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莫索湾地区地层水发育情况十分复杂,存在苏林分类的Na2SO4,NaHCO3,MgCl2和CaCl2型水。在纵向上的两个压力系统中,下部高压层地层水发育为反向水化学沉积序列,上部常压层的水化学沉积序列在不同区域有所差异。结合研究区区域构造特征,通过对地层水水型、矿化度特征等的综合分析,认为莫索湾地区地层水处于NaHCO3型水的水文地质体系中;CaCl2型水来自于深部地层,通过断裂构造的沟通运移至目的层;而Na2SO4和MgCl2型水是由较高矿化度CaCl2型水与较低矿化度NaHCO3型水混合而成的;盆5井区与盆参2井区地质条件的差异造成了两井区常压层水化学沉积序列的不同;而成岩作用和生烃作用造成了高压层的反向水化学沉积序列。
Formation water in the Mosuo Bay area is very complicated. There are Surin class Na2SO4, NaHCO3, MgCl2 and CaCl2 water. In the vertical two pressure systems, the formation water in the lower high-pressure formation develops into reverse water chemical sedimentary sequence, and the water chemical sedimentary sequence in the upper atmospheric zone varies in different regions. Combined with the regional tectonic features of the study area, through the comprehensive analysis of formation water and salinity features, it is considered that the formation water in the Mosesau Bay is in the hydrogeological system of NaHCO3-type water; CaCl2-type water comes from the deep formation, The communication of the structure moved to the target layer; and Na2SO4 and MgCl2-type water is composed of a higher salinity of CaCl2-type water and a lower salinity of NaHCO3-type water mixing; The difference of the conditions leads to the difference of atmospheric depositional sequence of atmospheric pressure in the two wells. The diagenesis and hydrocarbon generation result in the reverse water chemical deposition sequence of the high pressure layer.