准噶尔盆地哈山东部地区侏罗系骨架砂体展布特征及连通性研究

骨架砂体是油气输导体系的组成要素之一，但其内油气分布常受到砂体内部断层封堵能力与砂体非均质性的影响.在明确区域地层格架与沉积相的基础上，对哈拉阿拉特山东部地区侏罗系八道湾组及三工河组内发育的骨架砂体进行了展布特征与连通性研究.通过对研究区砂体宽厚比分析，认为骨架砂体单井厚度在30 m以上时，其在井间可以彼此接触.建立区域连井剖面，发现八道湾组一段、三段及三工河组三段3套骨架砂体规模较大，展布范围广.八道湾组一段作为研究区侏罗系油气分布的主要层段，其内断层产状以及断层成岩封闭作用的差异，是造成油气在骨架砂体内差异性分布的主要原因.该段骨架砂体渗透率与孔隙度整体变化趋势基本一致，但存在较为明显的东西分区性，中部交接区孔渗性差，油气平面分布与微观非均质性有明显的相关关系，证明骨架砂体的物性特征也是影响其输导运移油气能力的关键因素.

DISTRIBUTION AND CONNECTIVITY OF THE JURASSIC SKELETAL SAND BODIES IN THE EAST OF HALA'ALATE MOUNTAIN,JUNGGAR BASIN

Skeletal sand body is one of the components of petroleum transportation system, in which the distribution of oil and gas is commonly affected by the sealing capacity of faults and the heterogeneity of sand. On the basis of regional stratigraphic framework and sedimentary facies, this paper studies the distribution and connectivity of the skeletal sand bodies in Jurassic Badaowan and Sangonghe formations. Analysis of the width-thickness ratio of sand body in the study area reveals that, when sand thickness in single well is above 30 m, the sand is considered as being connected between the wells. The regional connecting-well sections shows that the sand bodies in J₁b₁, J₁b₃ and J₁s₂ strata are large in size, with good connection. As the major Jurassic reservoir layer in the area, the differences of fault occurrences and sealing properties in the J₁b₁ is the main reason for the variability of oil-gas distribution. The variation tendency of permeability in J₁b₁ sand is consistent with that of porosity, but there is an obvious partition between the west and the east. The central junction zone has poor porosity. There is a good correlational dependence between the planar distribution of petroleum and the variation of micro-physical properties. This also proves that the micro-physical properties of sand body can affect the connection.