绥靖油田延长组长2储层流体识别方法

Fluid Identifi cation Method of Extension Group 2 Reservoir in Suijing Oilfi eld

绥靖油田延长组属于低孔、低渗复杂致密砂岩储层,低孔低渗致密砂岩储层常常会出现低阻油层,低阻油层的成因机理研究随着非常规油气田的勘探开发而备受关注,本论文针对研究区长2段电阻率明显偏低的现象,从孔隙结构、构造圈闭幅度等方面展开研究,对目标地层低阻油层成因进行探讨。本轮研究在深入分析长2段低阻油层成因的基础上,根据绥靖油田延长组长2储层的物性特征,将孔隙度和束缚水饱和度的关系拟合曲线,得出了束缚水饱和度计算公式,采用束缚水饱和度与含水饱和度重叠法,对研究区长2段储层进行流体性质识别。在此基础上,还建立了双孔隙度重叠法,可以有效、快速对延长组长2段储层进行流体性质识别。

The Yanchang Formation of Suijing Oilfield belongs to the complex tight sandstone reservoir with low porosity and low permeabili-ty.The low resistivity oil layer often appears in the tight sandstone reservoir with low porosity and low permeability.The research on the genetic mech-anism of the low resistivity oil layer has attracted much attention with the exploration and development of unconventional oil and gas fields.In this paper,the resistivity of the Chang 2 member in the study area is obviously low.The research is carried out from the aspects of pore structure and struc-tural trap amplitude,and the genesis of the low resistivity oil layer in the target formation is discussed.On the basis of in-depth analysis of the causes of low-resistivity oil layers in the Chang 2 member,according to the physical characteristics of the Chang 2 reservoir in the Yanchang Formation of the Suijing Oilfield,the relationship between porosity and bound water saturation is fitted to the curve,and the calculation formula of bound water satu-ration is obtained.The bound water saturation and water saturation overlap method is used to identify the fluid properties of the Chang 2 reservoir in the study area.On this basis,a dual porosity overlap method is also established,which can effectively and quickly identify the fluid properties of the Chang 2 reservoir of Yanchang Formation.