塔北隆起中西部新近纪末构造应力场数值模拟

塔北隆起是塔里木盆地油气勘探开发最成功的地区之一,前人在构造变形特征、发育演化和形成的地球动力学机制等方面已经取得了较为明确的认识,并对中新生代负反转构造的形成机制做了深入研究[1-6],但对本区各个时期的构造应力场研究却只限于简要描述,缺乏直接的证据和定量的分析  

塔里木盆地塔北隆起西部圈闭类型、分布及空间组合规律

围绕塔北西部碳酸盐岩和碎屑岩这两大类勘探目标,采用"成因分类法"将塔北西部已经发现的圈闭划分为4大类8亚类.在此基础上,对不同圈闭类型分布的主要层位及平面展布特征做了分析.划分了4个圈闭形成期,并分析了在不同构造演化阶段,构造运动和沉积环境对不同圈闭类型的控制作用.归纳了塔北西部圈闭的空间组合规律.  

塔北隆起三叠系储层评价及储盖组合

三叠系地层为塔北隆起主要目的层系之一 ,油气主要分布于轮南断垒、桑塔木断垒及解放渠—吉拉克地区 .通过常规分析 ,分析、总结了塔北隆起三叠系储层沉积特征、成岩特征、物性特征及孔喉结构特征及储盖组合特征 ,在此基础上对储层进行评价 ,得出储层分布主要受沉积相带的控制的结论  

塔北隆起羊塔克构造带油气成藏分析

羊塔克构造带位于塔北隆起的西端 ,属于库车油气系统的前缘隆起带。邻区的油气勘探结果显示 ,早期属塔北隆起、后期属库车前陆盆地前缘张性隆起构造带的羊塔克、牙哈、玉东及英买 7等构造带具有陆相 (前渊凹陷的三叠侏罗系源岩 )和海相 (被动边缘的寒武奥陶系源岩 )双重油气来源 ,并具有上部碎屑岩 (构造 )和下部碳酸盐岩 (潜山 )含油气的特点。据推测 ,羊塔克构造带除已发现的白垩系下第三系构造油气藏外 ,尚有相应层系的地层油气藏和下部碳酸盐岩 (潜山 )油气聚集 ,具有一定的勘探前景。  

塔北隆起中西部新近纪末构造应力场数值模拟

根据油田地震资料解释和构造分析,建立了新近纪末塔北隆起中西部平面与剖面地质模型,通过线弹性有限元方法的计算,得出该地区应力场模拟结果。构造应力场模拟结果表明,区域性南北向挤压应力控制了整个塔北隆起中西部新近纪末的构造应力场;研究区内牙哈断裂、轮台断裂、红旗断裂、英买7断裂在新近纪末为压扭性断裂,并具有左行走滑分量,喀拉玉尔滚断裂为右行走滑断裂,羊塔克断裂为纯压性逆冲构造;在区域挤压应力作用下,受主干断裂影响形成的局部构造应力场控制了局部次级构造类型的产生;从剖面应力场模拟结果来看,最大主应力方向在中央断隆区由水平变为倾斜,垂向应力分量变大,是导致压拱构造形成的主要因素。  

Accumulation process and model for the Ordovician buried hill reservoir in the western Lunnan area, the Tarim Basin

The Ordovician buried hill reservoir in the western Lunnan area, a type of dissolved fracture and cavernous reservoir, is mainly composed of heavy oil. The oil is the mixture sourcing from the Middle-Lower Cambrian and Middle-Lower Ordovician, with three stages of pool forming process： （1） the destruction and parallel migration/accumulation during the late Caledonian to early Hercynian; （2） the oil and gas accumulation during the late Hercynian characterized by adjustment upward along faults and parallel migration/accumulation; （3） the formation of heavy oil during the latest Hercynian. The Ordovician buried hill reservoir is affected by the diffusion of light oil and gas but had no hydrocarbon charging during the late Yanshan period to Himalayan period, but in this period, formed the association of heavy oil and dissolved gas cracked from crude oil with dry coefficient of 0.91-0.96. The study on accumulation process of the Ordovician buried hill reservoir has important implications for the exploration potential of early oil and gas accumulation in the cratonic area of the Tarim Basin.  

塔北隆起侏罗系层序划分及沉积、储层特征

侏罗系储层为塔北隆起重要储层之一.储层分布主要受沉积环境的控制.塔北隆起侏罗系地层可划分为两个层序——层序1(JSQ1)、层序2(JSQ2).两个层序均由低位体系域、水进体系域、高位体系域组成.地层沉积环境主要为辫状三角洲、氧化宽浅湖泊环境.侏罗系地层为一套辫状三角洲—湖泊—河流相沉积,自下而上构成4个油组.储集砂体主要为辫状三角洲的分流河道、水下分流河道沉积,次为滨、浅湖沙滩沉积.水下分流河道砂体以中—粗砂岩为主,砾岩含量高,原生粒间孔发育,次生孔隙亦发育,储集性能好;滨、浅湖砂坝以粉砂岩、细砂岩为主,原生粒间孔不发育,次生溶孔亦不发育,储集性能差.垂向上,JⅣ油组优于JⅠ、JⅡ、JⅢ油组,JⅠ、JⅡ、JⅢ三个油组的储集性能相近;平面上,优质储层分布于辫状三角洲前缘亚相的水下分流河道中,相对较好的Ⅱ类储层分布于哈拉哈塘凹陷的HA4井区;Ⅲ类储集层分布于南喀—英买力、轮南低凸起、库尔勒鼻隆;Ⅳ类差储层分布于轮台断隆.  

Accumulation process and model for the Ordovician buried hill reservoir in the western Lunnan area,the Tarim Basin

The Ordovician buried hill reservoir in the western Lunnan area, a type of dissolved fracture and cavernous reservoir, is mainly composed of heavy oil. The oil is the mixture sourcing from the Middle-Lower Cambrian and Middle-Lower Ordovician, with three stages of pool forming process: (1) the destruction and parallel migration/accumulation during the late Caledonian to early Hercynian; (2) the oil and gas accumulation during the late Hercynian characterized by adjustment upward along faults and parallel migration/accumulation; (3) the formation of heavy oil during the latest Hercynian. The Ordovician buried hill reservoir is affected by the diffusion of light oil and gas but had no hydrocarbon charging during the late Yanshan period to Himalayan period, but in this period, formed the association of heavy oil and dissolved gas cracked from crude oil with dry coefficient of 0.91-0.96. The study on accumulation process of the Ordovician buried hill reservoir has important implications for the exploration potential of early oil and gas accumulation in the cratonic area of the Tarim Basin.