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油水物化性质变化可以从古水文演化角度反应油气运移方向。本文以惠民凹陷南部地区沙河街组三段为例,利用原油密度、黏度、地层水矿化度、水型及离子组合参数变化特征,研究油气运移规律。平面上,研究区原油密度、黏度整体具有西北高、东南低的分布规律,局部具有一低四高的分布特征,反映出原油密度、黏度随运移距离的增加而增大;地层水矿化度具有以夏口断裂为中心,向南北两侧逐渐变小的分布特征,矿化度高值区的分布与夏口断层油气运移聚集有关;地层水水型和离子组合参数变化特征表明沿夏口断裂带具有两个油气聚集区,分别为双丰、江家店—瓦屋鼻状构造。通过对油气运聚关系的分析,以油气源、输导因素为基础,沿油气主要运移方向,建立了研究区近源侧向砂体输导、近源混向反Z型输导、远源混向阶梯状输导、远源混向多级反Z型输导4种油气运移模式。
The changes of physicochemical properties of oil and water can reflect the direction of hydrocarbon migration from paleohydrological evolution. Taking the third member of Shahejie Formation in the southern part of Huimin Depression as an example, this paper studies the hydrocarbon migration by using the variation characteristics of crude oil density, viscosity, formation water salinity, water type and ion combination parameters. In the plane, the density and viscosity of crude oil in the study area have the distribution pattern of high northwest and low southeast, with a low and high distribution characteristic locally, reflecting the density and viscosity of crude oil increasing with the migration distance increasing. Degree has a distribution characteristic that the Xiakoukou fault is the center and becomes smaller on the north and south sides. The distribution of the high salinity value area is related to the hydrocarbon migration and accumulation in the Xiakou fault. The characteristics of formation water and ion combination parameters show that along the There are two hydrocarbon accumulation zones in the Xiakou fault zone, namely Shuangfeng and Jiangjiadian - tile house nose structures. Based on the analysis of the migration and accumulation of oil and gas, based on the source of oil and gas and the transport factors, along the main migration direction of oil and gas, the near-source lateral sandstone and near-source anti-Z- Source mixed ladder-type guide, far-source mixed multi-level anti-Z-type four kinds of migration of oil and gas migration patterns.