准噶尔盆地莫索湾凸起古油藏的流体证据

发布时间：2018-02-24 21:10

本文关键词： 准噶尔盆地莫索湾凸起三工河组古油藏调整演化　出处：《石油学报》2017年04期 　论文类型：期刊论文

【摘要】：对准噶尔盆地腹部地区古油藏分布及次生油气藏调整规律认识的局限性制约了该地区的勘探与开发。莫索湾凸起侏罗系三工河组在白垩纪位于古背斜的高部位,是油气的集散地,研究该区古油藏形成及演化过程对指导次生油气藏的发现至关重要。对莫索湾凸起三工河组进行流体包裹体分析和系列定量荧光分析,并结合构造演化史、生烃史和区域埋藏史-热史为古油藏的存在提供了流体证据,分析了其油气充注历史,并预测了次生油气藏的调整方向。研究结果显示:(1)莫索湾凸起三工河组在早白垩世早期开始接受油气充注形成古油藏,表现在储集层QGF指数大于4,GOI指数大于5%,古油藏充注时,油气被矿物捕获形成烃类包裹体,被捕获的两类包裹体荧光颜色和傅里叶红外光谱参数值说明随着烃源岩成熟度逐渐变大,油质也逐渐变轻。(2)新近纪地层掀斜时,古油藏被破坏,油气发生调整,表现在部分层段QGF指数较高,但是QGF-E强度较低。(3)莫索湾凸起三工河组经历了不只一期油气充注,推断其混入了侏罗系烃源岩生成的成熟度较低的油气,因为部分层段显示较低的QGF指数和较高的QGF-E强度,且TSF的R1分布范围很大。(4)构造显示莫索湾古油藏平面范围达700km2,古油藏被破坏后沿着各低凸带向北线状运移。
[Abstract]:The limitation of understanding the distribution of palaeoreservoir and the regulation of secondary reservoirs in the hinterland of Junggar Basin restricts the exploration and development of this area. The Sangonghe formation of Jurassic in the Mosuowan uplift is located in the high position of the paleoanticline in the Cretaceous. It is very important to study the formation and evolution of paleoreservoir in this area to guide the discovery of secondary reservoirs. The fluid inclusion analysis and series quantitative fluorescence analysis of Sangonghe formation in Mosuowan uplift are carried out and combined with the history of tectonic evolution. The hydrocarbon generation history and regional burial history-thermal history provide fluid evidence for the existence of paleo-reservoirs, and analyze their oil and gas filling history. The results show that the Sangonghe formation in the Mosuowan uplift began to accept oil and gas filling in the early Cretaceous to form the paleoreservoir. The results show that the QGF index of the reservoir is greater than 4% GOI > 5 and the paleoreservoir is charged. Oil and gas are trapped by minerals to form hydrocarbon inclusions. The fluorescence color and Fourier transform infrared spectrum parameters of the two types of trapped inclusions indicate that with the maturity of the source rocks gradually increasing, the oil quality becomes lighter and lighter when the Neogene strata are tilted. The destruction of paleoreservoir and the adjustment of oil and gas are manifested in the high QGF index of some formations, but the low QGF-E intensity. 3) the Sangonghe formation of Mosuowan uplift has experienced more than one stage of oil and gas filling and injection. It is inferred that the source rocks of Jurassic have lower maturity oil and gas, because some formations show lower QGF index and higher QGF-E strength. Moreover, the R1 distribution range of TSF is very large. The structure shows that the plane range of Mosuowan paleoreservoir is 700km2, and the paleoreservoir is transported along the low convex zone northward after the destruction of the paleoreservoir.
【作者单位】：中国石油勘探开发研究院;中国石油新疆油田公司勘探开发研究院;中国石油集团公司盆地构造与油气成藏重点实验室;
【基金】：国家重大科技专项(2016ZX05046-001) 中国石油天然气股份有限公司油气勘探重大科技项目(2016B-0301)资助
【分类号】：P618.13

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