准南霍玛吐构造带储层发育特征与油气分布的关系

Relationship between Reservoir Development and Hydrocarbon Distribution of Huomatu Tectonic Zone in Southern Junggar Fold-Thrust Belt

准南霍玛吐构造带主力产层古近系紫泥泉子组油气藏油气相态多样,油气水关系复杂,差异性明显。油气勘探与评价结果表明,储层发育的复杂性是霍玛吐构造带除复杂构造变形特征与构造样式之外控制油气成藏与分布的另一重要因素。通过研究霍玛吐构造带紫泥泉子组储层形成与演化特征,结合其油水分布规律,从储层的几何形态和内部属性两方面出发,探讨了储层发育与油气差异性分布之间的关系。研究认为:紫泥泉子组的储层空间结构类型为迷宫状,侧向相变剧烈,单砂体厚度较小,连续性中等偏差;侧向上,储层砂体的横向尖灭和物性变差常常成为油气水边界,垂向上,大套泥岩隔层可以分割上下油气水关系,形成上下不同的油水系统,造成垂向上油气水分布的复杂性。此外,综合分析对比霍玛吐构造带3个背斜的储层孔渗特征与油气充注强度差异性,认为储层物性特征与油气充注强度耦合关系是影响油气藏的油气相态与油气丰度的重要因素。

Ziniquanzi Formation of Paleocene is the main oil-bearing formation in Huomatu tectonic zone with various oil and gas phase and complex oil-gas-water relationship.Oil and gas exploration and evaluation results show that the complexity of reservoir development is another important factor except for the complex tectonic de-formation and style,which controlled the oil and gas accumulation and distribution of Huomatu tectonic zone in Southern Junggar fold-thrust belt.This paper based on the study on the reservoir development and evolution of Ziniquanzi Formation,combination with its oil-water distribution rule,the relationship between the reservoir de-velopment and oil-gas distribution would be discussed from two respects that were the reservoir geometry shapes and internal properties.It is suggested that the reservoir architecture type of Ziniquanzi Formation was labyrinth with violent facies lateral change,whose single sand body thickness was small and the lateral continuities were medium or worse.Reservoir sand bodies pinchout and properties deterioration often become oil-gas-water lateral barrier.In addition,large sets of mudstone interlayer would play a role in the segmentation of oil gas water rela-tions,and the upper and lower different oil-water systems were formed,which resulted in the complexity of ver-tical oil and gas distribution.Furthermore,the characteristics of reservoir porosity and permeability,and differ-ences of hydrocarbon filling intensity in three anticlines of Huomatu tectonic zone were analyzed and compared comprehensively.The coupling relationship between reservoir characteristics and hydrocarbon filling strength would be considered as an important factor which influenced reservoir phase and abundance.