源外上生下储成藏主控因素及有利区预测——以松辽盆地尚家地区泉二段为例

尚家地区位于三肇源区之外，且泉二段储层又位于青一段源岩之下，以此认识为基础，分析了三肇源区青一段油向尚家地区泉头组的运移机制。三肇源区青一段油在超压作用下通过T2源断裂向下“倒灌”运移进入扶杨油层．然后在浮力作用下通过被断裂沟通的砂体侧向运移至尚家地区，并直接进入与扶杨油层相接触的泉二段高断块圈闭中聚集成藏。尚家地区泉二段油成藏与分布主要受泉二段高断块圈闭发育、高断块圈闭位于油运移路径上和高断块圈闭内砂体发育3个因素的影响。通过主控因素分析得出，尚家地区泉二段油成藏的Ⅰ类有利区分布在尚9—6、尚118—120、尚124-112井等区域内及升26—14井周围，Ⅱ类有利区主要分布在尚9—6和尚118—120井一线的北部地区。

Controlling factors of above-generation and below-storage reservoir accumulation and favorable area prediction: A case study from K1q2in Shangjia region of Songliao Basin

Shangjia region is outside of Sanzhao source area, and K1q2 reservoir is below K1qn1 source rocks. The migration mechanism of oil from K1 qn1 to Shangjia region is analyzed. Oil in Sanzhao source area firstly migrated downward into Fuyang reservoir through T2 faults under the action of overpressure, and then migrated to Shangjia region through sand bodies connected by faults under the action of buoyancy, finally directly migrated and accumulated in high fault block traps of Klq2 which were in contact with Fuyang reservoir. The oil accumulation and distribution of K1q2 in Shangjia region are mainly controlled by three factors： high fault block traps developed in K1q2, high fault block traps located in the pathway of oil migration and sand bodies developed in high fault block traps. Based on the analysis of main controlling factors, it is considered that type Ⅰ favorable areas of oil accumulation of K1q2 in Shangjia area mainly distribute in the areas controlled by Shang 9-6, Shang 118-120 and Shang 124-112 wells and around Sheng 26-14 well, and type Ⅱ favorable areas mainly distribute in the northern region along Shang 9-6 and Shang 118-120 wells.