鄂尔多斯盆地西缘马家滩地区地层水与油气成藏关系研究

基于鄂尔多斯盆地西缘构造演化特征,对马家滩地区现今地层水及流体包裹体所指示的古地层水化学性质进行了对比研究分析,揭示了研究区地层水与油气藏圈闭演化的特征关系。研究表明,现今地层水分布在鄂尔多斯盆地西缘逆冲断褶带及与其东邻的天环坳陷地区呈东西分带的特征;流体包裹体指示的古地层水在鄂尔多斯盆地西缘逆冲断褶带和其东邻的天环坳陷的古地层水性质具有相似性,对比结果表明,鄂尔多斯盆地西缘马家滩地区在古地质历史时期,其油气聚集成藏处于封闭的地质环境中,在晚期构造运动的影响下,导致早期油气藏破坏,地表水渗入与油气发生了强烈的淋滤交换作用。 

Study of stratum water and oil and gas accumulation relations of Mjjiatan area in the Western Ordos Basin

Based on the characteristics of tectonics evolution in the western Ordos Basin,the author compared chemical characters of underground water with paleo-fluid from fluid inclusions,and indicated the relationship between underground water and evolution of oil and gas accumulation.The results from the research suggested that the distribution of formation water at the western Ordos Basin thrust fault-fold belt and its adjacent Tianhuan Depression is from east to west,and the paleo-fluid from fluid inclusions is similar to the ancient stratum water in this area.From the comparison the oil and gas accumulation was in a closed geological environment in the Majiatan area of western Ordos Basin,and with the late influence of tectonic movement,it was damaged,and strongly eluviated with infiltrating surface water.