南襄盆地南阳凹陷烃源岩再认识与资源潜力

doi:10.11743/ogg20120308

Abstract

Abstract:

Kerogens of source rocks in the Nanyang depression of Nanxiang Basin are dominated by type Ⅱ₁ and type Ⅱ₂,and the organic types of the middle and lower Member Ⅱ of Hetaoyuan Formation (HF) are better than that of the Member Ⅲ of HF.The organic matters of the Member Ⅱ of HF are mainly sourced from bacteria and lower plants,while that of the Member Ⅲ of HF from plants.The organic matter abundance of the source rocks of HF are different for different sub-members.The richest one is the lower Member Ⅱ,followed by the upper Member Ⅲ.The organic matter abundance of the middle Member Ⅲ is moderate just like the middle Member Ⅲ.The upper Member Ⅱ is the lowest.The distribution area of active source rocks gradually becomes smaller upwards,and the source rocks concentrated in deep depression to the south.The resources in place by this reassessment are 104 million tons,much larger than 62 million tons by the last assessment.The resources of the middle Member Ⅲ are the largest,accounting for 37.5% of the total resources, followed by the upper Member Ⅲ,the lower and middle Member Ⅱ.The resources of the Member Ⅲ account for 59.6% of the total resources,indicating that the Member Ⅲ is the main source rocks of the Nanyang depression.However, the resource exploration maturity for the depression is quite low,indicating that the exploration potential for the depression may be large.

Key words: source rock, resource in place, Hetaoyuan Formation, Nanyang depression, Nanxiang Basin

CLC Number:

TE122.1

Lü Mingjiu. Re-evaluation of source rocks and petroleum resources of Nanyang depression in Nanxiang Basin[J]. Oil & Gas Geology, 2012, 33(3): 392-398.

References

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Re-evaluation of source rocks and petroleum resources of Nanyang depression in Nanxiang Basin

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