辽河滩海地区油气藏断压控藏特征及勘探意义

辽河滩海地区是典型的中—新生代陆相断陷盆地,构造上具有东西分带、南北分区的特点,不同构造带油气运聚成藏及分布都与温压场特征密切相关。运用整体、耦合的观点和地温-地压系统理论,在详细分析对比东部凹陷和西部凹陷温压场分布特征的基础上,发现辽河滩海地区主要发育单一型、低压型和高压型3种地温-地压系统。其中:西部凹陷西部斜坡带发育单一型地温-地压系统,笔架岭构造带发育低压型地温-地压系统;东部凹陷海南月东地区和太葵地区则普遍发育高压型复式地温-地压系统。同时,对比分析东、西部各构造带油气藏的形成与分布特征,不同类型地温-地压系统与断裂配置表明辽河滩海地区为明显的断压控藏特征:西部斜坡带主要为单一型和低压型断压控藏;东部斜坡带则主要为高压型断压控藏。

The Significance and Characteristics on Faults and Temperature Pressure Systems Controlling the Hydrocarbon Migration and Accumulation in Beach Region of Liaohe Basin

The beach region of Liaohe basin is a youthful Cenozoic rift sedimentary basin with west-east depression and north-south division of the characteristics.In different structure belts hydrocarbon migration,accumulation and distribution are related to the fault systems and temperature and pressure field characteristics.Based on a detailed analysis and comparison of east and west depression geothermal field and ground pressure field distribution,by the coupling point of view and geotemperature-geopressure system(T-p) theory,the authors find that the single and lower-pressure type of T-p system develops in the western slope,and the overpressure T-p system develops in the east depression.Meanwhile,the combination of east and west of the structural belts forming and distribution of hydrocarbon reservoir characteristics,it indicates that both faults system and T-p systems control the migration and accumulation on the hydrocarbon and different types of T-p systems and faults configuration result in the different hydrocarbon reservoir characteristics: the western slope of mainly single-and lower-pressure fault and T-p system controlling migration model and the eastern depression is the overpressure controlling migration model.All these are important to confirm the key factors to control the hydrocarbon migration and accumulation in different belts in the beach of Liaohe basin.