鄂尔多斯盆地陇东地区上三叠统长7湖相致密油成藏动力分析

发布时间：2018-01-15 11:26

本文关键词：鄂尔多斯盆地陇东地区上三叠统长7湖相致密油成藏动力分析　出处：《矿物岩石地球化学通报》2017年04期 　论文类型：期刊论文

【摘要】：为探讨致密油成藏期次,结合成藏期烃源岩地层压力的估算,分析长7湖相致密油成藏动力,以鄂尔多斯盆地陇东地区上三叠统长7油层组致密油为例,通过有机地球化学与成藏动力学相结合的方法,结合区域地质资料,对所采集的样品进行储集层流体包裹体热动力学模拟和颗粒荧光定量分析(QGF与QGF-E),结果表明,研究区长7致密储集层发育5幕盐水包裹体与3幕烃类包裹体,代表连续一期三幕致密油成藏,成藏时间分别为142~139 Ma、128~122 Ma和114~106 Ma;PVT-sim模拟可得长7致密储集层烃类包裹体捕获压力为18.4~30.6 MPa,第1幕捕获压力为20.0 MPa左右,第2幕与第3幕捕获压力均大于25.0 MPa;早白垩世晚期,长7优质湖相烃源岩与致密储集层之间形成的源储压差为源储共生型致密油有效的成藏动力,成藏动力(源储压差)主要为3.6~27.8 MPa;第1幕致密油成藏动力为9.3 MPa,第2幕致密油成藏动力为14.9 MPa,第3幕致密油成藏动力为23.9 MPa。
[Abstract]:In order to discuss the reservoir forming stages of dense oil, combined with the estimation of source rock formation pressure during reservoir forming period, the dynamics of tight oil reservoir formation in Chang7 lacustrine facies were analyzed, taking the tight oil formation of Upper Triassic Chang7 formation in Longdong area of Ordos Basin as an example. Through the combination of organic geochemistry and reservoir forming dynamics, combined with regional geological data. The thermal dynamics simulation of reservoir fluid inclusions and the quantitative analysis of QGF and QGF-EN were carried out on the samples. The salt water inclusions of 5 acts and hydrocarbon inclusions of 3 acts are developed in the Chang 7 dense reservoir of the study area, representing the formation of oil reservoirs in three successive acts, with a time of 142 ~ 139 Ma, respectively. 1282Ma and 114106Ma; PVT-sim simulation shows that the capture pressure of hydrocarbon inclusions in Chang7 tight reservoir is 18.4m ~ 30.6 MPa, and the capture pressure of the first act is about 20.0 MPa. The capture pressure of the second act and the third act were higher than 25.0 MPA; In the late early Cretaceous, the source reservoir pressure difference between the lacustrine source rock of Chang7 and the tight reservoir was the effective reservoir forming force of the source reservoir and symbiotic tight oil. The main reservoir forming power (source storage pressure difference) is 3.6o27.8 MPa; The dynamics of dense oil accumulation are 9.3 MPA in the first act, 14.9 MPA in the second act and 23.9 MPA in the third act.
【作者单位】：中国石油大学(北京)油气资源与工程国家重点实验室;中国石油大学(北京)地球科学学院;
【基金】：国家自然科学基金面上项目(41372143) 高等学校博士学科点专项科研基金(20130007110002)
【分类号】：P618.13
【正文快照】： 全球油气工业的发展主要经历了构造油气藏、岩性-地层油气藏与非常规连续型油气藏3个勘探阶段(邹才能等,2013)。伴随北美威利斯顿盆地Bakken致密油(Miller et al.,2008)、德克萨斯州南部Eagle Ford致密油(Mullen,2010)、德克萨斯州中北部Fort Worth盆地Barnett致密油(Hill et

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