摘要
吐哈盆地台北凹陷油气封盖的主控因素，在微观封闭性能已满足现今油气藏封盖的油气柱高度时，已转变为盖层厚度变化、平面展布的稳定性和断裂的发育与活动。在两套区域盖层中，七克台组泥质超压层构成的第二套区域性盖层，超压值大于２０ ＭＰａ 和厚度大于２００ ｍ 的范围几乎覆盖了全凹陷，且厚度稳定连续，对其下的两期油气进行了有效的封盖，９５ 以上的储量位于其下地层，控制了油气的空间展布和富集程度，为最重要的区域性盖层。喜山期断裂活动产生的断裂，在各地的影响不同，鄯善油田以东地区，对油气破坏和调整较弱，两套区域性盖层相对保存完好，油气基本保持原始的展布风貌；以西地区断裂活动较强，两套盖层受到不同程度的切割，打乱了油气的原始展布状态，甚至伴有较大程度的散失。
When microscopic sealing features satisfy oil reservoir sealing height,the major oil and gas sealing factors of Taibei Sag in Turpan Harmi Basin are related to caprock thickness,stable plane distribution,fault development and activities.Within two caprock sets of the study area,the Qiketai Formation argillaceous overpressure interval,second set caprock with 20 MPa overpressure and more than 200 m thickness which is the nearly covers the whole sag with continuous and stable distribution,and effectively seals the underlying two stages of oil and gas and more than 950/0 oil and gas reserves.The faults formed in Himalaya Stage in the east part of Sansan Region made less damage on oil and gas,two sets of caprocks preserved completely,and oil gas distribution thus ketp the original style.In the west part of the region,the fault activities were intensive,the two sets of regional caprocks were broken and the original oil gas distribution style was destoried.This is favourable for the formation of oil and gas reservoirs in Himalaya stage.
出处
《石油与天然气地质》
EI
CAS
CSCD
北大核心
1999年第3期232-236,共5页
Oil & Gas Geology
关键词
台北凹陷
油气封盖
油气聚集
油气藏形成
Taibei Sag
oil gas sealing
abnormal pressure
oil gas accumulation
major factor
