基于储层构型理论的致密砂岩成藏过程分析——以松辽盆地古龙向斜葡萄花油层为例

doi:10.11743/ogg20180206

Abstract

Abstract: Tight sandstone reservoir is highly heterogeneous and its hydrocarbon accumulation process is complicated.The petrologic features,physical properties,pore throat structures and diagenesis of the Putaohua oil reservoir in Gulong syncline,Songliao Basin,were studied via a combination of core,thin section,SEM and experimental data.Then the spatio-temporal coupling relationship between the tightening history and hydrocarbon accumulation history of tight sandstone reservoir was analyzed based on the hierarchical system of architecture theory and the identification of genetic units.Results indicate that (1) hierarchically the Putaohua oil reservoir is composed of 8 lithofacies units,1 subfacies unit,and 4 microfacies units in terms of genesis;(2) the reservoir sandstone is mainly feldspar lithic sandstone with fine-grain size,medium sorting and rounding,mostly calcite cement filling,an average porosity of 7.63% and an average permeability 0.42×10^-3 μm².The majority of the pores are intergranular dissolution pores,developing shrinkage,fracture,and curved-plate throats;(3) the Putaohua oil reservoir is currently in Period A of the anadiagenetic stage after two periods of cementation and one period of dissolution during the diagenetic evolutionary history;(4) the oil enrichment of the Putaohua reservoir is attributed to the dynamic evolutionary process of multiphase accumulation and selective charging.And we come to the conclusion that microfacies of the underwater channel,thick sheet sandstone,and the interconnected thin sheet sandstone close to the above two areas are high-quality hydrocarbon-enriched reservoirs in the syncline.

Key words: accumulation process analysis, reservoir architecture theory, tight sandstone, Putaohua oil reservoir, Gulong syncline, Songliao Basin

CLC Number:

TE122.2

Liu Fang, Liu Xingquan, Liu Zongbao, Guan Xianli, Zhang Yunfeng, Liu Yunyan. Hydrocarbon accumulation analysis of tight sandstone based on reservoir architecture theory-A case from Putaohua reservoir in the Gulong syncline,Songliao Basin[J]. Oil & Gas Geology, 2018, 39(2): 268-278.

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Hydrocarbon accumulation analysis of tight sandstone based on reservoir architecture theory-A case from Putaohua reservoir in the Gulong syncline,Songliao Basin

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