The Research Of Reservoir In Zizhou Oilfiele Hejiaji Area

Ordos basin Zizhou oilfield Hejiaji area is a Western-leaning monoclinic structures, angle lessthan1°, gradient8~10m/km. Nose-like uplifts is developed. Oilfield drilling strata from top tobottom is Quaternary, Upper Triassic Yanchang group. The main oil-bearing series is Chang6formation and Chang4+5formation. The Main Ingredients of reservoir is mid-fine sandstone andfine sandstone, reservoir physical property is poor, heterogeneity is strong.Under the guidance of the basic theories of sedimentary petrology, reservoir geology and so on,make full use of core, drilling, logging, well logging, and various related analysis assay data, on thebasis of previous studies to determine the distribution of depositional system and distributioncharacteristics of Zizhou oilfield Hejiaji area Triassic Yanchang group; Through the study ofreservoir macro features and microstructure, summarizes the Reservoir petrology characteristicsand diagenesis types, analysis of the diagenetic evolution, summarizes the reservoir space types,analysis of characteristics of reservoir pore structure and physical properties; At the same time, thecomprehensive classification evaluation of reservoirs in the study area, and summarizes the reservoircharacteristics; Finally, based on known key effective reservoir anatomy, analysis of effectivereservoir distribution and controlling factors, and to effectively predict reservoir distribution.This paper applies sedimentology, reservoir geology, sequence stratigraphy and othermulti-disciplinary theory. From the perspective of the sedimentary facies and sedimentaryenvironment, make full use of peripheral field outcrop data, on the basis of contrast to adjacentareas, combining modern testing technology and methods, make clear sand body distribution,reservoir characteristics, the comprehensive evaluation of reservoir, optimizing the favorablearea for the development of reservoir. Not only can enrich formation mechanism theory ofcontinental stratum high-quality reservoir, the oil field exploration deployment and favorableexploration targets of the choice also has practical guiding significance.