Turkish Journal of Earth Sciences




Microbial mound is favorable carbonate reservoir for petroleum exploration, especially for the deep tight reservoirs in the Tarim petroliferous basin. Due to lack of effective research methods, it is difficult to analyze its unique sedimentary structure and evolution process. In this study, based on cores, thin-sections, logging, 3D seismic data and geochemical test data, the petrographic texture, microfacies, geometry and growth phases of microbial mound in Gucheng area, Southeastern Tarim Basin were investigated, which can be used to reconstruct dynamic evolution of the microbial mounds and discuss the controlling factors. The major results are as follows: (1) Gucheng area is located in the margin facies belt of a relatively high-energy platform, which was conducive to the growth and development of microbial mounds. Seven petrographic textures were identified, forming four sedimentary microfacies types, namely mound base, mound core, mound flat and mound wing. (2) In the Middle and Upper Cambrian, there were four phases of microbial mound sedimentary, which were successively superimposed in the ocean-ward direction. The development area was more than 1400 km2, with stripped distribution from south to north in the plane. (3) The four phases of microbial mound complexes reflect the gradual evolution process of carbonate platform from low angle slope to platform margin in regional sea level regression environment. The microfacies geometry and growth phases of microbial mounds were mainly controlled by sea level change and palaeo-geomorphology.


Microbial mound, geometry, growth phases, sea level regression, Southeastern Tarim Basin

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