莺歌海盆地DF1-1底辟断裂系统及其对天然气成藏的控制

殷秀兰; 李思田; 杨计海; 张启明; 童传新

莺歌海盆地DF1-1底辟断裂系统及其对天然气成藏的控制

1.
中国地质科学院地质力学研究所，北京 100081
2.
中国地质大学资源学院，湖北武汉 430074
3.
南海西部石油公司，广东湛江 524057

基金项目:

国家自然科学基金项目 40102012

国家自然科学基金项目 49732005

详细信息

作者简介:
殷秀兰（1968－），女，博士，副研究员，主要研究方向为盆地构造与流体. E-mail：xlyin@yin.com.cn

中图分类号: P542; P618.130.2
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出版历程
- 收稿日期: 2001-12-07
- 刊出日期: 2002-07-25

Fault System and Its Control over Gas Accumulation in DF1-1 Diapir, Yinggehai Basin

1.
Insitute of Geomechanics, CAGS, Beijing 100081, China
2.
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China
3.
China Offshore Oil Nanhai West Corp, Zhanjiang 524057, China

摘要

摘要: 莺歌海盆地的巨厚充填、高地温梯度及大规模的超压流体活动等特殊的地质背景, 造就了DF1- 1底辟构造的独特性, 其内天然气的总体特征与底辟区的断裂系统存在着密切的联系.底辟区内的超压流体活动使其上覆地层产生众多的断裂和裂隙.这些垂向上的断裂和裂隙既构成了异常压力体系能量释放的主要通道, 同时也形成了天然气运移的垂向输导体系.在断裂开启过程中上升的活动流体主要取决于断裂下延的深度及断裂上延所连通的中深-浅层的渗透性砂体, 因此由断裂与砂体的相互配置所构成的输导体系在DF1- 1气田的成藏中起着重要的作用.根据DF1- 1的成藏特点, 强调断裂系统与天然气运聚的相互促进关系, 建立了断裂系统与天然气成藏关系模式.
- DF1-1底辟 /
- 断裂系统 /
- 天然气成藏 /
- 天然气运聚
Abstract: Yinggehai basin has peculiar sedimentary, tectonic and evolution model and is abundant in hydrocarbon resources. As the main and typical structure in diapir area, DF1-1 diapir develops a lot of faults and cracks, virtually related with gas accumulation. The process of formation, opening and closing of the faults in the top of the diapirs basically display the progression of the fluid/gas migration. When overpressure reached such a critical value with oil/gas accumulating and pressure increasing, faults open as the pathway of oil/gas migration. It will be more favorable if the fault cut the sandstone bodies or fractures in the overpressure area, which might result in oil/gas accumulating into these sandstone bodies (reservoirs). Therefore, faults are the fluid released pathway and sandstone bodies and fractures as reservoirs of oil/gas in DF1-1 diapir. The spatio temporal match of vertical source rocks, reservoir and seals, combined with fault system provided by diapirism, result in the formation of large DF1-1 gas field. The models about fault system and gas accumulation have also been presented and discussed.
- DF1-1 diapir /
- fault system /
- gas accumulation /
- gas migration

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图 1 莺歌海盆地底辟体分布及其断裂特征

1.底辟体; 2.盆缘断裂; 3.底辟内部断裂; 4.推测断裂; 5.底辟体展布方向

Fig. 1. Distribution of diapirs and characters of faults in Yinggehai basin

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图 2 莺歌海盆地地震剖面断裂特征

Fig. 2. Characters of faults from seismic profile in Yinggehai basin

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图 3 DF1-1底辟T₂₇界面断裂分布

Fig. 3. Faults distribution of T₂₇ in DF1-1 diapir

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图 4 DF1-1底辟断裂系统与天然气成藏关系模式

1.断裂及裂隙; 2.天然气/流体运移方向; 3.砂体; 4.层序界线; 5.含气层

Fig. 4. Model of fault system and gas accumulation in DF1-1 diapir

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表 1 DF1-1底辟构造气水界面对比

Table 1. Contrast of gas-water interfaces in the DFl-1 diapir

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