渤海湾盆地廊固凹陷烃源岩特征及其发育模式

doi:10.11743/ogg20140305

Abstract

Abstract:

Rock-Eval data,carbon and oxygen isotopes and molecular geochemical parameters of the source rocks in Es⁴(the 4^th member of Paleogene Shahejie Fm)-the lower Es³(the 3^rd member of Paleogene Shahejie Fm)in Langgu Sag were integrated to study the formation mechanism of lacustrine source rocks with low abundance under different tectonic and climatic conditions.Rock pyrolysis and kerogens' maceral composition analysis revealed that the Es⁴ and the lower Es³ are the similar in the major kerogen type of Ⅱ,but are quite different in organic matter abundance.Based on analyses of carbon and oxygen isotopes in the context of regional tectonic and palaeo-climate settings,we established depositional models for the source rocks in Es⁴-lower Es³.The source rock in the Es⁴ was deposited in a lake basin at the initial stage of rifting,with low width/depth ratio,arid climate,and brackish water or saline water with stable salinity stratification.Its ¹³C-depleted of the inorganic and organic matter and lower Pr/Ph might reflect relatively low primary productivity and better organic preservation.In contrast,the source rock in the lower Es³ was deposited in a lake basin in the intense rifting stage,with a high width/depth ratio,warm and humid climate,fresh water,and frequent water-column overturning with unstable temperature stratification.Its ¹³C enrichment of the inorganic and organic matter and C₂₇/C₂₉ sterane ratios were interpreted to be caused by higher primary productivity and more terrigenous organic matter input.

Key words: carbon isotope, oxygen isotope, biomarker, depositional model, lacustrine source rock, Langgu Sag, Bohai Bay Basin

CLC Number:

TE122.1

Diao Fan, Zou Huayao, Hao Fang, Jin Fengming, Sun Yehua, Luo Qing, Shi Yulei, Liang Xiaojuan. Characteristics and depositional models of source rocks in Langgu Sag,Bohai Bay Basin[J]. Oil & Gas Geology, 2014, 35(3): 326-335.

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Characteristics and depositional models of source rocks in Langgu Sag,Bohai Bay Basin

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