Strike-slip faults and their effects on the hydrocarbon accumulation in the central depression of the Lunpola Basin in Xizang
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摘要: 伦坡拉盆地前期勘探主要在南、北构造带，对中央凹陷带构造的勘探和成藏研究较少。本文利用最新获取的地震和钻井资料，分析盆地中央凹陷带走滑断层发育和演化特征，结合典型油藏解剖，明确走滑断层对油气成藏的影响，指导油气勘探工作。走滑断层剖面上具有断面较陡、花状构造特征，空间上见"忽正忽逆"的海豚效应、断层两侧地震反射特征不协调等标志现象。走滑断层与油气成藏之间有着密切关系，其控制盆地的构造格局、沉积体系次级生烃洼陷的发育，形成高地温场，促进油气生成，形成一定规模的构造圈闭群，利于油气聚集，是油气运移的重要通道。但走滑断层的晚期活动可能破坏原生油藏，造成油气散失稠化和调整分配。江F2和蒋F1走滑断层所夹持的伦坡日断块圈闭面积大，处于主要生烃洼陷，是下一步勘探的有利目标区。Abstract: The present paper deals, on the basis of seismic data and well logs, especially the anatomy of the representative oil reservoirs, with the formation, evolution and effects of the strike-slip faults on the hydrocarbon accumulation in the central depression of the Lunpola Basin in Xizang. The strike-slip faults in the study area have the steep fault plane and flower-like structures, and spatially display the "dolphin effects" and discordant seismic reflections on both sides of the strike-slip faults. The strike faults may have the controls on the structural framework of the Basin, and the development of the secondary hydrocarbon-generating depressions and structural traps. They may serve as the important pathways for the hydrocarbon migration as well. However, they may be destructive to the primary oil reservoirs due to the subsequent faulting of the strike-slip faults. The Lunpori fault blocks sandwiched between the Jīang F2 and Jǐang F1 strike-slip faults in the central depression may be the favourable area for the future oil and gas exploration in the Lunpola Basin.
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Keywords:
- hydrocarbon accumulation /
- strike-slip fault /
- central depression /
- Lunpola Basin
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