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沉积盆地中普遍存在高矿化度地层水,并以CaCl_2型水最为常见。研究认为高矿化度地层水成因主要包括:(a)地表蒸发浓缩作用;(b)地下岩盐溶解作用;(c)隔膜渗透。通过地层水化学分析及其展布特征,可较好地解释盆地流体的活动规律,并能为盆地动力学研究提供丰富的动态信息。地层水化学特征的各种参数,如变质系数(rNa/rCl)、脱硫系数(100×rSO_4/rCl)、碳酸盐平衡系数(rHCO_3+rCO_3)、钙镁系数(rCa/rMg)和钠钙系数(rNa/rCa)等的组合特征,又可以判断盆地内有利于油气的聚集与保存的层段。
Highly salinity formation water is commonly found in sedimentary basins, and CaCl2-type water is the most common. The study suggests that the causes of high salinity formation water mainly include: (a) surface evaporation and concentration; (b) underground rock salt dissolution; (c) diaphragm penetration. Through the chemical analysis of formation water and its distribution characteristics, it is possible to explain the fluid law of the basin well and provide abundant dynamic information for basin dynamics research. Various parameters of formation water chemistry such as metamorphic coefficient (rNa / rCl), desulfurization coefficient (100 × rSO 4 / rCl), carbonate balance coefficient (rHCO 3 + rCO 3), calcium and magnesium ratio (rCa / rMg) Coefficient (rNa / rCa) and other combination features, but also determine the basin is conducive to the accumulation and preservation of oil and gas layers.