东濮凹陷北部膏盐岩分布特征及其对地层温度的影响

东濮凹陷北部地温场的形成受广泛分布的巨厚膏盐岩控制,并与构造位置、断裂热液活动、凹陷内部热流体活动有关。通过岩心观察及精细层序地层对比,将东濮凹陷北部划分为4套区域性膏盐岩和2套局部性膏盐岩,使用盆地模拟方法恢复了膏盐岩的热传导作用,并利用实测地层温度数据证实了膏盐岩对研究区现今地层温度的影响。研究发现,由于膏盐岩具有较好的热传导作用,导致其发育区及周边的地层温度产生异常高值,对烃源岩热演化和生排烃过程具有显著的促进作用。

Distribution characteristics of salt and its influence on geotemperature, north Dongpu depression

;The formation of geothermal field in north Dongpu depression is related to structural location,fracture hydrothermal activity and the internal thermal fluid activity in the depression.And,it is also controlled by widely distributed and very thick gypsum rock.Gypsum rock in north Dongpu depression is divided into four territorial gypsum rock sets and two localized gypsum rock sets by core observation and detailed correlation of sequence stratigraphy.This paper reconstructed the heat conduction effect of gypsum rock based on the basin simulation technique,and confirmed the influence of gypsum rock on the present-day geothermal field in study area by means of measured geothermal temperature data.It is found that the formation adjacent to the gypsum rock and rich in gypsum is of anomalous high geothermal temperature value because of gypsum rock’s high heat conduction effect.This phenomenon has remarkable effects on the thermal evolution of source rocks and the process of generation and expulsion of hydrocarbon.