江汉盆地西南缘二次生烃及其对油气成藏的影响

doi:10.11743/ogg20060418

Abstract

Abstract:

Hydrocarbon enrichment varies dramatically in such structural belts as Xie Fengqiao,Fu Xingchang,and Caixue in the southwestern margin of Jianghan basin.The extent of hydrocarbon enrichment is found to be related to the uplift and erosion processes in the Late Eogene and the potentiality of secondary hydrocarbon generation.Evidences,such as the late mature of source rocks,crude with the same source but different maturities,and the fluid-inclusion anaysis,all suggest a possibility of secondary hydrocarbon generation in the study area.The oil reservoirs that were formed before the rise of basin were partly or entirely destroyed with the rise of the basin,structures that could capture the secondary hydrocarbon generation have relatively high hydrocarbon enrichment.Xie Fengqiao structure had captured and preserved the primary and secondary hydrocarbons, thus its enrichment level is the highest.Caixue and Fu Xingchang belts suffered from great loss of their primary hydrocarbons in the process of rise of the basin.However,Caixue belt has a higher enrichment of hydrocarbons for having received a supply of second hydrocarbon generation,while Fu Xingchang,without the process of secondary hydrocarbon generation,has a lower oil saturation and poor enrichment of hydrocarbons.

Key words: maturity of source rocks, fluid inclusion, secondary hydrocarbon generation, burial history, Jianghan Basin

CLC Number:

TE112.322

Chenbo, Han Dingkun, Luo Mingxia, Yanliang. Researches on secondary hydrocarbon generation in Southwest of Jianghan Basin and its effects on hydrocarbon accumulations[J]. Oil & Gas Geology, 2006, 27(4): 557-562,570.

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Researches on secondary hydrocarbon generation in Southwest of Jianghan Basin and its effects on hydrocarbon accumulations

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