鄂尔多斯盆地东部上古生界石千峰组低压气藏特征

杨华; 姬红; 李振宏; 孙六一

鄂尔多斯盆地东部上古生界石千峰组低压气藏特征

杨华^{1, 2,},
姬红¹,
李振宏¹,
孙六一¹

1.
中国石油长庆油田分公司, 陕西西安 710021
2.
成都理工大学地球科学学院, 四川成都 610059

基金项目:

国家重点基础研究发展规划“973”项目 2001CB209104-5

详细信息

作者简介:
杨华(1963-), 男, 高级工程师, 主要从事油气藏方向的研究.E-mail: yh_cq@petrochina.com.cn

中图分类号: P618.130
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出版历程
- 收稿日期: 2004-03-19
- 刊出日期: 2004-07-25

Characteristics of Underpressured Gas Pool in Upper Paleozoic Shiqianfeng Formation of Eastern Ordos Basin

1.
Changqing Oil Field Branch Company ofChina Petroleum, Xi'an 710021, China
2.
Geosciences College, Chengdu University of Technology, Chengdu 610059, China

摘要

摘要: 鄂尔多斯盆地的气源主要来自于山西组-太原组的海陆交互相煤系地层, 上石盒子组沉积了一套巨厚的泥岩, 具有很强的封盖能力, 天然气很难穿层运移.近年来, 相继在盆地东部的石千峰组地层中发现了一系列次生气藏, 其形成机理逐步引起了勘探家的关注.根据次生气藏的特点, 结合包裹体测试计算, 认为其形成原因主要是由于下部超压地层进行超压释放, 从而在区域性盖层内部形成一系列泄压通道, 原生气藏泄漏而形成的.形成过程主要经历了下部高温高压原生气藏的形成、原生气藏泄压与次生气藏的形成、次生气藏的长时间调整3个阶段.
- 鄂尔多斯盆地 /
- 原生气藏 /
- 次生气藏 /
- 超压形成 /
- 超压释放 /
- 泄压通道 /
- 油气运移
Abstract: The gas source in Ordos basin mainly comes from the alternate marine-continental coal-bearing measures of Shanxi and Taiyuan formations. The Upper Shihezi Formation with a vast thick mudstone layer can be taken as a very good seal, so it is difficult for natural gas to pass through. Recently, some secondary gas pools have been found in Shiqianfeng Formation lying above the Upper Shihezi Formation in eastern Ordos basin. In this paper, according to the properties of secondary gas pools and the inclusion data, the secondary gas pools are thought to be formed due to the leakage of the original gas pools penetrating through the regional caprock when the overpressures within lower overpressured strata release. The forming process of gas reservoirs includes three stages, that is, the formation of the primary gas pools with high temperature and high pressure, the leakage of the primary gas pools and the formation of the secondary gas pools, and late adjustment and maintenance of the secondary pools.
- Ordos basin /
- primary gas pools /
- secondary gas pools /
- overpressure /
- overpressure release /
- pressure releasing pathway /
- oil and gas migration

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图 1 鄂尔多斯盆地上古生界生气强度及含气层位

Fig. 1. Gassource intension and gas-bearing strata of Upper Paleozoic in Ordos basin

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图 2 鄂尔多斯盆地上古生界气源对比

Fig. 2. Gas source contrast of Upper Paleozoic in Ordos basin

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图 3 气藏与压力系数匹配关系

Fig. 3. Matched relationship between reservoir and pressure

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图 4 石千峰组气藏成藏模式

Fig. 4. Gas pools model of Shiqianfeng Formation

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表 1 鄂尔多斯盆地东部上古生界压力统计

Table 1. Strata pressure of Upper Paleozoic in eastern Ordos basin

表 2 鄂尔多斯盆地东部天然气组分分析

Table 2. Analysis of gas component in eastern Ordos basin

表 3 鄂尔多斯盆地东部地区包裹体形成温度压力

Table 3. Temperature and pressure of inclusion forming in eastern Ordos basin

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