摘要
本文针对舞阳陆相盐湖盆地盐泥互层的地层结构特殊性 ,从盆地内异常流体压力分布特征出发 ,结合盆地埋藏史和热演化史 ,分析探讨其形成机理。压力计算结果表明盐湖盆地内异常流体压力可分为浅、中、深 3套压力封闭体系 :浅层为渐变过渡中等异常高压体系 ;中间盐泥间互发育段为多套低异常高压体系 ;深部为突变高异常压力体系。异常压力的形成主要与快速沉降造成不均衡压实引起的非渗透性岩层中流体不能排泄出的欠压实作用有关 ,还与水热增压。
WT5BZ]Based on the particularity of stratigraphic structure for the salt mud interbeds of the Wuyang Continental Salt lake Basin,the authors discussed the genetic mechanism of anomalous fluid pressure in the basin starting with its destributive characteristics combined with the burial history and thermal evolutionary history of the basin.The calculated results of pressure reveal that the anomalous fluid pressure in the salt lake basin can be classified into shallow,middle and deep three sets of pressure sealing systems,that is the gradational and transitional moderately anomalous high pressure system in shallow beds,the mutiple sets of low degree anomalous high pressure system in middle salt mud interdeveloping members and the abrupt high degree anomalous pressure system in deep beds.The formation of anomalous pressure is mainly related to the undercompaction that the fluid in nonpenetrative beds cannot drain off due to non isostatic compaction result from rapid subsidence.It also has something to do with hydrothermal pressure enhancement,organic matter converting into hydrocarbon,tectonic compression,etc.
出处
《石油实验地质》
CAS
CSCD
北大核心
2000年第3期265-269,共5页
Petroleum Geology & Experiment
关键词
成因机理
盐湖盆地
油气运聚
油气分布
地层压力
genetic mechanism
anomalous pressure
gypsum beds
salt lake basins
Wuyang
