Characteristics of Iron-bearing Carbonate Cements and Its Impact on Tight Sandstone Reservoirs in the Jurassic of the Taibei Sag

doi:10.11885/j.issn.1674-5086.2024.04.29.01

Abstract

Abstract: The clastic rocks in the Middle-Lower Jurassic coal strata measures are important target for oil and gas exploration and development in Taibei Sag, Turpan-Hami Basin. Iron-bearing carbonate minerals are wildly distributed and the reservoir heterogeneity is strong. In addition, there are significant differences of oil and gas accumulation in different areas. Using various analysis testing. We make a systematic study on the carbonate minerals and paragenetic mineral in the reservoirs and clarify the main causes of reservoir heterogeneity. The study shows that the pores are filled by carbonate minerals to different extent, leading to the decrease of reservoir porosity and the enhancement of heterogeneity reservoir. The mineral assemblage and distribution are affected by the thickness, grain size and composition of sandstone related to sedimentation. The sandstone grain size of underwater distributary channel of braided river in Qiudong Depression is thick, coarse with complex debris and matrix content is poor. The sandstone of underwater distributary channel of braided river in Shengbei Depression is of thin-thickness, of fine grains with high content of plastic debris and matrix. Complex clastic components and high matrix content in sandstone lay the material foundation for the formation of iron-bearing carbonate minerals. The rock texture and quantity of organic matter in sediments determine the diagenetic evolutionary path of reservoirs in different intervals, and further lead to the spatial and temporal disparities of the mineral assemblage associated with iron carbonates.

Key words: Taibei Sag, Jurassic, iron-bearing carbonate, tight sandstone reservoir, Sangonghe Formation, Xishanyao Formation

CLC Number:

TE122

LIN Tong, ZHAO Zhenyu, WU Chao, ZHANG Hua. Characteristics of Iron-bearing Carbonate Cements and Its Impact on Tight Sandstone Reservoirs in the Jurassic of the Taibei Sag[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2025, 47(2): 32-49.

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