鄂尔多斯盆地页岩储层孔喉连续谱分布特征--以新安边油田安83区块长7为例

Shale Oil Pore Throat Continuum Spectrum Distribution Characteristics and Its Formation Mechanism in Ordos Basin--Case in Point:Long 7 in An 83 Block of Xin'anbian Oilfield

鄂尔多斯盆地探明页岩油地质储量近15亿吨,微观孔喉分布区间决定了原油赋存状态和可动用性。本文在大量压汞实验基础上,编制从10nm-10000nm不同存储空间占比连续分布曲线,根据曲线形态组合特征,将孔喉连续分布曲线划分为三类,并与同步铸体薄片、扫描电镜样品分析结合,探讨主要分布区间对应的储集空间成因类型,划分出残余粒间孔、粒内溶孔和粘土矿物晶间孔三种主要类型。这一认识对有效动用目标和开发方式的优选具有一定的指导意义。

The proven geological reserves of shale oil in Ordos Basin are nearly 1.5 billion tons,and the microscopic pore throat distribution interval determines the crude oil reservoir state and availability.In this paper,based on a large number of mercury-pressure experiments,the continuous distribution curves of different storage space ratios from 10 nm to 10,000 nm are compiled,and the pore-throat continuous distribution curves are divided into three categories according to the combination of curve morphology characteristics,and combined with the analysis of synchronous cast thin sections and scanning electron microscope samples to explore the types of reservoir space genesis corresponding to the main distribution intervals,and to classify the residual intergranular pores,intra-grain pores and clay mineral crystal pores.The three main types of intergranular pores,intragrain solution pores and intergranular pores of clay minerals were identified.This understanding is a guide to the selection of effective utilization targets and development methods.