龙门山前陆盆地南段须五段沉积特征

发布时间：2018-01-19 19:32

本文关键词： 沉积特征辫状河三角洲湖泊沉积须五段龙门山前陆盆地　出处：《断块油气田》2017年06期 　论文类型：期刊论文

【摘要】：龙门山前陆盆地南段上三叠统须家河组须五段是该区重要的油气产层,由于长期被视为烃源岩与盖层,对其沉积相研究相对较少。文中利用野外实测剖面、测录井资料,并结合前人研究成果,对该地区须五段沉积相类型、砂体分布特征、沉积体系空间展布特征进行了系统分析,得出研究区须五段主要发育辫状河三角洲和湖泊2类沉积体系,识别出分流河道、分流间湾、河漫沼泽、河口砂坝、远砂坝及浅湖泥等微相。须五段沉积时期,研究区西北部主要发育大型辫状河三角洲,东南部多发育湖泊沉积体系。砂体厚度由西北部向东南部逐渐减薄,沉积相类型由辫状河三角洲沉积过渡到湖泊沉积,物源可能来自于西北方向。
[Abstract]:The Xujiahe formation of the Upper Triassic Xujiahe formation in the southern segment of Longmenshan Foreland Basin is an important oil and gas producer in this area. Because it has been regarded as the source rock and caprock for a long time, the study of its sedimentary facies is relatively few. The field measured section is used in this paper. Based on the logging data and previous research results, the types of sedimentary facies, the distribution characteristics of sand bodies and the spatial distribution characteristics of sedimentary system in this area are systematically analyzed. The sedimentary systems of braided river delta and lake are mainly developed in the five member of the study area, and the microfacies such as distributary channel, distributary bay, river swamp, estuarine bar, far sand dam and shallow lake mud are identified. Large braided river deltas are mainly developed in the northwest of the study area and lacustrine sedimentary systems are developed in the southeast. The thickness of sand bodies decreases gradually from the northwest to the southeast. The sedimentary facies type transition from braided river delta to lacustrine deposit, the provenance may come from northwest direction.
【作者单位】：成都理工大学油气藏地质及开发工程国家重点实验室;中国地质调查局成都地调中心;
【基金】：国土资源部地质调查项目“龙门山前缘油气勘探新领域研究”(12120115004501-01) 国家自然科学基金青年基金项目“龙门山前陆盆地南部晚三叠世沉积——物源体系及其构造动力学指示”(41502116)
【分类号】：P618.13
【正文快照】： 0引言龙门山前陆盆地是由晚三叠世印支运动形成的重要含油气盆地[1￣2]。一直以来,许多学者都将须家河组须五段视为上覆须六段和自流井组储层的主力烃源岩及下伏须四段储层的盖层[3￣5]。2009年之后,许多学者通过非常规油气的勘探分析和有利区评价,认为龙门山前陆盆地须五段泥

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