Abstract：The dolomite reservoir of the Lower Cambrian Xiaoerblak Formation in Tarim Basin is mainly controlled by sedimentary facies,in which the mounds and shoals are the potential zone of reservoir. Therefore,it is of great significance to clarify the characteristics and laws of mounds and shoals for oil exploration in this field. The Xiaoerblak area is selected as the study region and,7 geological profiles are measured in outcrops. Based on the description of the field outcrops and observation on many thin slices,the sedimentary characteristics of the Xiaoerblak Formation are systematically analyzed and the sedimentary facies model is established. The Xiaoerblak Formation in the study area is 158-178 m in thickness. It mainly contains microbiological dolomites,arenite dolomite and granule dolomite. The microbiological dolomites are divided into laminite dolomite,thrombolite dolomite,spongiostromatastromatolite dolomite,stromatolite dolomite,and oncolites dolomite. The lithofacies combination indicates that the Xiaoerblak Formation comprises one 3rd succession that is characterized as upward shallower trend. These rocks combination show that Keping area is a carbonate ramp with “microbial mat-mound and shoal-tidal flat” sedimentary system in the depositional period of Xiaoerblak Formation. From the Wensu ancient uplift to the basin,it develops inner ramp,middle ramp and outer ramp in turn. In middle ramp,the medium-high energy mounds and shoals are distributed,with a thickness of 70-85 m and the ratio of shoals to the whole strata is up to 44%-51%. It is confirmed again that the Xiaoerblak Formation in Tarim Basin has a great potential of oil exploration.
Zheng Jian-Feng,Yuan Wen-Fang,Huang Li-Li et al. Sedimentary facies model and its exploration significance of the Lower Cambrian Xiaoerblak Formation in Xiaoerblak area, Tarim Basin[J]. JOPC, 2019, 21(4): 589-602.
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