Gaotai-Luo Pang Yuan Oilfield Fine Geological Research

HighTai-Luo Pang Yuan Oilfield since2008large-scale rolling development so far, atotal of Yanan formation and Yanchang Formation in drilling157wells, the Yan9reservoir,Chang4+5reservoir has a total of123production wells. In200822annual crude oilproduction well mouth,4773t, the average single well daily oil0.60t/d, composite water cut is57.1%. In2013the average daily output of132.20tons of oil, Nissan water87.56, compositewater cut is36.8%2013July, Yan9reservoir and Chang4+5reservoir well opening numberis37and33, average daily output of112.8tons and19.3tons, the average single well outputof3.04tons and0.58tons, the oil well open the proportion52.8%and47.2%, the oilproduction accounted for85.4%and14.6%.This area is in the development stage of evaluation, reserves are abundant, but thecomplex geological conditions, oil-bearing formation, vertical and horizontal heterogeneity,oil testing well ratio is small, low yield. In order to improve the oil reserves extent, to ensurethat future oil output continued to increase stability, the oil extraction rate reached a reasonablelevel, to achieve steady yield, goals, needs to develop the oilfield fine geology research.With the extension of9, long4+5formation in each layer sand ratio, permeability sandthickness of single factor of planar maps as the foundation, study was conducted onsedimentary micro facies and the distribution rule of reservoir, through the study ofheterogeneous reservoir characteristics, and "Four Relations", draws the following conclusion:long4+5formation belongs to in delta front subfacies, belongs to the low porosity and lowpermeability reservoirs, the Yan9oil-bearing delta plain subfacies, belongs to mediumporosity and low permeability reservoir; oil and gas distribution imbalance in the extreme,vertical oil and gas are mainly distributed in the long4+521and the extension from912smalllayer; planar distribution, long4+5oil reservoir is mainly concentrated in the northeast of thestudy area, Yan9reservoir is mainly concentrated in the south of the studied area; long4+5reservoir body lithological reservoir, Yan9reservoir subject to structural lithologic reservoir.