论文部分内容阅读
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、有机物转化成烃及构造挤压等有关
In this paper, according to the peculiarities of stratigraphic structure of saline-mud interbeds in the Wuyang continental salt lake basin, based on the pressure distribution characteristics of anomalous fluids in the basin, combined with the burial history and thermal evolution history of the basin, the formation mechanism is analyzed. The pressure calculation results show that the pressure of abnormal fluid in the Salt Lake Basin can be divided into three sets of pressure closure systems of shallow, middle and deep depths: the middle layer is medium-high pressure transitional system with gradual transition; the middle section of salt mud is multiple sets of low-anomalous high pressure system; To mutate high abnormal pressure system. The formation of abnormal pressure is mainly related to the under-compaction that the fluid in the non-permeable rock formation caused by the unbalanced compaction caused by rapid subsidence is under-compaction, hydrothermal pressurization, conversion of organic matter to hydrocarbons and tectonic compression