深盆气形成机理与成藏阶段划分&mdash;&mdash;以鄂尔多斯盆地为例

王传刚, 高莉, 许化政, 尹伟, 陈新军, 刘春燕, 李松

doi:10.11764/j.issn.1672-1926.2011.01.15

天然气地球科学 >

2011 , Vol. 22 >Issue 1: 15 - 22

DOI: https://doi.org/10.11764/j.issn.1672-1926.2011.01.15

非常规天然气

深盆气形成机理与成藏阶段划分——以鄂尔多斯盆地为例

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1.中国石油化工股份有限公司石油勘探开发研究院,北京 100083；
2.中国石化集团华北石油局,河南郑州 712000

王传刚(1970-),男,山东莒县人,博士,主要从事石油地质综合研究.

收稿日期: 2010-03-20

修回日期: 2010-05-29

网络出版日期: 2011-02-10

基金资助

国家重大专项(编号:2008ZX05002);中国石化科技研发项目(编号:P09014)联合资助

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Forming Mechanism and Evolution Stages Division of Deep Basin Gas Accumulation：Taking Ordos Basin as an Example

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1.Exploration & Production Research Institute,SINOPEC,Beijing 100083,China；
2. SINOPEC Huabei Oilfield Company,Zhengzhou 712000,China

Received date: 2010-03-20

Revised date: 2010-05-29

Online published: 2011-02-10

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摘要

上古生界煤系是鄂尔多斯盆地深盆气形成的基础,煤层在埋藏初期排出大量有机酸,有机酸溶解铝硅酸盐矿物,使岩石变松软、易于压实,以及地层水中Al³⁺和Si²⁺的有机络合物随温度升高分解形成SiO₂沉淀,造成煤系砂岩的区域致密化。晚侏罗世—早白垩世,随埋深加大和构造热事件的发生,鄂尔多斯盆地上古生界煤层在由贫煤向无烟煤的演化过程中,大量生成天然气并逐渐稀释、扩散和溶解汽化的地层水,形成只见气而不见水的深盆气。晚白垩世—古新世,鄂尔多斯地区的不均衡抬升剥蚀和东北高西南低大型单斜构造的形成,使二叠系煤层埋藏变浅,地温梯度降低,大量天然气散失,深盆气边界萎缩,“气舱”内水蒸气凝析成水和凝析水在重力作用下重新聚集成“酸点”,并出现气水倒置、负压异常等一系列变化。

关键词： 鄂尔多斯盆地; 上古生界煤系; 深盆气; 气水倒置; 负压异常

本文引用格式

王传刚, 高莉, 许化政, 尹伟, 陈新军, 刘春燕, 李松 . 深盆气形成机理与成藏阶段划分——以鄂尔多斯盆地为例[J]. 天然气地球科学, 2011 , 22(1) : 15 -22 . DOI: 10.11764/j.issn.1672-1926.2011.01.15

Abstract

Coal-bearing series,which expel bulk of organic acid during early burial stages is the base of deep basin gas accumulation. Organic acid would dissolve aluminum silicate minerals and cause rocks loosen and easy to be compacted. Furthermore,with the increasing of temperature,organic complex with Al³⁺ and Si²⁺ in from formation water decomposes into silica sediments causing high density of regional coal series sandstones. With the increasing of buried depth from late Jurassic to early Cretaceous,accompanied with the thermal event and the conversion procedure from lean coal to anthracite,mass gas gradually diluted,diffused,and dissolved formation water,and ultimately froming deep basin gas accumulation. Disproportion ablation and the formation of the massive southwestward monocline from late Cretaceous to Palaeocene Epoch caused the shallow buried depth of Permian coal series and the geothermal gradient decline. Deep basin gas borderline decreases because of the dissipation of bulk gas. Water vapour in “gas bin” recondensated to water and condensate water,named “acid point”,which present gas/water inversion and abnormal pressure features.

Key words： Ordos basin; Neopaleozoic coal-bearing series; Deep basin gas; Gas; water inversion; Underbalance abnormal.

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