伊拉克中部白垩系油藏油源及运移特征

杜洋; 崔燚; 郑丹; 汪娟; 辛军; 王自明; 王海峰; 黄婷婷

doi:10.11781/sysydz201601076

伊拉克中部白垩系油藏油源及运移特征

doi: 10.11781/sysydz201601076

杜洋^1,2,
崔燚³,
郑丹²,
汪娟²,
辛军²,
王自明²,
王海峰²,
黄婷婷²

1.
西南石油大学地球科学与技术学院, 成都 610000
2. 川庆钻探工程公司地质勘探开发研究院, 成都 610051
3. 中油国际伊拉克分公司, 阿联酋迪拜 999041

基金项目: 中国石油天然气集团公司重大科技专项"中东地区碳酸盐岩油藏整体优化部署及提高采收率技术研究与应用"(11.2011E-2501.X.01)资助。

详细信息

作者简介:
杜洋(1984-),男,博士研究生,工程师,从事中东地区碳酸盐岩储层地质及油气成藏方面研究。E-mail:157762166@qq.com。

中图分类号: TE122.1
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- 被引次数: 7
出版历程
- 收稿日期: 2015-02-02
- 修回日期: 2015-12-08
- 刊出日期: 2016-01-28

Oil sources and migration characteristics of Cretaceous reservoirs in the Central Iraq

1.
Southwest Petroleum University, Chengdu, Sichuan 610000, China
2. Geology and Exploration Research Institute of CCDC, CNPC, Chengdu, Sichuan 610500, China
3. Iraq Branch Company, CNPC, Dubai 999041, UAE

摘要

摘要: 针对伊拉克中部Ahdeb油田白垩系油藏油源不清、油藏特征不明问题,以原油地化分析数据、三维地震解释、包裹体地化分析等作为研究对象,对其油源及运移特征进行分析。研究表明Ahdeb油田白垩系油藏烃类流体均形成于还原-强还原、相对闭塞海相有机质沉积,生物标志物特征对比表明,各油藏油源一致。结合伊拉克地区源岩地化特征对比分析,源岩应为上侏罗统Chia Gara组。运移以垂向为主,通道为受基底Najiad断裂控制形成的南西-北东向开启性走滑断裂,主要向断裂终点上白垩统Khasib组发生垂向运移,运移中遇横向发育高孔渗储层发生侧向运移,为次运移方向。Chia Gara源岩自白垩纪晚期开始排烃,整体可划分为2期运移:第一期发生于晚白垩世-新近纪,流体为低熟源岩排出的重质油,此时圈闭未形成,原油进入Khasib层后沿高孔渗地层向盆缘做大规模运移;第二期为新近纪后扎格罗斯造山运动使地层埋深迅速增加,源岩进入高成熟期排出的相对高成熟原油,随圈闭形成而聚集成藏。
- 油源分析 /
- 运移特征 /
- 白垩系油藏 /
- Ahdeb油田 /
- 伊拉克中部
Abstract: Crude oil geochemical data, 3D seismic interpretation, and inclusion analyses were used to examinesource rocks and migration characteristics of the Ahdeb Oil Field in central Iraq.The results indicate that oils in the Cretaceous reservoirs in the Ahdeb Oil Field all originated from reducing and strongly reducing conditions in relatively closed marine deposits. Biomarkers showed that the Cretaceous reservoirs mainly were sourced from the Upper Jurassic Chia Gara Formation. Oil mainly migrated vertically into the Upper Cretaceous Khasib Formation through the SW-NE oriented strike-slip open faults which were controlled by the Najiad fault system. Lateral migration also took place when oils intersected high-porosity and high-permeability reservoirs (Rumaila, Mishrif and Mauddud). The Chia Gara Formation began to expel oil at the end of the Cretaceous. There were two stages of oil migration. The first one took place from the late Cretaceous to Neogene. Traps were not formed yet, and the heavy oils from low maturity source rocks migrated vertically into the Khasib Formation and laterally to the basin fringe along high-porosity and high-permeability formations. The second migration stage was since the Neogene. Due to the Zagros orogeny, source rocks entered the high maturity stage by rapid subsidence, and expelleda mass of high maturity crude oils, which accumulated after trap formation.
- oil source analysis /
- migration characteristics /
- Cretaceous reservoirs /
- Ahdeb Oil Field /
- central Iraq

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