莺歌海盆地与琼东南盆地成藏条件的比较及天然气勘探方向

龚再升; 杨甲明; 郝芳; 胡建武

莺歌海盆地与琼东南盆地成藏条件的比较及天然气勘探方向

1.
中国海洋石油总公司, 北京 100029
2.
中国海洋石油总公司勘探研究院, 河北高碑店 074010
3.
中国地质大学资源学院, 湖北武汉 430074

基金项目:

国家863项目 863-820-05-01

详细信息

作者简介:
龚再升(1938),男,1962年毕业于北京地质学院石油地质专业,中国海洋石油公司总地质师,主要从事含油气盆地和石油地质综合研究

中图分类号: P618.130.2
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出版历程
- 收稿日期: 2001-03-06
- 刊出日期: 2001-05-25

DIFFERENCE IN NATURAL GAS ACCUMULATION CONDITIONS BETWEEN YINGGEHAI AND QIONGDONGNAN BASINS AND ITS IMPLICATIONS FOR NATURAL GAS EXPLORATION

1.
China National Offshore Oil Corporation, Beijing 100029, China
2.
Institute of Petroleum Exploration and Development, CNOOC, Gaobeidian 074010, China
3.
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China

摘要

摘要: 莺歌海盆地和琼东南盆地常被合称为莺琼盆地, 但二者的天然气成藏条件明显不同: 莺歌海盆地第三—第四系巨厚, 老第三纪崖城组和陵水组强烈过成熟, 有效源岩为新第三纪三亚组和梅山组, 而琼东南盆地的主要源岩为崖城组和陵水组, 上第三系的生烃强度较低; 尽管莺歌海盆地和琼东南盆地均为超压盆地, 但莺歌海盆地强超压和右旋张扭应力场的共同作用导致超压囊顶部破裂并发育底辟, 实现了超压流体包括天然气的垂向集中排放, 而琼东南盆地总体上仍为侧向分散流体系统.莺歌海盆地的重要勘探领域是与底辟有关的圈闭, 而琼东南盆地的主要勘探领域应为与下第三系源岩具有良好输导通道的上第三系岩性-构造复合圈闭或下第三系构造圈闭.
- 生烃凹陷 /
- 流体流动样式 /
- 成藏条件 /
- 莺歌海盆地 /
- 琼东南盆地
Abstract: The Yinggehai and Qiongdongnan basins, often called Ying-Qiong basin, are quite different in their petroleum accumulations. The Tertiary and Quaternary sediments in the Yinggehai basin is up to 17 km thick, with the Oligocene Yacheng and Lingshui formations over-mature. Therefore, the effective source rocks are the Sanya and Meishan formations. The main source rocks in the Qiongdongnan basin are the Yacheng and Lingshui formations. Although both basins are overpressured, their fluid flows are greatly different. The combination of strong overpressure and tensile stress field caused by the right-lateral slipping movement has led both to the fractures in the top layers of the over-pressure systems and to the occurrences of diapirs, an expulsion pathway for the overpressured fluids including natural gases. The fluid flow in the Qiongdongnan basin, however, is compaction driven, and laterally dispersed from the deep depression towards its surrounding areas with a relatively low fluid potential. Traps associated with diapirs are regarded as important exploration targets in the Yinggehai basin, whereas the Neogene lithological-structural complex traps with the excellent pathways to the Oligocene source rocks or the Oligocene structural traps should be considered as the main exploration targets in the Qiongdongnan basin.
- hydrocarbon generation depression /
- fluid flow style /
- natural gas accumulation conditions /
- Yinggehai basin /
- Qiongdongnan basin

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图 1 琼东南盆地(a) 和莺歌海盆地(b) 构造格架的比较

Fig. 1. Comparison of tectonic frameworks of Qiongdongnan (a) and Yinggehai (b) basins

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图 2 琼东南盆地中央凹陷带三亚组底面镜质体反射率等值线(等值线单位: %)

Fig. 2. Contour map of vitrinite reflectance of base of Sanya Formation, Qiongdongnan basin

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图 3 琼东南盆地主要生烃凹陷下第三系生烃强度的比较

Fig. 3. Comparison of hydrocarbon generation intensities of Eogene for major hydrocarbon generation depressions, Qiongdongnan basin

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图 4 超压顶面起伏对水力破裂和流体释放点的控制作用示意图(a); 莺歌海盆地底辟的分布及其与沉降中心的关系(b)

Fig. 4. Schematic diagram illustrating control of uplift of overpressure top on hydrofracture and fluid release point (a); distribution of diapirs in Yinggehai basin and its relation to subsidence centers (b)

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图 5 琼东南盆地西部陵水组压力系数分布

Fig. 5. Contour map of pressure coefficients for Lingshui Formation in Qiongdongnan basin

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表 1 琼东南盆地生烃凹陷类型及其生烃演化特征

Table 1. Types of hydrocarbon generation depressions in Qiongdongnan basin

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