松辽盆地的深盆油藏

Deep basin reservoir in Songliao Basin

借鉴深盆气的形成机理,从沉积及储集层特点、烃源岩超压、油气运移动力、油水分布特征等方面深入剖析松辽盆地扶杨油层的成藏机制。认为坳(凹)陷中大面积分布的低渗透油藏可称为深盆油藏,其成藏特点与常规岩性油藏不同:①砂岩全盆地连续分布,凹陷区储集层致密;②油源充足,超压为主要排烃动力,浮力作用弱;③油藏平面分布具有油水倒置现象;④油层连片分布,产量普遍较低,但局部存在储集层厚度大、物性好、单井产能高的经济勘探地区,即“甜点”。建立了松辽盆地扶杨油层深盆油藏成藏模式,预测松辽盆地深盆油藏的资源潜力巨大,指出应转变勘探思路,向富油坳(凹)陷拓展,转变资源定位,调整预探目标和勘探技术序列,勘探深盆油藏。

According to the formative mechanism of deep basin gas, the pool-forming mechanism of Fu-yang oil layer in Songliao Basin was studied from the aspects of depositional reservoir character, overpressure of source rock, power of hydrocarbon migration and hydrocarbon distribution. The paper argues that the widely distributed low-permeability reservoirs are different from the conventional lithological reservoir and belong to deep basin reservoir： sandstones are continuously distributed in the whole basin, reservoirs are compact in the depression area; oil sources are abundant and with overpressure as the major driving force of hydrocarbon expulsion; the phenomenon of oil underlying water exists; oil layers of low production rate are widely distributed, there are local economical exploration areas with reservoirs of great thicknesses and good properties. The deep basin reservoir pool-forming pattern of Fu-yang oil layer is established, by which a great resource potential is forecasted in the deep basin reservoirs. The adjustment of exploration strategies is suggested.