Distribution of carbonate cements in the Members 3 and 4of Lower Cretaceous Quantou Formation of northern SongliaoBasin and its main controling factors
Zhao Xiaoqing1，2 Bao Zhidong1，2 Meng Yuanlin3 Liu Zongfei1
1 College of Geosciences, China University of Petroleum（Beijing）, Beijing 102249; 2 State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum（Beijing）, Beijing 102249; 3 College of Geosciences, Northeast Petroleum University, Daqing 163318, Heilongjiang
Abstract：In order to study the distribution characteristics of carbonate cement and the controling factors in clastic reservoir of the Members 3 and 4 of Lower Cretaceous Quantou Formation in northern Songliao Basin. The theories of high-resolution sequence stratigraphy, and the methods of microscopically slice observation, electron microprobe analysis, fluid inclusion testing and physical properties analysis were used. The results showed that the strata of Members 3 and 4 of Quantou Formation in northern Songliao Basin were gentle, and they were buried at depths of small span, diagenesis of them was weak, and carbonate cement was mainly affected by sedimentary microfacies and cycle of base level. In the direction of provenance area to the basin, values of the content of carbonate cements in different sedimentary facies of meandering river, distributary channel and submerged distributary channel were different. At the same time, influenced by factors such as lithological character, sorting and rounding of grains, shale content, etc, the content of carbonate cement increased gradually. Values of content of carbonate cement were different in different medium cycles of the same sedimentary microfacies types of reservoir, and with the long-term base level rising, they showed a decreasing trend. The regular change of content of carbonate cement due to the difference in sedimentary environments controled by microfacies and base-level cycles is one of the important factors which influence the heterogeneity of fluvial reservoirs.
Zhao Xiaoqing,Bao Zhidong,Meng Yuanlin et al. Distribution of carbonate cements in the Members 3 and 4of Lower Cretaceous Quantou Formation of northern SongliaoBasin and its main controling factors[J]. JOPC, 2013, 15(1): 125-134.
