Diagenetic evolution and sources of main cements within palaeochannel sandstone reservoirs of the Jurassic Yan'an Formation in Jiyuan area,Ordos Basin
YANG Shangfeng1, BAO Zhidong2, SHEN Yanwei3, GAO Yinshan3, LIN Yanbo3, ZHU Lihua1, CHEN Xiaohong4, DING Sheng1, ZHU Bohua1, QI Qing1, LI Fei1
1 Sinopec Geophysical Research Institute Co.,Ltd., Nanjing 211103,China; 2 College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China; 3 The Fifth Oil Production Plant of PetroChina Changqing Oilfield Company, Xi'an 710200,China; 4 College of Geophysics,China University of Petroleum(Beijing),Beijing 102249,China
Abstract：Diagenesis directly affects the evolution of reservoir physical properties,and further controls reservoir quality. It is of great significance for oil and gas exploration to clarify the relative sequence of diagenesis. The diagenetic evolution of Jurassic Yan'an Formation palaeochannel sandstone in Jiyuan area of Ordos Basin and its main sources of cements were studied based on core observation,common thin sections,cast(stained)thin sections,scanning electron microscopy(SEM),cathodoluminescence(CL),X-ray diffraction,fluid inclusion and carbon & oxygen isotopes. Also the impact of cements and compaction on the loss of intergranular pores was quantitatively analyzed. The results show that paleochannel sandstone reservoir of Yan'an Formation is mainly composed of arkoses and lithic arkoses,with average porosity of 15.1% and average permeability of 19.5×10-3 μm2,which belongs to medium-porosity and low-permeability reservoir. The diagenetic process has experienced compaction,early cementation,medium dissolution,late cementation and late replacement. As far as the cements are concerned,the content of ferrocalcite is the highest,and kaolinite is the most widely distributed. Cements are the main contributor to the reduction of original intergranular pore volume,with an average contribution of 37.5%,and compaction was the minor contributor,with an average contribution of 29.4%. In addition,calcites directly derived from diagenetic fluid related to atmospheric water;dolomite was a joint source of early calcite,coal and mudstone thermal evolution products,but ferrocalcite primarily originated from thermal evolution of coal and mudstone interlayer. This study establishes a diagenetic sequence of Jurassic Yan'an Formation palaeochannel sandstone reservoirs in Jiyuan area,which is able to provide a foundation for reservoir assessment for further exploration and development.
YANG Shangfeng,BAO Zhidong,SHEN Yanwei et al. Diagenetic evolution and sources of main cements within palaeochannel sandstone reservoirs of the Jurassic Yan'an Formation in Jiyuan area,Ordos Basin[J]. JOPC, 2023, 25(4): 906-919.
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