晚侏罗世承德盆地砾岩碎屑源区分析及构造意义   总被引：5，自引：0，他引：5  

和政军牛宝贵  张新元 《岩石学报》2007,23(3):655-666

河北承德及寿王坟盆地在晚侏罗世土城子期堆积了大量的粗碎屑沉积。砾石成分统计结果显示,承德-寿王坟盆地充填的土城子组碎屑母岩组合主要有三种,其中火山岩、花岗质岩石和变质岩组合在承德盆地占绝时优势,反映了当时盆地以北的"内蒙地轴"为主要的蚀源区。向北逆冲的双庙断裂将承德盆地分成南北两个部分,断裂两侧的砾石成分组合基本相同,显示出碎屑物质共同来源于北部,同时也暗示了该断裂在土城子期可能没有强烈的活动(强烈活动期可能在土城子组之后?)。分析表明,承德盆地南部的不对称向斜构造两侧砾石成分截然不同,说明该向斜构造控制了碎屑分布,是同沉积期形成的。该盆地南侧的碎屑供应量远远小于北侧,反映了控制盆地南缘发育的向北逆冲的灰窑断层可能是一条次要的同沉积断裂。在晚侏罗世整体向南推进的逆冲断裂系统中,灰窑断裂和双庙断裂应属于背向逆冲断层。承德盆地中大量的粗碎屑堆积与同期冲断带的耦合关系分析,指示了这一时期盆地北侧存在强烈的逆冲断裂活动。作为主要物源区,北部的"内蒙地轴"在晚侏罗世发生了强烈的隆升-剥蚀作用,推测当时在地貌上可能存在近E—W走向的古山系(或古高原?)。  相似文献   

东营凹陷深部储层井震关系研究     

张军华  胡陈康  于正军  谭明友  任雄风  赵杰  李琴 《地球物理学进展》2021,36(4):1651-1660

东营凹陷深部储层成层性较差,速度结构复杂,工区内井震关系不明确.本文首先通过地质成因分析,明确了研究区深部储层主要发育在沙四下和孔一中的"红层";通过对深部储层测井曲线的雷达图分析和交会分析,确定了SP、AC、GR、CNL、R4为东营凹陷深部储层的五种敏感测井响应;通过井震标定与地震剖面精细解释,完成了研究区井震构架的建立,明确了研究区储层符合薄互层的结构特征;在不同相带井震分析基础上,分别建立了沙四下和孔一中井震关系模板,有利于储层的定性甄别;通过定量研究多属性井震关系,得到了描述深层有利储层的最佳优势属性;最后开展基于多元线性回归和SVM的储层预测研究,找到了预测深部储层井震厚度关系的有效方法.  相似文献   

Formation mechanism and geochemical characteristics of shallow natural gas in heavy oil province,China     

Zhu  GuangYou  Zhang  ShuiChang  Zhao  WenZhi  Wang  ZhengJun  Liang  YingBo  Zhao  XueFeng  Zhang  JingYan 《中国科学:地球科学(英文版)》2008,51(1):96-106

Shallow gas reservoirs are distributed widely in Chinese heavy oil-bearing basins. At present, shallow gas resources have opened up giant potentials. The previous researches indicate the intimate genetic relationship between shallow gas and heavy oil. Shallow gas resources are generated from crude oil degraded by anaerobic microscopic organism, it belongs to biogenic gas family of secondary genesis, namely heavy oil degraded gas. Shallow gas resources are usually distributed in the upward position or the vicinity of heavy oil reservoirs. They are mainly of dry gas, which are composed of methane and only tiny C ⁺₂ heavy hydrocarbon and relatively higher contents of nitrogen gas. Generally, methane isotopes are light, whose values are between biogenic gas and thermal cracking gas. Ethane isotopes are heavy, which mixed possibly with thermogenic gas. Carbon dioxide bear the characteristics of very heavy carbon isotope, so carbon isotopic fractionation effects are very obvious on the process of microscopic organism degradation crude oil. The heavy oil degraded gas formation, a very complex geological, geochemical and microbiological geochemical process, is the result of a series of reactions of organic matter-microbes and water-hydrocarbon, which is controlled by many factors.

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Formation mechanism and geochemical characteristics of shallow natural gas in heavy oil province,China     

GuangYou Zhu  ShuiChang Zhang  WenZhi Zhao  ZhengJun Wang  YingBo Liang  XueFeng Zhao  JingYan Zhang 《中国科学D辑(英文版)》2008,51(1):96

Shallow gas reservoirs are distributed widely in Chinese heavy oil-bearing basins. At present, shallow gas resources have opened up giant potentials. The previous researches indicate the intimate genetic relationship between shallow gas and heavy oil. Shallow gas resources are generated from crude oil degraded by anaerobic microscopic organism, it belongs to biogenic gas family of secondary genesis, namely heavy oil degraded gas. Shallow gas resources are usually distributed in the upward position or the vicinity of heavy oil reservoirs. They are mainly of dry gas, which are composed of methane and only tiny C ₂ ⁺ heavy hydrocarbon and relatively higher contents of nitrogen gas. Generally, methane isotopes are light, whose values are between biogenic gas and thermal cracking gas. Ethane isotopes are heavy, which mixed possibly with thermogenic gas. Carbon dioxide bear the characteristics of very heavy carbon isotope, so carbon isotopic fractionation effects are very obvious on the process of microscopic organism degradation crude oil. The heavy oil degraded gas formation, a very complex geological, geochemical and microbiological geochemical process, is the result of a series of reactions of organic matter-microbes and water-hydrocarbon, which is controlled by many factors.  相似文献   

中东扎格罗斯盆地:沿走向变化的构造及油气特征     

刘小兵  温志新  贺正军  王兆明  李曰俊 《岩石学报》2019,35(4):1269-1278

扎格罗斯盆地是全球富含油气的前陆盆地,沿走向不同构造段的油气储量规模差别巨大,各段构造特征及其对油气富集和主控因素的认识是海外超前选区选带的重要基础。本文综合分析沿盆地走向(NW-SE向)的土耳其迪亚巴克尔段、伊拉克基尔库克段以及伊朗洛雷斯坦段、胡齐斯坦段和法尔斯段等5段的构造特征、油气成藏特征及其主控因素。结果表明:扎格罗斯盆地沿走向各段油气2P可采储量差异明显,胡齐斯坦段和基尔库克段储量规模最大,且以新近系储层为主;扎格罗斯造山作用形成一系列背斜构造、不同时期形成的蒸发盐岩盖层影响盆地各段油气聚集差异;中新世以来,随着阿拉伯板块与欧亚板块的持续碰撞,扎格罗斯盆地发生了大规模的挤压褶皱作用,下白垩统油气沿裂缝向上运移至渐新统-中新统优质储层中;基尔库克段和胡齐斯坦段新生界沉积物厚度较大,渐新统-中新统蒸发岩为优质的区域性盖层,对新生界油气的保存起重要作用;法尔斯段构造变形较为强烈,三叠系之上的上侏罗统、中新统蒸发岩受不同程度的破坏,油气主要分布于下三叠统-上二叠统碳酸盐岩。通过本研究将对中东扎格罗斯盆地的新项目评价具有一定的指导意义。  相似文献