Accumulation models and numerical models of tight oil:A case study from Yanchang Formation in Ordos Basin
Online published: 2013-02-20
Tight oil can be divided into shale oil, sandwich type tight oil and adjacent source type tight oil. According to their geological characteristics and accumulation mechanism, the accumulation models were established. The result shows that: ① the shale oil accumulation process is very special, it neither experienced second migration nor primary migration, only experienced initial migration; ② sandwich type tight oil belongs to self-generation and self-accumulation, and it is the result of primary migration; ③ adjacent source type tight oil is a kind of transitional reservoirs, its migration is different from primary and second migration, and it is the driving result of “expansion force”. Based on this understanding, this paper proposed the “expanded flow” driving theory, and established adjacent source type tight oil numerical model, sandwich type tight oil numerical model based on self-generation and self-accumulation, and the volumetric method model of shale oil numerical calculation. Application example proves that this technique has a good prospect of application.
WANG Qiang , FEI Huaiyi , LIU Henian , CHENG Xubin , WU Lei , WANG Xingzhi . Accumulation models and numerical models of tight oil:A case study from Yanchang Formation in Ordos Basin[J]. Lithologic Reservoirs, 2013 , 25(1) : 4 -10 . DOI: 10.3969/j.issn.1673-8926.2013.01.002
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