藏的地质控制因素[J]. 新能源进展, 2018 , 6(1) : 47 -54 . DOI: 10.3969/j.issn.2095-560X.2018.01.008

Abstract

The stable condition, distribution and hydrocarbon accumulation characteristics of natural gas hydrate in the Mackenzie Delta area were systemically summarized. The structural condition, sedimentary condition and hydrodynamic field play important roles in the enrichment process of gas hydrate. Permafrost-associated gas hydrate shows characteristics as follows: heterogeneous distribution, gas source from thermogenic gas and coexistence with conventional oil resources in the Mackenzie Delta. Under conditions of temperature and pressure are considered to be uniformed in the bottom of permafrost, the gas hydrate occurrence in the study area is principally controlled by regional main faults, which can offer fluid channel for deep gas source. Coarse clastic sediment can supply favorable storage space, and is a favorable place for the enrichment of high saturation hydrate. Moreover, the permafrost plays a sealing role in hydrate accumulation, good reservoir-cap assemblages are favorable for hydrate accumulation. Besides, the deep overpressure fluid system and shallow gravity flow system are also important factors that influence the migration of natural gas and the occurrence and distribution of hydrate in this area.

Key words： Mackenzie permafrost; gas hydrate; heterogeneity; coexistence relationship; controlling factor

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