Evaluation on Sensitivity Difference Between Chang 4+5 and Chang 6 Reservoirs in Mahuangshan Area of Jiyuan Oilfield

doi:10.7657/XJPG20220506

Abstract

Abstract:

In order to avoid sensitivity damage and improve oil recovery, the sensitivity difference between Chang 4+5 and Chang 6 reservoirs in Mahuangshan area of Jiyuan oilfield was studied. Based on the analysis of petrology, physical properties and pore-throat structures of the reservoirs in the study area, sensitivity experiments were carried out with cores, then the sensitivities of Chang 4+5 and Chang 6 reservoirs in the study area were evaluated, and the causes for the sensitivity differences between Chang 4+5 and Chang 6 reservoirs were analyzed. The results show that the Chang 4+5 and Chang 6 reservoirs are dominated by lithic feldspar sandstone, and have the average porosity of 10.6% and 9.4%, the average permeability of 0.65 mD and 0.25 mD, and the average surface porosity of 6.84% and 3.67%, respectively. The Chang 4+5 and Chang 6 reservoirs are generally characterized by weak velocity sensitivity, weak water sensitivity, weak slat sensitivity, strong acid sensitivity and strong alkali sensitivity. The Chang 4+5 reservoir exhibits stronger alkali sensitivity and water sensitivity than the Chang 6 reservoir, for its high content of feldspar and quartz and low content of kaolinite, while the Chang 6 reservoir has stronger salt sensitivity and acid sensitivity than the Chang 4+5 reservoir, for its high content of clay minerals. In the subsequent reservoir stimulation, the pH value of the injected fluid to formation should be strictly controlled.

Key words: Ordos basin, Jiyuan oilfield, Mahuangshan area, Yanchang formation, reservoir, sensitivity, reservoir protection

CLC Number:

TE112.23

SONG Yuchun, HUANG Hao, ZHOU Chuangfei, KE Xianqi, TANG Haodi, ZHU Yushuang. Evaluation on Sensitivity Difference Between Chang 4+5 and Chang 6 Reservoirs in Mahuangshan Area of Jiyuan Oilfield[J]. Xinjiang Petroleum Geology, 2022, 43(5): 546-553.

Figures/Tables 12

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