Genesis of Low-Resistivity Reservoirs in Sangonghe Formation，Mahu Sag

doi:10.7657/XJPG20230204

Abstract

Abstract:

The widespread low-resistivity oil reservoirs in the Jurassic Sangonghe formation on the southern slope of the Mahu sag in the Junggar basin are difficult to identify due to their complex formation mechanisms and unclear oil-water contacts. According to the geological characteristics of these reservoirs, and combined with the data from laboratory analysis, formation test, production test and logging, the genesis of the low-resistivity reservoirs were systematically analyzed. The results show that the reservoirs in the second member of Sangonghe formation (San-2 member) in the study area contain mainly tuff debris and have microfractures and micropores resulted from compaction and dissolution, leading to complex pore structure and high irreducible water saturation. High irreducible water saturation and high formation water salinity are the main geneses of the low-resistivity of the reservoirs in the Sangonghe formation. The reservoir rocks are fine-grained, mainly composed of fine sandstone and siltstone, and contain clay minerals dominated by kaolinite and illite/smectite, which are the secondary genetic factors of low-resistivity reservoirs. The research results have been applied satisfactorily in the identification of reservoirs in the study area, providing a certain theoretical basis for evaluating low-resistivity reservoirs of the Sangonghe formation in the Mahu sag.

Key words: Junggar basin, Mahu sag, Sangonghe formation, low-resistivity reservoir, formation water salinity, irreducible water saturation, tuff debris

CLC Number:

TE112.22

QI Yuan, HAN Dongwei, DU Yinyu, ZHOU Weijun. Genesis of Low-Resistivity Reservoirs in Sangonghe Formation，Mahu Sag[J]. Xinjiang Petroleum Geology, 2023, 44(2): 151-160.

Figures/Tables 13

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Table 4.

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