摘要
地质法预测剩余油的关键是要建立高精度的地质模型及对油砂体动用状况的明确认识。地质知识库是建立地质模型的基础,小井距解剖建立的井下地质知识库包括岩电关系、砂体几何形态、砂体接触关系和砂体密度。依据储层建筑结构分析法建立的储层建筑结构平面和剖面模型表明,建筑结构要素的平面分布具有分带性,剖面模型则可分为4类:分流河道型、席状砂型、分流河道和河口坝型、递变型,不同模型的沉积背景及其内部的非均质性特征不同。对结构要素的吸水、产液、接触关系及注采完善性研究表明,水下分流河道砂体砂体物性好,规模较大,易于控制,剩余潜力较小;河口坝砂体虽物性好,但规模小,常有许多砂体不完善而成为剩余油富集区;重力流砂体、水下溢岸砂体则由于规模小,物性差,常成为剩余油富集区;席状砂展布广,但由于物性差,也为剩余油富集砂体。
The key of geology method to predict remaining oil is to construct geology model with high accuracy and to have a clear recognition on production degree of oil sand.This method can be generally divided into 3 steps: ①build reservoir fine geology model;②sum up production characteristics of structure elements to guide analysis of remaining oil;③analyze flow unit to define enriching area of remaining oil and its distribution rule.As the basis of geology model construction,underground geologic knowledge base built based on reservoir architecture is composed by relation of rock and electricity,sand body geometric configuration,sand body contact relation as well as sand body density.Areal model and section model of reservoir architecture constructed with analysis of reservoir architecture indicates that,plane distribution of architecture elements has the layering features.Section model can be divided into 4 types: distributary channel,sand sheet,distributary channel and mouth bar and grading types.Depositional setting for various models and interior heterogeneous feature are different.Research on water intake,produced fluid,contact relation and injection-production perfecting shows that,under the water distributary channel,sand body has characteristic of good physical property,large size,easy control and less residual oil potential;Mouth bar has fine physical property but small scale,where remaining oil enriched for numerous imperfect sand bodies;Density current sand body,subsea sand body always become the remaining oil enriching area due to small scale and poor physical property;Sand sheet is widely distributed and becomes the enriching sand body of remaining oil for its bad physical property.
出处
《大庆石油地质与开发》
CAS
CSCD
北大核心
2006年第4期42-45,共4页
Petroleum Geology & Oilfield Development in Daqing
基金
中石油青年创新基金资助项目(2002F70104)
关键词
剩余油
储层结构
地质模型
开发响应
remaining oil
reservoir structure
geology model
development response
