濮城沙三中6-10特低渗油气藏非均质性研究

濮城沙三中油气藏属特低渗油气藏。对储层层内、层间、平面和微观非均质特性研究表明储层非均质性较强,而其非均质性受控于储层的沉积作用和成岩作用。沟道微相多为向上变差的物性分布模式,沟道间和席状砂多为向上变好的物性分布模式,其中沟道的层内非均质性最强,道间和席状砂较弱。短期旋回和中期旋回非均质参数分析表明沙三中层内和层间非均质性较强,而中期旋回较短期旋回强。层间隔层为泥岩和粉砂质泥岩,厚度变化较大,中期旋回间夹层厚度较短期旋回间夹层厚度稍大。储层砂体有两个延伸方向即北东―南西向和南东-北西向。储层的物性受控于沉积环境,高渗带与沟道相叠合,而道间和席状砂多为低渗带。孔喉资料表明其孔喉主要为微细喉,孔喉半径以小于1μm为主。

HETEROGENEITIES STUDY OF EXTRA-LOW PERMEABILITY RESERVOIR 6-10 IN THE MIDDLE SUBMEMBER OF THE THIRD MEMBER OF THE SHAHEJIE FORMATION, PUCHENG OIL FIELD

The reservoir in the middle submember of the third member of the Shahejie formation in Pucheng oil field is extra-low in porosity and permeability. The analysis of intraformational, interlayer, lateral and porosity heterogeneities indicates that the reservoir is high heterogeneous. And this study also proves that the heterogeneities are controlled by the sediment process and diagenesis. Braided channel, always becoming worse from base to top, is more strong in heterogeneities than inter-channel and sheet-li...