Abstract Bioturbation is well developed in the reservoir of the Neogene Sanya Formation in the northern Qiongdongnan Basin. Based on detailed observations of cores,quantitative characterization and connectivity analysis of the microscopic pores of reservoir rock samples with and without bioturbation were carried out using polarized light microscopy,scanning electron microscopy and micro-CT. The reservoir modification effect reflected by the Ophiomorpha-Thalassinoides ichnofabric was studied in detail. The results show that the Ophiomorpha-Thalassinoides ichnofabric in the Neogene Sanya Formation is well developed in northern Qiongdongnan Basin. The burrows obviously modified the initial sedimentary structure of the reservoirs,and the primary sedimentary bedding was destroyed. The burrows are mainly filled with quartz,feldspar,chlorite and a small amount of clay minerals. Many intergranular pores and a small amount of intra-grain dissolution pores developed,while the mud content of the surrounding rocks is high,and the pores were poorly developed. Quantitative analysis shows that the morphological characteristics of the pores and pore throats are consistent. The pore volume,pore area, equivalent radius of pore and throat area all present left-skewed unimodal distribution,while the equivalent radius of throat and throat length show approximate bimodal distribution. The number of large pores and throats,effective porosity,permeability and average coordination number of samples with bioturbation are significantly greater than those of samples without bioturbation. This reveals that the Ophiomorpha-Thalassinoides ichnofabric enhances the reserve capacity and connectivity of microscopic pores in the Sanya Formation reservoir. This study is of great significance for analyzing the modification effect of bioturbation on oil and gas reservoirs,increasing reserve capcity, production and recovery of oil and gas in the study area.
Fund:National Natural Science Foundation of China(No.41472104,42272178),the Program for Innovative Research Team(in Science and Technology)in Universities of Henan Province,China(Grant No.21IRTSTHN007),and the Program for Innovative Research Team(in Science and Technology)of Henan Polytechnic University(Grant No. T2020-4)
About author: NIU Yongbin,born in 1980,is a professor with a doctoral degree. He is engaged in researches on applied ichnology and sedimentology. E-mail: niuyongbin@hpu.edu.cn.
Cite this article:
NIU Yongbin,CHENG Mengyuan,CHENG Yigao et al. Reservoir modification effect of Ophiomorpha-Thalassinoides ichnofabric in the Neogene Sanya Formation in northern Qiongdongnan Basin[J]. JOPC, 2023, 25(6): 1407-1420.
NIU Yongbin,CHENG Mengyuan,CHENG Yigao et al. Reservoir modification effect of Ophiomorpha-Thalassinoides ichnofabric in the Neogene Sanya Formation in northern Qiongdongnan Basin[J]. JOPC, 2023, 25(6): 1407-1420.
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