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Accumulation Characteristics of Tight Sandstone Oil below Source Rocks and Its Major Controlling Factors: Fuyu Oil Layer in Da'an Area in Songliao Basin, NE China
Author(s) -
SUN Yu,
DENG Ming,
XIANG Yao,
MA Shizhong,
YAN Baiquan,
ZHANG Jinyan
Publication year - 2015
Publication title -
acta geologica sinica ‐ english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 61
eISSN - 1755-6724
pISSN - 1000-9515
DOI - 10.1111/1755-6724.12304_24
Subject(s) - geology , structural basin , source rock , layer (electronics) , china , geochemistry , petrology , petroleum engineering , geomorphology , materials science , composite material , geography , archaeology
Tight sandstone oil generally refers to the oil accumulated in tight sandstone reservoir rocks, with insitu permeability less than 0.1×10μm (or surface permeability lower than 1×10μm). Under normal conditions, there is no oil natural capacity in the well, or natural capacity is lower than the threshold of industrial capacity. But under special economic and technical conditions, it can reach to the industrial capacity (Jia et al., 2012; Hu, 2013). Tight sandstone oil has become the most realistic highlight field in unconventional hydrocarbon exploration and development in the world (Pollastro R M et al., 2008; Zou et al., 2012). Many petroliferous basins of china have favourable geological conditions for the occurring of tight sandstone oil. And it shows a great resource potential (Zou et al., 2013). However, the research results mainly focus on tight sandstone gas in the world, including hydrocarbon accumulation conditions, hydrocarbon accumulation pattern and distribution characteristics (Holditch S A, 2006). There are few studies on tight sandstone oil, and there is scope to go much further. Da'an area is located in low slope in the southern Da'an sag of Songliao basin, NE China. Fuyu oil layer is the fourth section of Lower Cretaceous Quantou Formation. The major reservoir sandbody of Fuyu oil layer is the channel sandbody.It is distributed widespread from NW to SE, and Its porosity and permeability are generally low (most of the porosity less than 10%, most of the permeability less than 1×10μm), which can be ascribed into three reasons: First, the deep burial depth; Second, the very strong diagenesis of rocks; Third, the high shale content and plastic debris content in sandstone. Exploration practice shows that Fuyu oil layer of Da'an area is rich in oil resources(Sun et al., 2009). However, the tight sandstone oil accumulation and distribution controlling factors are still unclear.