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川东高陡构造带岩性封隔不对称气水分布模式
The lithologically sealed gas-water asymmetric distribution model of high-steep structural belt in East Sichuan Basin
刘 勇1,2 杨洪志1,2 马智超1,2 张 春1,2 王 容1,2 阮明龙1,2 别
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DOI:10.12055/gaskk.issn.1673-3177.2017.03.001
作者单位:1. 中国石油西南油气田公司勘探开发研究院 2. 国家能源高含硫气藏开采研发中心 3. 中国石油西南油气田公司输气处工艺研究所 4. 中国石油西南油气田分公司川东北气矿
中文关键字:四川盆地 川东高陡构造带 石炭纪 岩性封隔 地质单元 不对称气水分布 水体能量 排水效果
英文关键字: Sichuan Basin; High-steep structural belt in East Sichuan Basin; Carboniferous; Lithologic sealing; Geologic unit; Gas-water asymmetric distribution; Water energy; Water drainage effect
中文摘要:




    在多期构造运动的影响下,四川盆地川东地区形成了成排成带高陡构造,区带构造幅度高,气水分彻底,气藏气水赋存模式多为构造控制的边水赋存模式。川东地区石炭系气藏开发实践中,发现沿剥蚀线周缘及断层活动区,受后期成藏的影响,在高陡构造气藏中存在不对称气水分布模式,同一气藏内部具有多个不同气水界面,且各区水体表现出产水特征不同。综合利用动静态资料分析确定该气水分布模式分布特征,提出了川东高陡构造带岩性封隔不对称气水分布模式新概念。研究认为:该模式的形成具有2个条件:一是具有(构造)岩性封堵条件,二是具有充足的供烃和排水能力,且后期烃类充注能力较强;在不对称的气水分布区,水体的分布范围、水侵能量大小均有差异,不同气水分布区水体活跃程度不同:相对局限区水体能量受限,对气井影响程度低;相对开阔区域水体能量较大,对气井影响程度高。该认识为气藏开发技术对策调整和提高采收率提供理论依据,进一步丰富了高陡构造带气藏气水模式认识,对有水气藏描述及评价具有重要借鉴意义。



英文摘要:As a result of multi-stage tectonic movements, many rows of high-steep structural belts are developed in East Sichuan Basin. These structural belts are characterized by high structural amplitude and thorough gas-water differentiation. The water in gas reservoirs mainly exists in the form of structure-controlled edge water. It is demonstrated in the development practice of Carboniferous gas reservoirs in East Sichuan Basin that, along denudation line and in active fault areas, an asymmetric gas-water distribution model is found in high-steep structural gas reservoirs due to the effect of later hydrocarbon accumulation process. There are a number of different gas-water contacts in the same gas reservoir, and water production characteristics of aquifers in different areas are different. In this paper, the characteristics of this gas-water distribution model were analyzed and confirmed by using dynamic and static data comprehensively, and then a new concept of lithologically sealed gas-water asymmetric distribution model was put forward for the high-steep structural belt in East Sichuan Basin. According to the study results, this model was formed under two conditions, i.e., (tectonic) lithologic sealing, and sufficient hydrocarbon supply and water drainage capacity, as well as stronger hydrocarbon charging capacity in the later stage. In gas-water asymmetric distribution areas, the water distribution range and water invasion energy are different. The activity of water is different depending on gas-water distribution areas. In restricted areas, the water energy is limited, having less effect on gas wells. In open areas, the water energy is high, having more effect on gas wells. The study results provide the theoretical basis for development strategy adjustment and recovery enhancement of gas reservoirs, and further understanding on gas-water distribution models of high-steep structural belts, contributing greatly to the description and evaluation of gas reservoirs with water.
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国内统一连续出版物号:CN51-1159/TE |国内发行代码: |国际标准出版物号:ISSN1673-3177 |国际发行代码:
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