岩性油气藏 ›› 2021, Vol. 33 ›› Issue (6): 2128.doi: 10.12108/yxyqc.20210603
李博1, 崔军平1,2, 李莹3, 李金森4, 赵金5, 陈彦武1
LI Bo1, CUI Junping1,2, LI Ying3, LI Jinsen4, ZHAO Jin5, CHEN Yanwu1
摘要: 伊陕斜坡是鄂尔多斯盆地重要的产油气区,油气成藏期次研究有助于判断三叠系油藏成藏过程及油藏的分布规律。为了确定三叠系延长组油气成藏期次,基于流体包裹体均一温度-埋藏史间接投影定年法,开展了系统的储层流体包裹体特征分析。结果表明:①鄂尔多斯盆地伊陕斜坡吴起地区三叠系延长组长4+5、长6储层主要为盐水包裹体和含液态烃包裹体,形态以椭球状-球状为主。②均一温度分析表明第1期与油气伴生的盐水包裹体均一温度主峰为90~100 ℃;第2期伴生的盐水包裹体均一温度主峰为130~140 ℃。③基于盐水包裹体的盐度、成分、盆地热演化史结果及储层伊利石K-Ar同位素定年结果分析,伊陕斜坡吴起地区延长组存在2期油气充注:第1期为早白垩世中期,距今130~115 Ma;第2期为早白垩世晚期,距今108~96 Ma。2次油气充注表明鄂尔多斯盆地伊陕斜坡延长组油气成藏时期为早白垩世(130~96 Ma)。该认识可为吴起及相邻地区三叠系油气勘探开发提供依据。
中图分类号:
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