There should be the presence of a prolific source rock with sufficient organic matter in an anoxic environment to generate the hydrocarbons. Standard geochemical analysis like TOC and pyrolysis are carried out on the source rocks to determine their organic matter content and thermal maturity. Once that is established, there should be the presence of a reservoir rock with suitable porosity to hold the migrating hydrocarbons and permeability to help transmit the fluids. Most reservoirs are of sandstone or carbonates. The reservoir rock should have traps; accommodative spaces for the hydrocarbons. They can either be structural or stratigraphic or a combination of both. Significant traps yield economic accumulations of oil and gas. Also, there should be a cap or seal rock to prevent the fluids from escaping from the petroleum system. All these elements and processes come together to form a good petroleum system in a sedimentary basin.

I know, but usually nobody tells you these things for free:

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Regards,

Laszlo

I have gained some new understanding of the generation mechanisms of coal, oil, and natural gas. Specifically, when it comes to the formation of oil and gas reservoirs in sedimentary basins, they can be divided into two situations: locally generated or externally generated. The effect of geological activity on oil and gas storage locations changes, which is the most important mechanism for the formation of oil and gas reservoirs. The limited historical periods of geological sites are the main generation periods of oil and gas reservoirs, and the ability of sedimentary basins to form oil and gas reservoirs through slow organic matter deposition is very limited!

我对煤炭、石油、天然气的生成机制有了一些新的认知，具体到沉积盆地形成油气藏，分成两种情况，本地生成或者外来，地址活动对油气的作用使其存储位置发生变化，这是最主要的一种成油气藏的机制，有限的几个地址历史时期是油气藏的主要生成时期，沉积盆地通过缓慢有机质沉积形成的油气藏的能力非常有限！