Analysis of sedimentary-diagenetic evolution difference on middle-deep buried sandstone reservoirs under overpressure background: a case study of the Miocene Huangliu Formation in Yinggehai Basin,South China Sea
Mao Qian-Ru1, Fan Cai-Wei2, Luo Jing-Lan1, Cao Jiang-Jun1, You Li2, Fu Yong1, Li Shan-Shan2, Shi Xiao-Fan1, Wu Shi-Jiu2
1 State Key Laboratory of Continental Dynamics,Northwest University,Xi'an 710069,China; 2 Zhanjiang Branch of CNOOC Ltd.,Guangdong Zhanjiang 524057,China
Abstract：Overpressured formation is widely developed in Yinggehai Basin. Dongfang and Ledong areas are in the heart of favorable gas accumulation in Yinggehai Basin. The Dongfang area is located in the center of the diapiric zone where the overpressure background formed relatively earlier(9~5 Ma)and the main provenance came from the Kuntum Uplift in the west. The Ledong area is situated in the Yingdong Slope where the overpressure ocurred relatively later(5~2 Ma),and its main provenance was from Hainan Uplift in the east. The comparative analysis of petrology and physical properties,hydrocarbon filling,and diagenetic characteristics of overpressured sandstone reservoirs of Miocene Huangliu Formation in Dongfang and Ledong areas are conducted,based on identification of thin sections under microscope,measurement of fluorescence of hydrocarbon-bearing thin sections and fluid inclusions,scanning electron microscope,electron probe,homogenization temperature of fluid inclusions,X-ray diffraction of clay minerals,etc. The result shows that: (1)Compaction and cementation of the Huangliu Formation in the Dongfang area are relatively weak,which resulted in relatively well physical properties(av. porosity is 17.68% and av. permeability is 11.11×10-3 μm2)and corresponds to the late mesodiagenetic A. However,the Huangliu Formation in Ledong area is characterized by relatively strong compaction and cementation and lead to poor physical properties(av. porosity is 8.94% and av. permeability is 1.52×10-3 μm2),corresponding to the diagenetic stage of the mesodiagenetic B. (2)The reservoir physical properties are mainly controlled by the sedimentation,overpressure and the diagenesis. The diagenetic characteristics and diagenetic-pore evolution of reservoirs are jointly affected by the provenance,depositional and subsidence centers,sedimentary facies,the timing of overpressure occurring and the scale of hydrocarbon filling. (3)To some degree,overpressure can minimize the compaction strength,inhibite the cementation and in turn,promote the dissolution.
Mao Qian-Ru,Fan Cai-Wei,Luo Jing-Lan et al. Analysis of sedimentary-diagenetic evolution difference on middle-deep buried sandstone reservoirs under overpressure background: a case study of the Miocene Huangliu Formation in Yinggehai Basin,South China Sea[J]. JOPC, 2022, 24(2): 344-360.
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