OALib Journal期刊
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塔里木盆地巴麦—塔中地区晚古生代古构造演化及油气成藏分析
Keywords: 塔中隆起,巴楚隆起,麦盖提斜坡,晚古生代,构造演化,剥蚀厚度恢复,油气运移
Abstract:
?本文基于钻井和地震资料绘制的巴麦—塔中地区上古生界古构造图,通过恢复巴麦—塔中地区的上古生界沉积厚度,阐述了油气进入储层后由古构造低部位向高部位运移的动态演化过程,了解了该区油气离开烃源岩或烃源岩区以后的运聚、聚集和散失情况。研究得到以下认识:①晚古生代时期巴麦—塔中地区隆、拗格局与现今相比有较大差异,巴楚隆起和塔中隆起在晚古生代已初步形成,石炭纪时两者呈北西向展布,塔中古隆起高点比现今隆起高点更偏西,两个隆起之间的和田河地区现今构造是一个低隆,但晚古生代时期却曾是古拗陷和鞍部,研究区南部南西倾的麦盖提斜坡在海西期是一个西深东浅的东西向拗陷;②东河砂岩顶面的古构造形态演化表明,满加尔拗陷生成的油气在白垩纪末期以前向北运移,无法在塔中隆起聚集,在新近纪以后才向南运移,被塔中隆起高点1号带和10号带的圈闭捕获形成油气藏,而构造较低的塔中隆起南坡圈闭无法捕获满加尔拗陷的油气,这可能是该区许多探井失利的原因;③麦盖提斜坡北部—和田河低凸是塔西南拗陷多构造期油气运移聚集区,塔中隆起高点及北侧是满加尔拗陷喜山期油气供给聚集区,塔中隆起东端是油气运移最终指向区,也是东河砂岩上倾尖灭带,以上区域存在多套储盖组合,是巴麦—塔中地区的有利勘探区。
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