渤海湾盆地东濮凹陷文留构造发育特征与气藏形成

THE TECTONIC EVOLUTION AND RESERVOIR FORMATION IN WENLIU AREA, BOHAIWAN BASIN

许化政 周新科

XU Hua-zheng HOU Xin-ke

中原油田研究院, 河南, 濮阳, 457000 2. 中国石化, 石油勘探开发研究院, 北京, 100083

Research Institute of Zhongyuan Oilfield, Henan, Puyan 457000, China 2. Exploration & Production Research Institute, SINOPEC, Beijing 100083, China

文留构造是Es3(2)-Es2期间在中央隆起带背景上因盐聚集而形成的背斜构造,构造翼部因盐滑塌而使圈闭幅度加大.C-P煤系因埋深加大而进入二次生气期,并在约4000m发生初次运移.烃源岩的主体埋深5200～6300m,位于文东和前梨园地区.煤成气以微裂缝-裂隙(断层)网络为主要通道向中央隆起带运移,并在东营运动(Ⅱ幕)期达到最大规模.天然气进入圈闭后,首先充注Es4(3-5)段Ⅰ类和Ⅱ类储层(驱水效率73%～56%),后随着气柱加大驱替压力增加而向Es4(1-2)和Es4(7-8)Ⅲ类储层中扩散,最终驱水效率约为40%.

Wenliu structure is an anticline caused by salt-gathering on the background of center mole track,it was formed from Es3(2)to Es2.The extent of the trap is enlarged because of the salt-slumping of the wings.With the increase of the burial depth,C-P coal formation began its secondary hydrocarbon generating,and started migrating at depth of 4 000m for the first time.The main source rock was located in Wendong and Qianliyuan areas,with the depth of 5 200～6 300m.Micro-fracture-fault network was the main way for the coal-derived gas to migrate to the center mole track,the migration reached its peak at the age Ed (Ⅱ episode).In the trap,the gas prefered to entering the typeⅠand Ⅱreservoirs in Es4(3-5)(the water-displacement rate is 73%～56%),then with the increase of the gas column and pressure,the gas began to enter the type Ⅲ of reservoir in Es4(1-2 and Es4(7-8),the final water-displacement rate is 40%.

中国石化科技项目(P0002).

https://doi.org/10.11781/sysydz200306712