A New Methodology to Determine the Reasonable Buildup Test Time for Tight Oil Wells: A Case Study From the Ordos Basin

2018 ◽  
Author(s):  
Hongyang Chu ◽  
Xinwei Liao ◽  
Shenghua Wang ◽  
Lijia Yuan ◽  
Zhou Yuan ◽  
...  
Keyword(s):  
Ordos Basin ◽  
Oil Wells ◽  
Test Time ◽  
Tight Oil ◽  
The Ordos Basin

scholarly journals Analysis of tight oil accumulation conditions and prediction of sweet spots in Ordos Basin: A case study

2021 ◽  
Author(s):  
Ying Tang ◽  
Shihao Tan ◽  
Ruifei Wang ◽  
Hao Wang ◽  
Chunming Xia ◽  
...  
Keyword(s):  
Ordos Basin ◽  
Tight Oil ◽  
Oil Accumulation ◽  
Sweet Spots

scholarly journals Analysis of the charging process of the lacustrine tight oil reservoir in the Triassic Chang 6 Member in the southwest Ordos Basin, China

2017 ◽  
Vol 54 (12) ◽  
pp. 1228-1247
Author(s):  
Zhengjian Xu ◽  
Luofu Liu ◽  
Tieguan Wang ◽  
Kangjun Wu ◽  
Wenchao Dou ◽  
...  
Keyword(s):  
Ordos Basin ◽  
Source Rocks ◽  
Driving Mechanism ◽  
Tight Oil ◽  
Geological Time ◽  
Tight Sandstone ◽  
Main Production ◽  
The Ordos Basin ◽  
Homogenization Temperatures ◽  
Quartz Grains

With the success of Bakken tight oil (tight sandstone oil and shale oil) and Eagle Ford tight oil in North America, tight oil has become a research focus in petroleum geology. In China, tight oil reservoirs are predominantly distributed in lacustrine basins. The Triassic Chang 6 Member is the main production layer of tight oil in the Ordos Basin, in which the episodes, timing, and drive of tight oil charging have been analyzed through the petrography, fluorescence microspectrometry, microthermometry, and trapping pressure simulations of fluid inclusions in the reservoir beds. Several conclusions have been reached in this paper. First, aqueous inclusions with five peaks of homogenization temperatures and oil inclusions with three peaks of homogenization temperatures occurred in the Chang 6 reservoir beds. The oil inclusions are mostly distributed in fractures that cut across and occur within the quartz grains, in the quartz overgrowth and calcite cements, and the fractures that occur within the feldspar grains, with blue–green, green, and yellow–green fluorescence colours. Second, the peak wavelength, Q650/500, and QF535 of the fluorescence microspectrometry indicate three charging episodes of tight oil with different oil maturities. The charging timings (141–136, 126–118, and 112–103 Ma) have been ascertained by projecting the homogenization temperatures of aqueous inclusions onto the geological time axis. Third, excess-pressure differences up to 10 MPa between the Chang 7 source rocks and the Chang 6 reservoir beds were the main driving mechanism supporting the process of nonbuoyancy migration.

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