“盆”“山”耦合在异常高压盆地流体研究中的应用

这是以"盆""山"耦合理论指导盆地异常高压研究的首次尝试。异常高压的成因和分布特征主要取决于区域构造应力场,在挤压型盆地中形成异常高压的主控因素是挤压应力和天然气(油气)充注,异常高压呈平行造山带的(宽)带状或连续的面状分布;拉张型盆地和剪切—拉分盆地的主控因素是热作用。异常高压在拉张型盆地中为散点状或被分隔的面状分布,在剪切型盆地中呈点状或散点状分布。不同类型的盆地内断裂的产状不同,决定了异常高压有不同的传导方向,挤压—反转时异常高压的保存或释放(泄压)也各具特点。这为"盆""山"耦合从指导盆地动态演化的研究发展引伸为指导储层和流体动态演化的研究跨出了重要的一步。

Application of basin-orogeny coupling in study of abnormally high pressured basin fluids

The basin-orogeny coupling theory was applied to study the abnormally high pressure in basin for the first time in this paper.The formation and distribution of abnormally high pressure were controlled by regional stress fields.In compressed basins,the key contributing factors for abnormally high pressure were compressive stress and charging of natural gas(or oil-gas),where the abnormally high pressure distributed zonaly or planarly.In extended and pull-apart basins,the abnormally high pressure was mainly resulted from thermal activities.In extended basins,the abnormally high pressure distributed in the shape of scattered points or restricted planes,and it distributed pointedly or in the shape of scattered points in sheared basins.The reverse,normal and strike-slip faults had different occurrences,which decided the oblique or vertical conductions of abnormally high pre-ssure.There were different ways for pressure reservation or releasing in compression or reversion.From the dynamic evolution of basin to the dynamic evolution of reservoir and fluid,it was an important step for the application of basin-orogeny coupling theory.