Development characteristics and orientation of tight oil and gas in China
SUN Longde,ZOU Caineng,JIA Ailin,WEI Yunsheng,ZHU Rukai,WU Songtao,GUO Zhi
Table 2 Tight gas accumulation elements in a craton basin.
Reservoir type Typical formation Source rock Reservoir Cap rock Structure type Types of
reservoirs formed		 Trap type Gas-water
relationship		 Reservoir
forming
characteristics
Effective filling type
(Central Sulige)		 8th Member of Lower Shihezi
Formation-1st
Member of
Permian Shanxi Formation		 Carboniferous-Permian coal, with hydrocarbon generation intensity of (16-28)×108 m3/km2, and 24×108m3/km2
on average		 8th Member of Lower Shihezi Formation,
fluvial quartz sandstone of Shanxi
Formation		 Shale of Upper Shihezi Formation Slope of craton basin Source rock
below
reservoir,
source-and-
reservoir
in one		 Litho-
logic
trap		 Gas reservoir with distribution boundary
controlled by lithology, and gas saturation
of greater than 60%.		 Source and reservoir interbedded,
near source accumulation,
large scaled reservoir forming
Insufficient filling
(Western Sulige)		 8th Member of
Lowe Shihezi
Formation-1st
Member of
Permian Shanxi Formation		 Carboniferous-Permian coal, with hydrocarbon generation intensity of (10-18)×108 m3/km2, and 14×108 m3/km2
on average		 8th Member of Lower Shihezi Formation,
fluvial quartz sandstone of Shanxi
Formation		 Shale of Upper Shihezi Formation Slope of craton basin Source rock
below
reservoir,
source-and-
reservoir
in one		 Litho-
logic
trap		 With no obvious gas-water
contact but a gas-water
transition zone		 Source and reservoir interbedded,
connect by micro fracture,
near source
accumulation,
large scale reservoir forming