Quantitative study on diagenetic characteristics and pore evolution of middle-deep tight sandstone reservoirs: a case study of the Second Member of Kongdian Formation in Nanpi slope,Cangdong sag
HAN Guomeng1, LIU Yanxin2,3, WU Xuesong1, JI Youliang2,3, MOU Liangang1, YANG Peng1, DUAN Runmei1, YUAN Xuehua1, GUO Qiuxia1
1 Dagang Oilfield Exploration and Development Research Institute,Dagang Oilfield Company,CNPC,Tianjin 300280,China; 2 College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China; 3 Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, School of Earth and Space Sciences, Peking University,Beijing 100871, China
Abstract：Diagenesis plays a crucial role in shaping the evolution of reservoir physical properties and ultimately governs reservoir quality. Understanding the relative sequence of diagenesis is of utmost importance for oil and gas exploration. The diagenetic evolution of the Jurassic Yan'an Formation palaeochannel sandstone in the Jiyuan area of the 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. In addition,the impact of cements and compaction on the loss of intergranular pores was quantitatively analyzed. The results show that paleochannel sandstone reservoir of the Yan'an Formation is mainly composed of arkoses and lithic arkoses,with an average porosity of 15.1% and average permeability of 19.5×10-3μm2,classifying it as a medium-porosity and low-permeability reservoir. The diagenetic process has experienced compaction,early cementation,medium dissolution,late cementation and late replacement. Among the cements,ferrocalcite exhibits the highest content,while kaolinite is the most widely distributed cement. Cements are the main contributor to the reduction of original intergranular pore volume,accounting for an average contribution of 37.5%,while compaction was the minor contributor with an average contribution of 29.4%. In addition,calcites directly derived from diagenetic fluid related to atmospheric water,whereas dolomite originated from early calcite,coal and mudstone thermal evolution products. Ferrocalcite,on the other hand,primarily originated from thermal evolution of coal and mudstone interlayers. This study establishes a diagenetic sequence for the Jurassic Yan'an Formation palaeochannel sandstone reservoirs in the Jiyuan area,which serves as a fundamental basis for reservoir assessment and provides valuable insights for future exploration and development.
HAN Guomeng,LIU Yanxin,WU Xuesong et al. Quantitative study on diagenetic characteristics and pore evolution of middle-deep tight sandstone reservoirs: a case study of the Second Member of Kongdian Formation in Nanpi slope,Cangdong sag[J]. JOPC, 2023, 25(4): 945-958.
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