PETROLEUM ACCUMULATION CHARACTERISTICS AND PRESERVATION CONDITIONS OF LIANYUAN SAG IN THE CENTRAL HUNAN
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摘要:
针对湘中涟源凹陷油气藏成藏期次和时间以及油气藏破坏、改造等进行详细研究, 发现存在多期油气充注。利用沥青、包裹体分析, 印支之前曾有过油的充注, 在印支早期、晚期共发生二期天然气充注。印支期既是高成熟天然气充注期, 又是构造圈闭形成时期, 燕山期只对前期气藏起破坏、改造作用。总结了4种油气藏破坏、改造、保存样式, 即原生油气藏后期无改造样式, 原生油气藏后期简单改造样式, 原生油气藏后期多期改造样式, 原生油气藏后期完全破坏样式。分析认为涟源凹陷3个构造带油气藏保存条件各异, 西部构造带保存最差, 中部较好, 东部最好。
Abstract:Based on the analysis of asphalts and inclusions in Lianyuan sag of Central Hunan, a study on the accumulation periods, destruction and transformation of oil and gas reservoirs has been researched. The result shows that the oil and gas charging occurred during pre-Indo-China movement, with earlier Indo-China movement and later Indo-China movement two times charging naturally. Indo-China Stage was not only high-matured gas time but also structural traps formed time, while Yanshan Stage played a destructive and transformative role on earlier traps and reservoirs. Four destruction, transformation and preservation models of reservoir are proposed, such as original reservoirs without destruction, original reservoirs with little destruction, original reservoirs with serious destruction, and original reservoirs with total destruction. Finally, it comes to a conclusion that three tectonic zones of Lianyuan sag have different preserving conditions, from west to east, the conditions become better and better.
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Key words:
- Lianyuan sag /
- preserve condition /
- destroying method of reservoirs
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表 1 涟源凹陷断裂破坏油气藏形式
Table 1. The models of breaking the hydrocarbon reservoirs by faults in the Lianyuan sag
样式 断裂 断裂发育类型 油气散失结果 破坏形式 构造运动导致
断裂活动后生
断裂挤压型断裂 
A 拉张型断裂 
B 起分散效应的断裂 
C 起集中效应的断裂 
D 伸入、未切穿盖层的断裂 
E 盖层顶部的断裂 
F 其他原因引起
断裂活动先生
断裂构造活动使得断裂重新活动、封闭性变差 
G 
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