| The under karamay formation in the H6 wellblock is a suite of alluvial fan deposits.Although the sand body is thick,it changes fast at the vertical and lateral direction and have the complete consecutiveness.Reservoir heterogeneity is better and oil deposit has the complex structure,and meanwhile,it's dominated by some faults,causing the obscure acquaintance of the distribution characteristics of oil layer in the plane and section and the ambiguity of the reason for the controlling oil-water distribution.In addition,the coring data and oil testing data are limited which bring a huge challenge to clarify the distribution characteristics of oil layer.This paper researches on the comprehensive geology of the oil deposit of the under karamay formation by stratigraphic division and correlation,well-logging interpretation and evaluation,sedimentary facies study,reservoir heterogeneity,geological modeling and reservoir comprehensive assessment,detailedly describing the distribution characteristics of oil layer in the plane and section and three-dimensional space.And this paper makes out the character of the oil-water distribution and the controlling factors and the distribution of the reservoir property parameter,to predicts the advantageous area combining with the distribution of the advantageous area in space by fuzzy mathematics discriminant method.The research shows that the under karamay formation in the H6 wellblock is structural-lithologic heavy oil reservoir.The oil-water distribution is controlled by the tectonics and lithology and the oil distributes mainly tectonics high-order bit and sandy conglomerate sheltered by faults without the same oil-water interface.At the vertical direction,the layer S61 has the characteristic of the thick sand body,better consecutiveness,good reservoir physical property and oiliness and it is the main reservoir stratum.At the plane,the favourable reservoir distributes in the northwest. |
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