西北地质2024，Vol.57Issue(2)：244-253,10.DOI:10.12401/j.nwg.2023112
天环坳陷南北部盒8段地层水地化特征差异性分析
Analysis on Geochemical Characteristics and Difference of Formation Water in He 8th Member in Northern and Southern Tianhuan Depression
摘要
Abstract
Based on the statistics and analysis of the test results of formation water samples of He 8th Member of Tianhuan depression,Ordos basin,the geochemical characteristics of the northern and southern parts of the area are studied,and the differences were compared.The results show that the formation water of He 8th mem-ber of Tianhuan Depression is acidic and CaCl2 water type,and the mineralization degree,Cl-content and con-centration in the area are higher in the north than in the south.It reflects that the sealing condition of formation water in the Tiekesumiao area in the north is better than that in Qingshimao-Lizhuangzi area in the south,which is more conducive to the accumulation and preservation of gas reservoirs.The Geo-chemical characteris-tic parameters of formation water in the north and south have good correspondence with the formation condi-tions of the gas reservoir.The formation water in the northern area is characterized by low sodium-chloride coef-ficient,low desulfurization coefficient,low sodium-calcium coefficient and high metamorphic coefficient.The formation water is of Ⅳ-type and Ⅴ-type original formation water,which is favorable for the accumulation and preservation of gas reservoirs.In the southern area,the formation water of Ⅱ-type,Ⅲ-type and Ⅳ-type shows poor sealing conditions,and the formation water communicates with the outside world,which is not conducive to the accumulation and preservation of gas reservoirs.关键词
地层水/地化特征/差异性/盒8段/天环坳陷Key words
formation water/geochemical characteristics/difference/He 8th Member/Tianhuan depres-sion分类
天文与地球科学引用本文复制引用
吴颖,孙磊,冯敏,李爱荣,卢达..天环坳陷南北部盒8段地层水地化特征差异性分析[J].西北地质,2024,57(2):244-253,10.基金项目
国家自然科学基金项目"鄂尔多斯盆地南部长6油层组地层水特征与油气富集规律研究"(41772140). （41772140）
