Description Of Chang-2~2 Fine Reservoir And Analysis Of The Remaining Oil In BailangCheng Oil Field In Erodos Basin

The BaiLangCheng oil field is located in the northeast of the two tectonic units’northern Shaanxi slope of Ordos Basin, its main oil producing layer is Chang-22 oil group, and its proved oil-bearing area is 16.87 km2 and proved oil reserves is 1181.6 × 104 t, the oil field has entered the stage of water flooding development.According to the the low yield,high watercut,low oil utilization,imperfect flooding pattern and many other issues. This paper based on a large number of geological, logging, analysis and testing and oil field development dynamic data,Chang 22 of the main production layer in the area, studied sedimentary characteristics and sand body distribution, reservoir characteristics and reservoir heterogeneity, reservoir geologic features,analyzed the distribution of remaining oil in the region, and for the the remaining oil distribution and oil field development situation, proposed the development adjustment measures. The main recognize achievements are:1. There is a a NE-SW trending normal fault between zuan 167 well and zuan 8 well in the south of the area.2. By lithology, regional stratigraphic division signs and other data divided Chang-22 section of the research area into three segments mayor,and the Chang-22 section of main producing formation is subdivided into five small layers.3. The Chang-22 sedimentary facies is mainly delta plain,micro-phase is branches of river and shunt between depression. With the cast thin analysis, scanning electron microscopy and high-pressure mercury experiments, long sandstone reservoir 22 for the hole-fine throat, low-permeability reservoirs. The reservoir sand body continuity is relatively good, effective thickness of sand body is relatively large areas along the river channel development area banded distribution. Bai Lang Cheng reservoir is weak heterogeneity-Homogeneous.4. Reservoir type is lithologic-structural reservoir. Oil distributed by lithology, properties and low amplitude structure control. Effective traps was formed by the control of lithology shade and nasal structure, and effective thickness is thicker, oil saturation is higher in the high-order bit of the structure.5. The plane of remaining oil is concentrated in the area of central and northern regions,the longitudinal direction of remaining oil is mainly enriched in the upper reservoir. Aiming at the related issues, proposed some measures,such as deployment of new wells, injection adjustment, perforating and fracturing and so on.