莺歌海盆地天然气成藏动力学

朱伟林; 王振峰; 黄保家

莺歌海盆地天然气成藏动力学

中海石油有限公司湛江分公司，广东湛江 524057

基金项目:

国家重点基础研究发展规划“973”项目 G2000046705

详细信息

作者简介:
朱伟林（1956－），男，博士，高级工程师，长期从事中国海域油气勘探开发研究与管理工作.E-mail：zhuwl@cnooc.com.cn

中图分类号: P618.130.2
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出版历程
- 收稿日期: 2004-06-06
- 刊出日期: 2004-09-25

Dynamics of Gas Accumulation in Yinggehai Basin

Zhanjiang Filiale, CNOOC China Ltd., Zhanjiang 524057, China

摘要

摘要: 采用地质与地球化学、宏观与微观相结合的研究方法, 探讨莺歌海盆地的成藏动力学过程, 具体表现在: 通过成藏流体非均质性剖析揭示了底辟浅层气田多源混合-幕式充注的成藏特点, 流体活动的地球物理特征和地球化学资料显示底辟断裂为深成天然气向上运移提供了良好的通道, 而异常高压是流体压裂运移的关键动力, 并驱使梅山-三亚组烃源岩生成的天然气向上运移、聚集和散失.由于中央坳陷带气源丰富, 存在供大于散的物质基础, 尤其是“幕式”集中运移具有高的排烃效率, 因此, 莺歌海盆地底辟带浅层构造在距今1.2~ 0.1Ma如此短暂的时间里天然气依然能够聚集成藏.
- 莺歌海盆地 /
- 成藏动力学 /
- 底辟构造 /
- 多源混合 /
- 幕式充注
Abstract: Based on the integrated analysis of geological and geochemical data, gas accumulation process is discussed in the Yinggehai basin by means of macro- and microapproaches. Interreservoir compositional heterogeneities in shallow gas field at diapiric structures indicate that hydrocarbon gases may undergo the processes of multiple mixing, episodic migration and accumulation. The faults at diapiric structures provide a good pathway for natural gas vertical migration from the deep source rocks into the shallow reservoirs as evidenced from high-resolution seismic images. Natural gases are derived from the Early Miocene Meishan and Middle Miocene Sanya source rocks distributed within overpressured zones. This overpressuring, together with active faulting, results in the episodic expulsion of fluids distributed within overpressured zones as a result of multiple infilling into shallow reservoir or leakage loss of hydrocarbon gases. Therefore, the short-lived rapid accumulation of hydrocarbon gases happens only about 1.2-0.1 Ma before the present time because of a plentiful of gas sources and high hydrocarbon expulsion efficiency.
- Yinggehai basin /
- hydrocarbon accumulation dynamics /
- diapiric structure /
- multiple source mixing /
- episodic injection

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图 1 莺歌海盆地区域构造

Fig. 1. Regional tectonic map of Yinggehai basin

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图 2 莺歌海盆地底辟带DF1-1-11井压力剖面

Fig. 2. Pressure section of DF1-1-11 well in diapir belt of Yinggehai basin

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图 3 LD8-1底辟构造地震剖面, 显示底辟断裂和“底辟模糊带”

Fig. 3. Seismological section of diapir structure LD8-1

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图 4 LD22-1和LD8-1气田天然气幕式成藏地化特征

Fig. 4. Geochemical features of episodic accumulation in the gas fields LD22-1 and LD8-1

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图 5 利用梅山组烃源岩(底部) 天然气生成的碳同位素动力学模型确定DF1-1气田成藏时间

Fig. 5. Determining generating hydrocarbon time of DF1-1 with the dynamics model of carbon isotope from the bottom source rocks of Meishan Formation

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图 6 莺歌海盆地天然气运移成藏模式

Fig. 6. Natural gas migration and accumulation model in Yinggehai basin

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参考文献(18)

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