地学前缘 ›› 2012, Vol. 19 ›› Issue (5): 348-355.

• 论文 • 上一篇    下一篇

辽河东部地区页岩气成藏地质条件

毛俊莉,李晓光,单衍胜,汪百齐,荆铁亚,黄双泉,朱亮亮,葛明娜   

  1. 1. 中国石油 辽河油田勘探开发研究院, 辽宁 盘锦 124010
    2. 中国地质大学(北京), 北京 100083
  • 收稿日期:2012-03-15 修回日期:2012-09-04 出版日期:2012-09-10 发布日期:2012-09-10
  • 作者简介:毛俊莉(1971—),女,博士,高级工程师,从事油气勘探研究工作。E-mail:maojunli1971@sina.com
  • 基金资助:

    国土资源部全国油气资源战略选区调查与评价专项(2009GYXQ15)

Shale gas accumulation conditions of Eastern Region of Liaohe Depression.

  1. 1. Exploration and Development Institute of Liaohe Oilfield, PetroChina, Panjin 124010, China
    2. China University of Geosciences (Beijing), Beijing 100083, China
  • Received:2012-03-15 Revised:2012-09-04 Online:2012-09-10 Published:2012-09-10

摘要:

页岩气主要是以吸附相和游离相同时赋存于泥岩及其夹层中的天然气。辽河东部地区包括东部凹陷和东部凸起,历经基底和陆块形成阶段、地台发育阶段、裂谷发育阶段和坳陷发育阶段,是一个典型的改造型的叠合盆地。辽东地区发育多套烃源岩,它们各自具有独立性。这些烃源岩不仅为常规油气藏提供物质基础,也是页岩气成藏及勘探的主要对象。综合分析可知,东部地区有3 套页岩具备页岩气成藏条件,生烃条件优越,页岩厚度大,有机质丰度高。泥岩储集性能良好,微孔、微裂缝发育,脆性矿物含量较高,利于后期压裂改造。对储层含气性进行测试可知,古近系中的页岩气以游离态为主,东部凸起则以吸附态为主;因此东部凸起古生界页岩气对构造保存条件要求相对低。东部凹陷古近系热演化程度低,页岩气以游离态为主,且页岩油气共生,保存条件较好。对东部地区进行优选可知: 中生界3井区,东部凹陷青龙台地区、桃园、黄于热地区是页岩气勘探有利区;东部凸起佟3井区、王参1井南部井区是近期页岩气勘探的首选地区。

关键词: 页岩气, 成藏条件, 勘探前景;辽河东部地区

Abstract:

 Shale gas is the natural gas existing in mudstone/shale or their interlayers, being adsorbed or free. The Eastern Region of Liaohe Depression consists of the Eastern Sag and Eastern Uplift and it is a typical transformation superimposed basin which had undergone the stages of the base and land mass formation, of the floor development, of the rift development and of the depression development. The Eastern Region is not only rich in conventional oil and gas but also in unconventional oil and gas because of having deposited multiple sets of hydrocarbon source rocks. Now, to some extent, it has made some important progress in the exploration of shale gas. Basically, the three main sets of shale formations in the Eastern Region of Liaohe Depression meet the demands of shale gas accumulation: favorable conditions of hydrocarbon generation, a certain thickness, and abundance of organic matter. Shale in the Eastern Region of Liaohe Depression has favorable conditions of gas accumulation, and at the same time, a huge number of micropores and microfractures and high fragile mineral content make it conducive to the postfracturing. By studying and analyzing a large number of data, the shale gas in the Paleogene is mainly composed of free gas, while adsorbed gas accounts for a large amount of shale gas in Eastern Uplift whose condition of structure preservation can be slightly loose. The Eastern Sag has lower maturity and better preservation conditions in the Paleogene and free gas accounts for more in its shale; meanwhile, there are shale gas and shale oil symbiosis in shale formations. There are some favorable areas for shale gas exploration, such as Well Jie3 area, Qinglongtai area, Taoyuan area, Huangyure area in the Eastern Region, and Well Tong3, south of Well Wangcan1 are good choice for shale gas exploration currently.

Key words: shale gas, shale gas accumulation conditions, prospective, Eastern Region of Liaohe Depression

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