致密砂岩储层埋藏-成岩-油气充注演化过程与孔隙演化定量分析——以鄂尔多斯盆地东部上古生界盒8段天然气储层为例

doi:10.11743/ogg20160610

Abstract

Abstract: Current researches about the evolution process of diagenesis-porosity,the burial-thermal history,and the hydrocarbon charging history of tight sandstone reservoirs are still in a static stage in China.Apparently,less attention has been paid to the relevance between hydrocarbon charging and tightening process caused by the petrological components of sandstones and its differential diagenetic evolution process.In order to better understanding the dynamic evolution history of burial-diagenesis-hydrocarbon charging-porosity of tight sandstone,samples from the 8^th Member of Xiashihezi Formation (He8) of the Upper Paleozoic in eastern Ordos Basin were studied in detail through the identification and quantitative statistics of cast sections,together with various analysis methods such as SEM,CL,homogenization temperature and chemical composition of fluid inclusions etc.Furthermore,the differences of the timing of densification process and hydrocarbon charging among different sandstone layers were discussed.The results indicate that the diagenesis-hydrocarbon charging evolution processes of both the calcium-cemented sandstone and high plastic lithic sandstone are relatively simple.The former became tightened after carbonate cementation in the stage A of middle diagenesis phase,which confirms that hydrocarbon charging was early than tightening; while the latter became tightened after compaction in the early diagenetic stage,which confirms that tightening occurred before hydrocarbon charging.In contrast,the quartz sandstone and lithic quartz sandstone are complicated in diagenetic-charging evolution process and their tighenging and hydrocarbon charging synchronous.

Key words: sandstone type, diagenetic sequence, quantitative porosity evolution, tight sandstone, Ordos Basin

CLC Number:

TE122.1

Li Miao, Hou Yundong, Luo Jinglan, Chen Juanping, Luo Xiaorong, Jia Yani. Burial,diagenesis, hydrocarbon charging evolution process and quantitative analysis of porosity evolution: A case study from He 8 tight sand gas reservoir of the Upper Paleozoic in Eastern Ordos Basin[J]. Oil & Gas Geology, 2016, 37(6): 882-892.

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Burial,diagenesis, hydrocarbon charging evolution process and quantitative analysis of porosity evolution: A case study from He 8 tight sand gas reservoir of the Upper Paleozoic in Eastern Ordos Basin

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