The origin of formation water and the regularity of gas and water distribution for the Sulige gas field, Ordos Basin

doi:10.7623/syxb201005011

Editorial office of ACTA PETROLEI SINICA ›› 2010, Vol. 31 ›› Issue (5): 767-773.DOI: 10.7623/syxb201005011

• Petroleum Exploration • Previous Articles Next Articles

The origin of formation water and the regularity of gas and water distribution for the Sulige gas field, Ordos Basin

DOU Weitan LIU Xinshe WANG Tao

Received:2010-01-06 Revised:2010-03-18 Online:2010-09-25 Published:2010-11-30

鄂尔多斯盆地苏里格气田地层水成因及气水分布规律

窦伟坦刘新社王涛

中国石油长庆油田分公司陕西西安 710021

通讯作者: 窦伟坦
作者简介:窦伟坦，男，1963年4月生，2005年获成都理工大学博士学位，现任中国石油长庆油田分公司勘探部经理，高级工程师，长期从事勘探技术研究与管理工作。
基金资助:
国家大型油气田及煤层气开发科技重大专项（2008ZX05044）“鄂尔多斯盆地大型岩性地层油气藏勘探开发示范工程”资助。

Abstract

Abstract:

The Sulige gas field with a gas-bearing area of about 4×10⁴km² in the Ordos Basin is one of the largest gas fields discovered in China up to now. It belongs to a sandstone lithologic gas reservoir characteristics of low porosity, low permeability, low abundance, low yield but large-scale distribution. Analyses on geochemistry, occurrence attitude and origin of formation water showed that the formation water in the Sulige gas field was characterized by chloride calcium type, slight acidity, total salinity of 29.12 g/L～68.30 g/L, δ²D value of -82.7‰～-60.5‰, δ¹⁸O value of -6.3‰～-3.39‰, and ⁸⁷Sr / ⁸⁶Sr value of 0.71365～0.71718, indicating a palaeo-depositional formation water in a mutually unconnected and deeply closed environment. The distribution of the formation water was mainly controlled by the intensity of hydrocarbon generation and the heterogeneity of reservoirs rather than regional structures, and it was relatively independent, discontinuous, and lacking in a uniform gas-water interface.

Key words: Ordos Basin, Sulige gas field, lithologic gas reservoir, origin of formation water, distribution of gas and water

摘要：

鄂尔多斯盆地苏里格气田是中国目前发现的最大天然气气田，属于低孔隙、低渗透、低丰度、低产量、大面积展布的砂岩岩性气藏，含气面积达4×10⁴km²。地层水地球化学特征、地层水产状与成因分析表明，苏里格气田地层水均为CaCl₂型，呈弱酸性，总矿化度为29.12～68.30g/L，氢(δ²D) 同位素–82.7‰～–60.5‰，氧(δ¹⁸O) 同位素–6.3‰～–3.39‰，锶（⁸⁷Sr / ⁸⁶Sr）同位素0.71365～0.71718，反映了互不连通的深层封存环境的古沉积水特征。地层水分布主要受生烃强度和储层非均质性控制，不受区域构造控制，其相对独立、不连片、无统一气水界面。

关键词: 鄂尔多斯盆地, 苏里格气田, 岩性气藏, 地层水成因, 气水分布

DOU Weitan LIU Xinshe WANG Tao. The origin of formation water and the regularity of gas and water distribution for the Sulige gas field, Ordos Basin[J]. Editorial office of ACTA PETROLEI SINICA, 2010, 31(5): 767-773.

窦伟坦刘新社王涛. 鄂尔多斯盆地苏里格气田地层水成因及气水分布规律[J]. 石油学报, 2010, 31(5): 767-773.

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The origin of formation water and the regularity of gas and water distribution for the Sulige gas field, Ordos Basin

鄂尔多斯盆地苏里格气田地层水成因及气水分布规律

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