Cyclic Sequences and Microscopic Heterogeneity of Reservoirs in the Qigu Formation of the Fudong Slope Area

doi:10.11885/j.issn.1674-5086.2018.11.28.03

Abstract

Abstract: During the exploitation of Member 1 of the Qigu Formation in the Fudong slope area in the eastern part of the Jungar Basin, microscopic heterogeneity results in low oil and gas recovery and difficulties obtaining the residual oil. To solve these problems, this study investigated variations in the microscopic heterogeneity of (underwater) diversion channel reservoirs within cyclic sequences of different classes. Based on the sedimentary dynamics of the cyclic sequences and a stratigraphic framework with high-resolution sequences, quantitative evaluation of the heterogeneity of grains, filling materials, and reservoir pore and throat sizes was carried out mostly using mercury intrusion data of wells in the region. It is believed that the microscopic heterogeneity of the reservoirs with cyclic sequences of different classes differ. For short-term cycles, the microscopic heterogeneity of single (underwater) diversion channel reservoirs is strong at the bottom but weak at the top. For medium-term cycles, the microscopic heterogeneity of superimposed (underwater) diversion channel reservoirs is strong at the top but weak in the middle. Uplift or subsidence of cyclic sequences leads to changes in the relationships between available spaces and sediment sources. These are the main factors resulting in the differences microscopic heterogeneity of the reservoirs. And the heterogeneity of the original grains determines the heterogeneity of the reservoir pore and throat sizes.

Key words: cyclic sequence, microscopic heterogeneity, diversion channel, Qigu Formation, Fudong slope area

CLC Number:

TE122

YU Jingwei, TANG Qunying, WU Jun, LU Ziyang, WEN Huaguo. Cyclic Sequences and Microscopic Heterogeneity of Reservoirs in the Qigu Formation of the Fudong Slope Area[J]. 西南石油大学学报(自然科学版), 2020, 42(2): 37-47.

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