川中广安地区须家河组煤系烃源岩生气特征

J4 ›› 2010, Vol. 40 ›› Issue (2): 273-278.

川中广安地区须家河组煤系烃源岩生气特征

李吉君¹|崔会英^{2, 3}|卢双舫¹|薛海涛¹|胡国艺⁴|谢增业²

1.大庆石油学院地球科学学院|黑龙江大庆子163318;2.中国石油勘探开发研究院廊坊分院|河北廊坊 065007;3.中国石油天然气集团公司天然气成藏与开发重点实验室|河北廊坊 065007;4.中国石油勘探开发研究院石油地质实验研究中心|北京 100083[

收稿日期:2009-08-24 出版日期:2010-03-26 发布日期:2010-03-26
作者简介:李吉君(1981-)|男|山东泰安人|博士|讲师|主要从事油气地质与油气地球化学方面研究|E-mail:ljjdqpi@yahoo.com.cn
基金资助:
国家科技重大专项（2008ZX05007）

Generation Characteristics of Natural Gas from the Coal Measures in Guang’an Area of Central Sichuan Basin

LI Ji-jun¹, CUI Hui-ying², LU Shuang-fang¹, XUE Hai-tao¹, HU Guo-yi², XIE Zeng-ye²

1.College of Earth Sciences, Daqing Petroleum Institute, Daqing,Heilongjiang 163318, China;
2.Langfang Branch of PetroChina Exploration and Development Research Institute, Langfang,Hebei 065007, China;3.PetroChina Key Laboratory for Natural Gas Accumulation and Development, Langfang,Hebei 065007, China;4.Experimental Center of Petroleum Geology, PetroChina Exploration and Development Research Institute, Beijing 100083, China

Received:2009-08-24 Online:2010-03-26 Published:2010-03-26

摘要/Abstract

摘要：

川中广安气田天然气地质储量丰富，而源岩发育有限。为对其形成机理进行探讨，利用MSSV热解实验和化学动力学方法对广安地区须家河组煤系烃源岩的生气特征进行了研究。结果表明:广安地区须家河组煤系烃源岩生气主要集中在晚侏罗世（156.6~140 Ma），具有短期内大量生气的特点，生气量为（0.89~1.86）×10¹² m³，天然气运聚效率为7.26%以上，生气强度为（3.35~11.83）×10⁸ m³/km²，低于我国大气田通常的生气强度（>20×10⁸ m³/km²）。天然气的高效运聚是广安气田在生气强度较低情况下仍能形成大气田的基础；除前人总结因素外，须家河组煤系烃源岩短期内大量生气的特点是造成该区天然气高效运聚的一个重要原因。在运聚条件优越的情况下，形成大气田所需要的烃源岩条件可适当放宽。

关键词: 川中, 广安气田, 须家河组, 煤系烃源岩, 生气特征, 石油地质学

Abstract:

Guang’an gas field, a gas field in the central Sichuan basin, has a very considerable geological reserve of natural gas from the Xujiahe Formation coal measures which is not very perfect. In order to give the reason, the generation characteristics of natural gas from the Xujiahe Formation coal measures in the Guang’an area was studied by means of the MSSV pyrolysis experiment and chemical kinetic method. The result indicates that natural gas was mainly generated during the MiddleLate Jurassic (156.6-140 Ma), a relative short period. The total amount of gas generation is 0.89×10¹²-1.86×10¹² m³ and more than 7.26% gas was accumulated. The gas generation intensity is 3.35×10⁸-11.83×10⁸m³/km² which is lower than the usual value (>20×10⁸ m³/km²) for a great gas field. It is the efficient accumulation of natural gas that results in the formation of a great gas field with a relative low gas generation intensity in Guang’an area. Besides the presummarized factors, the generation of amount gas in a short period is an important reason resulting in the efficient accumulation of natural gas in Guang’an area. With a superior accumulation condition, the threshold of source rock for forming a great gas field can be lowered properly.

Key words: central Sichuan basin, Guang’an gas field, Xujiahe Formation, coal measures, gas generation characteristics, petroleum geology

中图分类号:

P618.13

李吉君, 崔会英, 卢双舫, 薛海涛, 胡国艺, 谢增业. 川中广安地区须家河组煤系烃源岩生气特征[J]. J4, 2010, 40(2): 273-278.

LI Ji-jun, CUI Hui-yang, LEI Shuang-fang, XUE Hai-tao, HU Guo-yi, XIE Zeng-ye. Generation Characteristics of Natural Gas from the Coal Measures in Guang’an Area of Central Sichuan Basin[J]. J4, 2010, 40(2): 273-278.

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