Fine evaluation and favorable area prediction of deep source rocks in northern Songliao Basin

Focusing on Xujiaweizi fault depression, the geological conditions and geochemical characteristics of deep natural gas formation in north Songliao basin are evaluated, resources estimated, favorable areas optimized. Shahezi Formation shale is a set coal bearing sediments with high organic matter abundance (TOC 1%～12%), over maturity (Ro 1%～4%) shore shallow lake facies, which mainly distributed Gulong-Lindian depression Yingshan depression. The thickness, TOC, R o hydrocarbon generation four thirdorder sequences different lithology (mudstone coal) carefully evaluated for layer Songbei. comprehensive evaluation shows that mudstone thickness Es4 member Anda Xuzhong large (150 ~ 525m), TOC (1% 4%), thermal evolution degree (R 1.2% 3.4%), intensity (20 815) × 108m 3 / t), moderate buried depth (3000~4500m) overlapping area 756km 2 . It exploration Daqing Oilfield.