大庆油田未划储油层分布特征与开发前景分析

THE DISTRIBUTION AND THE POSSIBILITY OF DEVELOPMENT OF THE RESERVOIR ROCKS LOWER THAN THE CUT OFF POINT IN RESERVE ESTIMATION IN DAQING OILFIELD

本文主要阐述大庆油田以油浸、油斑泥质粉砂岩为主的未划储油层的分布特征。其含油产状厚度占全部含油产状厚度的36.6%～54.7%。含油产状呈透镜状、斑块状和条带状等,与已开发的砂岩和具有效厚度的油层呈镶边、过渡、渐变型接触,有的呈零散分布。经试油证实,自然产能达到工业油流标准,压裂后产量可提高数倍,可列入开发范围,计算石油储量。并指出,今后在确定油田开发方案时应统筹考虑;在油气勘探过程中,应列入勘探对象,对已勘探过的含油构造应重新认识,可以提供新的储量。

This paper gives a description of the distribution of those clayeg siltsto- ne bodies characterized by oil soaking,and oil stain which has not been con- sidered in reserve estimation before.Thickness of these sand bodies accounts for 36.6%～54.7% of the total thickness according to the oil occurence chara- cteristics.Their occurence is characterized by lenticular,spotted noddles and band-like…etc.in form.These sand bodies are bordering,transgressive,or gradually changing to those sand bodies developed already,and some of them is distributed scatterly.Their productivity,as proved by production test con- forms the standard of commercial production and will increase several times after hydraulic fracturing.Thus,it is suggested that these sand bodies should be trcated as those developed sand bodies and should be taken into consi- deration in further reserve estimation.This paper also points out that these sand bodies should be considered in the overall development scheme of this oil field and they should be considered as objectives in further exploration in this region.