松辽盆地滨北地区地层水密度对水动力的影响

地层水动力条件是影响松辽盆地滨北地区油气成藏的重要因素。地层水驱动力包括重力驱动、应力驱动和浮力驱动,前人针对浮力驱动的研究较少。一般都是从构造形态、地层压力、地层渗滤条件、地层水化学特征入手,研究向心流和离心流的分布。通过矿化度参数计算了地层水密度,研究了盆地边缘到坳陷中心地层水密度的变化引起变密度流体之间的浮力效应,用驱动力影响系数(DFR)分析重力驱动与浮力驱动的相对强度。研究表明油层产状、渗入水水头和流体密度等因素相互影响形成局部地区浮力效应显著地带,对整体流体运移方向产生影响。

Influence of formation water density on hydrodynamic force in Binbei area of Songliao Basin

The hydrodynamic conditions is an important aspect for the hydrocarbon accumulation conditions in Binbei area of Songliao Basin. Hydrodynamic force include gravity driven, stress driven and buoyancy driven. Previous studies less concerned about the buoyancy driving force. The general research on hydrodynamic force start from the formation pressure, structure, stratum percolation condition and formation water chemical characteristics, consider the distribution of centripetal flow and centrifugal flow. This work calculate the formation water density from salinity. The diference of water density from the basin edge to the center of the depression cause buoyancy effect . By means of driving force factor(DFR)analysis the significance of gravity driven and buoyancy driven. Research shows that reservoir attitude, the water head and fluid density influencing each other forming a significant area of buoyancy effect in local areas,which will influence the overall direction of flow.