| 摘要: |
| 潍北凹陷分为两个压力体系,北部洼陷带发育异常低压体系,实测的地层压力梯度为0.005 ~ 0.009MPa/m;南部地区为常压体系,压力梯度为0.0094~ 0.011MPa/m。研究结果表明,潍北凹陷异常低压力体系的形成既与古近纪的地层抬升和剥蚀作用有关,又与地温梯度的降低有关。地层水的浓差作用和流体的供排不平衡是形成潍北凹陷南北地区压力体系差异的主要原因。潍北凹陷地层压力系统演化经历了从异常高压至异常低压,再至压力分异的演化过程。 |
| 关键词: 潍北凹陷 压力体系 成因 山东 |
| DOI： |
| 附件 |
| 投稿时间：2006-06-21 |
| 基金项目: |
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| The pressure systems and their genesis in the North Weifang depression, Shandong |
| LI Jian-jun, ZHU Tian-gao, LI Zheng, ZHU Ri-fang |
(1. Dongsheng Corporation, Shengli Oil Field, SINOPEC, Dongying 257000, Shandong, China;
2. Research Institute of Geological Sciences, Shengli Oil Field, SINOPEC, Dongying 257000, Shandong, China) |
| Abstract: |
| Two pressure systems are recognized in the North Weifang depression, Shandong. The abnormal underpressure system appears in the northern part of the depression, where the measured formation pressure gradients range between 0.005 and 0.009 MPa/m. The normal pressure system is developed in the southern part of the depression, where the measured formation pressure gradients range between 0.0094 and 0.011 MPa/m.These data have revealed that the formation of the abnormal underpressure system is related to both the uplift and erosion of the Paleogene strata and the decrease of geothermal gradients in the northern part of the depression. The concentration differences and disequilibrium of supply and discharge of the formation water are responsible for the differences in the pressure systems in the northern and southern parts of the depression. These pressure systems have experienced evolutionary processes from overpressures to underpressures and finally to pressure differentiation. |
| Key words: North Weifang depression pressure system genesis Shandong |
