西南石油大学学报(自然科学版)

• 地质勘探 • 上一篇    下一篇

准噶尔盆地下侏罗统页岩气形成条件

高劲*,曹喆   

  1. 中国石油大学(北京)地球科学学院,北京昌平102249
  • 出版日期:2016-02-01 发布日期:2016-02-01
  • 通讯作者: 高劲,E-mail:rongaojin@126.com

Shale Gas Accumulation Conditions of Lower Jurassic in Junggar Basin

GAO Jin*, CAO Zhe   

  1. College of Geosciences,China University of Petroleum(Beijing),Changping,Beijing 102249,China
  • Online:2016-02-01 Published:2016-02-01

摘要:

准噶尔盆地是中国西部的大型含油气盆地之一,沉积了多套烃源岩层,其中,侏罗系是盆地最重要的气源岩,
蕴含巨大的页岩气资源。通过钻井、录井、露头、岩芯资料及样品分析结果,从泥页岩的展布及埋藏条件、有机地球化
学特征、储层条件和含气特征几方面,研究下侏罗统页岩气的形成条件并对页岩气有利的勘探层位和区带进行了预
测。准噶尔盆地下侏罗统泥页岩广泛发育,以盆地西北缘及南缘沉积厚度最大;埋藏深度1 000~9 000 m,整体上具有
自北向南逐渐增加趋势;泥页岩有机碳含量较高,有机质类型以III 和II2 为主,具有倾气特征,有机质演化处于未成
熟高成熟阶段。泥页岩储层具有孔隙度低、黏土含量高的特点,储集空间以微裂缝为主。实验测得下侏罗统泥页岩
平均吸附含气量为1.42 m3/t。泥页岩段气测显示活跃,通过现场解吸试验证实了泥页岩中有天然气赋存。综合对比研
究认为,准噶尔盆地下侏罗统八道湾组为页岩气最有利的勘探层位,达巴松中拐地区为页岩气勘探最有利目标区。

关键词: 页岩气, 形成条件, 下侏罗统, 有利区, 准噶尔盆地

Abstract:

Junggar basin is a large petroliferous basin in western China,in which there has deposited several hydrocarbon source
rocks. Jurassic,one of the most significant gas sources,is considered to contain a huge potential of shale gas resources. Based
on drilling data,logging data,outcrop data,core data and laboratory test results of rock samples,we analyzed the shale gas
accumulation conditions through the distribution of dark shale and burial depth,organic geochemical characteristics,reservoir
conditions and gas-bearing features of lower Jurassic and predicted favorable formation and zone for shale gas exploration. Shale
interval of lower Jurassic is widely distributed. In the northwestern margin and southern margin,the dark shale is thickest. The
burial depth of lower Jurassic shale tends to deepen from north to south with a range between 1 000 m to greater than 4 500 m.
The organic carbon content is relatively high,and the main type of organic matter is III and II2,which is gas-prone. The thermal
maturity of Lower Jurassic shale is from immature to high mature. The shale reservoir is characterized by low porosity,high
clay minerals content and micro fracture for storage. The measured absorbed gas content is averaging 1.42 m3/t,the gas logging
show of dark shale is active. In addition,the in situ gas desorption test identified the existence of nature gas in lower Jurassic
shale. As a result,Lower Jurassic Badaowan shale is the favorable Formation,Shawan Dabasong region is the favorable zone
for shale gas accumulation.

Key words: shale gas, accumulation conditions, lower Jurassic, favorable zone, Junggar Basin

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