Comprehensive Analysis of Logging and Excavation Effects in Carbonate Reservoirs

doi:10.11885/j.issn.1674-5086.2020.06.26.01

Abstract

Abstract: Due to the large structural changes and complex lithology, there are many contradictions in fluid identification and fluid interface division of carbonate reservoir in H Oilfield. For gas identification, compensated neutron logging mining effect is effective in some blocks, but not in others. Therefore, it is necessary to analyze the influencing factors of mining effect. Firstly, the lithology and pore structure characteristics of carbonate reservoir in H Oilfield are analyzed. Then the physical characteristics of Layer KA and KB such as pore permeability are analyzed. The response characteristics of mining effects formed by neutron logging and density logging in gas reservoirs are summarized by those curves of several Wells, and the reasons of forming true and false mining effects are analyzed. The density log and neutron log correlation was expounded in theory, and two kinds of logging response correlation equation were deduced. The factors affecting the mechanism of the excavation effect were analyzed from the borehole diameter expanding permeability, pore structure, physical property and saturation. Finally, the comprehensive utilization of mining effect judgment analysis method of gas was suggested and the excavation effect of judge true and false of a few basis was put forward. The fluid identification of K Reservoir in H Oilfield is well completed with this method. Therefore, this method can provide reference for the accurate identification of fluid types in H Oilfield and similar complex carbonate reservoirs.

Key words: H Oilfield, carbonate reservoir, logging evaluation, gas zone identification, excavation effect

CLC Number:

TE132

WANG Weijun, LIU Hongqi, ZHU Guangya, XIN Jionglong, WANG Youjing. Comprehensive Analysis of Logging and Excavation Effects in Carbonate Reservoirs[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2023, 45(1): 43-54.

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