Reservoir Characteristics and Sensitivity Evaluation of Chang 23 in N Area of Xifeng Oilfield

doi:10.7657/XJPG20200304

Abstract

Abstract:

Based on the analysis oF physical property testing, cast thin sections, scanning electron microscope and high pressure mercury intrusion for the Chang 2₃ low-permeability sandstone reservoir in N area of Xifeng oilfield, the paper describes the characteristics of the reservoir, classifies the reservoir according to petrologic features, physical properties and pore throat characteristics, evaluates the reservoir sensitivities and analyzes their influencing factors. The study results show that the Chang 2₃ reservoir in the N area of Xifeng oilfield is dominated by fine-grained feldspar lithic sandstone. The pore types are mainly intergranular pores and feldspar dissolved pores. The average porosity and permeability of the reservoir are 16.4% and 13.5 mD, respectively, which indicates the reservoir belongs to medium—low porosity, low permeability reservoirs. The reservoir can be divided into three types: the physical property and pore throat structure of Type Ⅰ reservoir are the best, and those of Type Ⅱ and Type Ⅲ reservoirs become worse and worse. The reservoir in the study area is featured with moderate-weak velocity sensitivity, weak water sensitivity, moderate-weak salt sensitivity, moderate acid sensitivity, strong alkali sensitivity and moderate-strong pressure sensitivity. The sensitivities of the reservoir in the study area are influenced by clay minerals, partial clastic grains and pore throat structures. The velocity sensitivity of the reservoir is mainly related to kaolinite content, and water and salt sensitivities related to illite content and occurrence. The acid sensitivity is influenced by both chlorite and ferrodolomite contents, strong alkali sensitivity results from high contents of feldspar and quartz and pressure sensitivity is the result of the deformation of pore throats. The clay content, pore throat structure, physical property and sensitivity of the three types of reservoir are different. During the process of oilfield development, reservoir protection should be carried out according to the sensitivity controls and the differences of sensitivity of different reservoirs, so as to reduce the damage to reservoir.

Key words: Ordos basin, Xifeng oilfield, Yanchang formation, reservoir, sensitivity, physical property, pore throat structure, main controlling factor

CLC Number:

TE112.23

HE Hui, LI Junjian, QI Zhao, XU Zhongyi, LIU Meirong, ZHU Yushuang. Reservoir Characteristics and Sensitivity Evaluation of Chang 2₃ in N Area of Xifeng Oilfield[J]. Xinjiang Petroleum Geology, 2020, 41(3): 278-287.

Figures/Tables 17

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Reservoir Characteristics and Sensitivity Evaluation of Chang 2₃ in N Area of Xifeng Oilfield

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