大民屯凹陷地层水水文地质特征与油气聚集关系

对大民屯凹陷前第三系潜山、下第三系沙河街组地层水化学场研究发现，本区油田水总矿化度及二价阳离子浓度偏低，地层水总矿化度具有明显的垂向分带性，水体主要为陆相成因并受地表水渗入的影响较大，变质程度高，油田水的演化与盐类的溶解有关。该区地层水的流动受断裂和沉积砂体的控制，在水头压力、浮力动力场控制下其流动样式和分布规律反映了凹陷内油气的运聚规律，可为本区自生自储、新生古储式油气藏的判别提供有利证据。

Relation Between Hydro-Geologic Characteristics of Formation Water and Oil Migration and Accumulation in Damintun Depression

Studying the chemical fields of formation water of the Pre Tertiary buried hill type and in the Paleogene Shahejie Formation in Damintun depression,we found that total mineralization of the water and concentration of divalent cation were relatively low and that the formation water had obvious vertical mineralization zonation.The formation water was derived from land facies and greatly affected by surface water and thus had a high metamorphic grade.The evolution of the field water was related to salt dissolution.Migration of the formation water is controlled by faults and sandstone in the area.The migration and distribution controlled by head pressure and dynamic field of buoyancy can interpret the regularities of migration and accumulation of the hydrocarbon,which offers favorable evidence to judging oil pools of self generation and self accumulation as well as new generation and old accumulation types.