断—砂配置对油气运移与聚集的控制作用

发布时间：2018-04-16 09:29

本文选题：断-砂配置 + 油气运移　；参考：《东北石油大学》2015年硕士论文

【摘要】：本文从断裂和砂体两个方面双管齐下,在研究其各自对油气运移和聚集的控制作用的基础上,对断-砂配置对油气的运移与聚集的控制作用进行了研究。在研究过程中考虑油气运移方向的影响,将断-砂配置对油气运移与聚集的影响分为侧向运移和垂向运移两种情况并对其各自运移和聚集油气条件及特征进行了研究。分别以南堡凹陷和杏北地区为实例,对垂向运移条件下和侧向运移条件下,断-砂配置运移和聚集油气过程及要素进行了分析。侧向运移条件下,断-砂配置输导油气分为阶梯状输导和沿断层走向断-砂输导脊运移(或断层内部构造脊)两种情况。在杏北地区,西南斜坡区和中央背斜带属于阶梯状运移,西北斜坡区为断层走向上断-砂高效输导脊运移。阶梯状输导油气条件为区域性盖层以及物性好、连通性好的砂体。沿断层走向断-砂输导脊运移油气所需条件为：断裂走向与地层倾向一致,沿断裂走向方向砂体连通性好,物性好；沿断裂走向具有流体运移的流体势梯度(或断裂带内部发育构造脊)；砂体上方直接盖层断接厚度大于其阈值。断-砂侧向输导能力主要与砂岩的厚度、砂岩倾角和砂岩泥质含量相关,其计算公式为：T=H·sinθ·(1-Rm)。侧向运移条件下,在运移路径上存在遮挡条件是断-砂配置聚集油气的重要条件,最有利于油气聚集的断-砂配置类型为d1。对杏北地区西南斜坡区油气聚集规律研究发现：(1)油气在反向断层下盘比在顺向断层上盘更为富集；(2)断层规模较大时,油气仅在一盘聚集,断层规模较小时,油气在断层两盘均有聚集。(3)垂向上油气富集层位发生上调,浅层成藏。对垂向运移条件下,南堡凹陷断-砂配置运移油气过程研究发现：油源断裂和区域性盖层是其垂向运移油气的前提条件；高砂地比砂层组、物性好的单砂体以及有利的断-砂配置类型是油气沿断裂侧向分流的条件。断-砂配置垂向输导油气能力主要与砂体厚度、断层倾角、砂体倾角、断-砂接触长度和泥质含量相关,其计算公式为：垂向运移条件下,断-砂聚集油气的条件是在断裂两盘存在有利圈闭。其聚集富集油气规律为：(1)区域盖层厚度决定了油气在盖层上下分布情况；(2)高砂地比决定了油气侧向分流的具体层位；(3)断-砂配置类型决定了圈闭的具体类型和油气分布的具体部位。
[Abstract]:In this paper, based on the study of the controlling effect of fault and sand body on hydrocarbon migration and accumulation, the control effect of fault-sand configuration on oil and gas migration and accumulation is studied.Considering the influence of hydrocarbon migration direction, the influence of fault-sand configuration on oil and gas migration and accumulation is divided into two situations: lateral migration and vertical migration, and their respective migration and accumulation conditions and characteristics are studied.Taking Nanpu Sag and Xingbei area as examples, the oil and gas migration and accumulation process of fault-sand configuration under vertical and lateral migration conditions are analyzed.On the condition of lateral migration, the distribution of oil and gas in fault-sand distribution can be divided into two types: staircase migration and migration along fault-sand transport ridge (or internal tectonic ridge of fault).In Xingbei area, the southwest slope and central anticline belong to ladder migration, and the northwest slope is fault strike upfault-sand transport ridge migration.The ladder oil and gas transport conditions are regional caprocks and sand bodies with good physical properties and good connectivity.The conditions for migration of oil and gas along fault strike and sand transport ridge are as follows: the fault strike is consistent with the stratigraphic tendency, the sand body is well connected and the physical property is good along the direction of the fault strike;The fluid potential gradient with fluid migration along the fault strike (or tectonic ridge developed within the fault zone), and the fracture thickness of the direct caprock above the sand body is greater than its threshold value.The lateral transport capacity of fault-sand is mainly related to the thickness of sandstone, the angle of sandstone inclination and the content of sandstone clay. The formula is: Th sin 胃 ~ (1-Rm) ~ (-1).Under lateral migration conditions, the occlusion condition in migration path is an important condition for accumulation of oil and gas in fault-sand configuration, and the type of fault-sand configuration that is most favorable for oil and gas accumulation is D1.The oil and gas accumulation in the southwest slope of Xingbei area is studied. It is found that when the oil and gas concentration in the downplane of the reverse fault is greater than that in the upper face of the forward fault, the oil and gas only accumulates in one section and the scale of the fault is small.Oil and gas accumulates on both sides of the fault.On the condition of vertical migration, it is found that the oil source fault and regional caprock are the prerequisite for vertical migration of oil and gas, and the formation of sand bed with high sand ratio.Single sand body with good physical properties and favorable fault-sand configuration are the conditions for lateral distribution of oil and gas along the fault.The vertical oil and gas transport capacity of fault-sand configuration is mainly related to the thickness of sand body, fault dip angle, sand body dip angle, contact length of fault-sand and muddy content. The formulas are as follows: vertical migration condition.The condition of accumulation of oil and gas by fault-sand is that there are favorable traps on the two sides of the fault.The law of accumulation and enrichment of oil and gas is that the thickness of the caprock layer determines the distribution of oil and gas in the upper and lower caprocks.) the ratio of sand to ground determines the specific horizon of oil and gas distribution in the lateral direction.) the type of fault-sand configuration determines the specific type of trap and oil.The specific part of the gas distribution.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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