河套盆地呼和坳陷油气成藏地质条件分析

发布时间：2019-04-21 06:44

【摘要】：本文以石油地质理论为指导,充分利用地球物理测井、地震、重磁、录井、露头勘测以及实验测试分析等多元资料信息,在分析区域地质背景和前人研究成果基础上,通过地层、沉积、构造等基础地质特征研究,重点对河套盆地呼和坳陷第四系及上新统生储盖等油气成藏条件分析和成藏机理研究,寻找圈闭,进行有利区带预测。研究认为河套盆地为中新生代断陷盆地,北深南浅,箕状不对称结构,呼和坳陷为其第二大次级坳陷区。自白垩系开始断陷下沉,沉积的地层主要有:下白垩统、始新统、渐新统、中新统、上新统及第四系。河套盆地的形成和发育主要经历了燕山、喜山两期构造运动影响。白垩纪晚期受剪切拉张作用开始断陷下沉,进入盆地演化阶段。盆地不是持续下沉,具有沉降-停止-隆升-再沉降-停止-隆升的震荡、脉动的特点,晚更新世以来具有“盆-山耦合”效应。呼和坳陷第四系及上新统发育的沉积相类型主要有半深湖相,浅湖相,滨浅湖相,滨湖相。呼和坳陷新近系上新统、第四系更新统具备生物气成藏地质条件。该区有机质丰度高,生气能力强,干酪根类型好;储层孔、渗性能优越;大面积稳定分布的芒硝层、泥质岩层是良好的区域性盖层;地层序列及岩性组合为生物气藏形成了有利的生、储、盖空间配置。通过对地层、构造、沉积相等基础地质特征的研究及第四系、上新统油气地质特征的综合分析,预测出三个有勘探利区:一是位于土右旗-大城西之间,面积约300Km2,另两个分别位于哈素-塔布赛-毕克齐和东部新营子一带,面积分别约350Km2和150Km2。
[Abstract]:Guided by petroleum geology theory, this paper makes full use of geophysical logging, seismic, gravity and magnetic data, logging, outcrop survey and experimental testing and analysis, based on the analysis of regional geological background and previous research results. By studying the basic geological characteristics of strata, sedimentation and structure, this paper focuses on the analysis of oil and gas reservoir-forming conditions and reservoir-forming mechanism of Quaternary and Upper Pliocene in Huhe depression, Hetao Basin, in order to search for traps and predict favorable zones. It is considered that Hetao basin is a Meso-Cenozoic fault basin, shallow in the north and south, with an asymmetric skip structure, and Huhe depression is the second largest sub-depression area of Hetao basin. The sedimentary strata are as follows: lower Cretaceous, Eocene, Oligocene, Miocene, Pliocene and Quaternary. The formation and development of Hetao basin mainly experienced the tectonic movement of Yanshan and Xishan. In the late Cretaceous, under shear tension, the fault depression began to sink and entered the stage of basin evolution. The basin is not continuously sinking, it has the characteristics of subsidence-stop-uplift-re-subsidence-stop-uplift and pulsation. Since the late Pleistocene, it has the effect of "basin-mountain coupling". The sedimentary facies of Quaternary and Pliocene in Huhe depression are mainly semi-deep lacustrine facies shallow lacustrine facies and lacustrine facies. The Upper Pleistocene and Quaternary Pleistocene in Huhe depression have geological conditions for biogas reservoir formation. In this area, the abundance of organic matter is high, the gas generation ability is strong, the kerogen type is good, the reservoir pore, the permeability is superior, the large area stable distribution of manganite layer, the muddy rock is a good regional caprock; Stratigraphic sequence and lithologic assemblage have formed favorable source, reservoir and cap space configuration for bio-gas reservoir. Based on the study of basic geological characteristics of stratigraphic, structural and sedimentary equivalence and comprehensive analysis of oil and gas geological characteristics of Quaternary and Pliocene, three exploration areas are predicted: one is between TuYouqi and west Dacheng, with an area of about 300km ~ 2, with an area of about 300 km ~ 2, with an area of 300 km ~ 2. The other two are located in the area of Hasou-Tabsai-Bickzi and Xinyingzi in the east, covering about 350Km2 and 150Km2, respectively.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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