, source rock refers to rocks from which hydrocarbons have been generated or are capable of being generated. They form one of the necessary elements of a working petroleum system. They are organic-rich sediments that may have been deposited in a variety of environments
including deep water marine, lacustrine
and deltaic
. Oil shale
can be regarded as an organic-rich but immature source rock from which little or no oil has been generated and expelled.
Source rocks are classified from the types of kerogen
that they contain, which in turn governs the type of hydrocarbons that will be generated.
- Type 1 source rocks are formed from algal remains deposited under anoxicHypoxia (environmental)Hypoxia, or oxygen depletion, is a phenomenon that occurs in aquatic environments as dissolved oxygen becomes reduced in concentration to a point where it becomes detrimental to aquatic organisms living in the system...
conditions in deep lakes: they tend to generate waxy crude oils when submitted to thermal stress during deep burial - Type 2 source rocks are formed from marine planktonic and bacterial remains preserved under anoxic conditions in marine environments: they produce both oil and gas when thermally cracked during deep burial.
- Type 3 source rocks are formed from terrestrial plant material that has been decomposed by bacteriaBacteriaBacteria are a large domain of prokaryotic microorganisms. Typically a few micrometres in length, bacteria have a wide range of shapes, ranging from spheres to rods and spirals...
and fungi under oxic or sub-oxic conditions: they tend to generate mostly gas with associated light oils when thermally cracked during deep burial.
It may be necessary to use methods other than constitutional ones.
Our votes must go together with our guns. After all, any vote we shall have, shall have been the product of the gun. The gun which produces the vote should remain its security officer – its guarantor. The people's votes and the people's guns are always inseparable twins.
We are still exchanging blows with the British government. They are using gay gangsters. Each time I pass through London, the gangster regime of Blair
What we hate is not the color of their skins but the evil that emanates from them.
Our party must continue to strike fear in the heart of the white man, our real enemy!
The white man is not indigenous to Africa. Africa is for Africans. Zimbabwe is for Zimbabweans.
We have fought for our land, we have fought for our sovereignty, small as we are we have won our independence and we are prepared to shed our blood…. So, Blair keep your England, and let me keep my Zimbabwe.
Let Blair and the British government take note and listen. Zimbabwe is for Zimbabweans. Our people are overjoyed, the land is ours. We are now the rulers and owners of Zimbabwe.