阳霞凹陷超压成因及与油气成藏关系

石万忠; 陈红汉; 张希明; 陈惠超

阳霞凹陷超压成因及与油气成藏关系

1.
中石化西北石油局研究院, 湖北武汉 430074
2.
中石化西北石油局研究院, 新疆乌鲁木齐 830011

基金项目:

国家自然科学基金项目 40372068

详细信息

作者简介:
石万忠(1973 -), 男, 2000 年毕业于中国地质大学(武汉)研究生院, 获硕士学位, 现在中国地质大学(武汉)石油系任教, 博士在读. 主要从事层序地层学研究.

中图分类号: P618
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出版历程
- 收稿日期: 2004-07-23
- 刊出日期: 2005-03-25

Origin of Overpressure and Relation with Oil & Gas Pool-Forming in Yangxia Sag

1.
Faculty of Earth Resources, China Univer sity of Geosciences, Wuhan 430074, China
2.
Acad emy of Design & Research, Northwest Bureau of Petroleum, SINOPEC, Urumchi 830011, China

摘要

摘要: 地层超压的形成和分布不仅与油气的运聚成藏有关, 而且还直接影响油气钻井工程.因此, 超压的研究和预测成为当今含油气盆地研究中的重要内容.阳霞凹陷属于库车坳陷的一个次级构造单元, 钻井揭示凹陷内有超压发育.笔者应用测井资料、测试资料和地震资料分析了阳霞凹陷内超压的成因以及超压与油气成藏的关系, 得出以下认识: (1) 在阳霞凹陷内, 上第三系吉迪克组膏泥岩中的超压是以欠压实成因为主控因素, 下第三系和白垩系中的超压是以构造成因为主控因素, 形成了上下两套成因机制并不完全相同的超压系统. (2) 从构造演化时间上来看, 巴西盖组与巴什基奇克组的超压形成时间最晚在上新世的库车组时期, 早于油气大规模运移时期(库车晚期—第四纪西域期).由于缺少断层的疏导, 积聚的超压无法通过断层释放, 阻挡了后期油气在巴西盖组与巴什基奇克组中聚集成藏, 使得库1井所钻遇的圈闭成藏规模不足.
- 超压 /
- 超压成因 /
- 油气成藏 /
- 阳霞凹陷 /
- 库车坳陷
Abstract: The origin and distribution of formation overpressure has an effect not only on hydrocarbon migration and accumulation, but also on drilling well technique. The study and prediction of overpressure is very important in basin study. (Yangxia) sag is a sub-tectonic unit in Kuqa depression. Drilling shows overpressure is very common in Yangxia sag. Using logs, test materials and seismic data, this paper analyzes the origin of overpressure and its influence on oil and gas pool-forming.Resultsshow that: (1) Overpressure in Jidike Formation is mainly developed by deposition, and overpressure in Cretaceous by tectonic stress. These two overpressure systems are completely different in origin. (2) The overpressure in the Baxigai and Bashijiqike formations formed in the Pliocene when the Kuqa Formation was deposited, that is earlier than the Kuqa-Xiyu period when oil and gas migrated on a large scale. The overpressure cannot be released by the faults because there are faults around the Ku1 well area, which resisted oil and gas entering the reservoir and influenced pool-forming.
- overpressure /
- origin of overpressure /
- pool-forming /
- Yangxia sag /
- Kuqa depression

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图 1 库车凹陷构造单元

Fig. 1. Tectonic units in Kuqa depression

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图 2 阳霞凹陷库1井地层压力剖面图

Fig. 2. Geopressure chart of Ku1 well in Yangxia sag

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图 3 库1井泥岩声波与泥岩电阻率变化

1.舒善河组(K₁s); 2.巴西盖组(K₁b); 3.巴什基奇克组(K₁bs); 4.库姆格列木群(E_1-2km); 5.苏维依组(E₃s); 6.吉迪克组(N₁j); 7.康村组(N₁k); 8.库车组(N₂k)

Fig. 3. Log of mudstone sonic and RILD in Yangxia sag, Kuqa depression

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图 4 库1井埋藏史

Fig. 4. Burial history of Ku1 wel 1 in Kuqa depression

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图 5 库车坳陷构造带剩余压力对比

Fig. 5. Residual pressure in tectonic belts, Kuqa depression

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图 6 库车凹陷白垩系实测最高剩余压力平面图

1.钻井; 2.构造单元边界; 3.剩余压力(单位MPa); Ⅰ.克—依构造带; Ⅱ.拜城凹陷; Ⅲ.阳霞凹陷; Ⅳ.秋立塔克背斜带; Ⅴ.南部平缓背斜带; Ⅵ.雅克拉—轮台区块

Fig. 6. Maximum residual pressure map of Cretaceous in Kuqa depression

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图 7 亚肯构造三维地震测线Line917地震解释剖面图

Fig. 7. Seismic interpretation profile of Line917 in Yaken tectonic belts, Kuqa depression

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图 8 库车坳陷流体势分布特征

1.钻井; 2.流体势能线(单位: m²/s²)

Fig. 8. Fluid potential energy characteristics in Kuqa depression

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