Oil And Gas Reservoir And Traps

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Oil and Gas Reservoir and Traps Since the mass of oil and gas are less than the rocks, the oil and gas formed in the deep source rock always migrate upwards, trying to reach the surface and seeps out into land or water. After the oil and gas formed in the source rock, the pressure applied on the rock tried to squeeze out the oil out of rock and move upwards, they could travel along any pathways such as open faults and fractures. Therefore, eventually oil and gas stop travelling and reserved in what we call an oil trap, where we explore and exploit the accumulated oil and gas. The reason that a trap could hold the oil and gas in the rocks in the certain depth is each trap has a layer of impermeable rock as a cap rock on the top of the trap, keeping the oil and gas just under the trap and prohibiting their upward migration. The necessary conditions to form a reservoir include an impervious cap rock and a porous reservoir rock and a closure occurs in all directions to prevent leakage of oil and gas. The Gulf of Mexico is a mud-dominated basin, which leads to the formation of various traps in this complex environment with diverse depositional and structural architectures. The most significant types of traps in Gulf of Mexico include: Anticline, Fault trap, Salt Dome and Stratigraphic trap. [6] The attached Figure 4 shows the difference among the four types of traps. (Fig.4) (A) Anticline: Anticline traps are the most common traps in Gulf of Mexico area, even in the world. In
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