陇东地区延长组低渗透油层局部富集区块的确定

低渗油田储层物性均质性差，在普遍低渗的背景下，有可能存在相对高渗区块，若该区块位于有利的二次油气运移方向上，则可以形成局部富集区块．作者应用这一原理，对陇东地区三造系延长组的沉积相特征、储层孔隙特征和油气二次运移方向特征及其间的相互关系进行了研究，从有利相带所确定的次生孔隙发育区块分布规律和地下流体过剩压力低值带所揭示的油气三维运移规律研究结果，认为该地区存在城华剖６井区、环县西环２０井区等局部富集区块，是油气勘探的有利区块．从而给低渗油气田勘探提供了一种新的思路．

Ascertainment of Partially Rich Oil Gathered Blocks of Low Permeability in Yanchaug Group of East Gansu Area

The physical homogeneity of low permeability reservoir is very poor,but there probably exist favourable blocks of higher permeability in the wide spreading region of low permeability.If they are in the favourable direction of oil and gas migration.they might form rich oil gathered blocks.In accordance with that theory.the authors studied the characteristics of oil and gas migration direction and their relations'Based on the distribution laws of secondary pore developing blocks and the research results of three dimensional migration laws revealed by the low pressure zone because of over fluid.it is believed that there exist rich oil gathered blocks as Pao 6 Area in Chenghua,Huan 20 Area in Huanxi.They are favourable blocks for exploration.The train of thought for the exploration of low permeability reservoir is thus provided.