辽河坳陷辽中凹陷成岩作用与中深层孔隙演化

doi:10.11743/ogg20070309

Abstract

Abstract:

A detailed analysis based on test data of thin rock section,X-ray diffraction,geochemistry,etc.,is carried out on the diagenesis of Liaozhong sag in Liaohe depression and pore evolution in its middle-and deep-strata.Five diagenetic stages are classified according to the analysis.They are A and B stages of early diagenesis,and A,B,and C stages of late diagenesis.A study on the evolution characteristics and forming mechanism of the secondary pores and their relationships with diagenesis reveals that two main secondary pore zones in middle-and deep-strata are formed mainly by the rapid evolution of clay minerals,hydrocarbon generation,and overpressure,and correspond respectively to the B stage of the early diagenesis and the A stage of late diagenesis.It is concluded that the secondary pore zones in middle-and deep-strata of overpressured areas in Liaozhong sag are the potential exploration targets for the future.

Key words: diagenesis, secondary pore, mechanism, middle-deep strata, Liaozhong sag, Liaohe depression

CLC Number:

TE122.2

Jiang Shu, Cai Dongsheng, Zhu Xiaomin, Zhu Guanghui, Hu Xiaolin. Diagenesis of Liaozhong sag in Liaohe depression and pore evolutionin its middle-deep strata[J]. Oil & Gas Geology, 2007, 28(3): 362-369.

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Diagenesis of Liaozhong sag in Liaohe depression and pore evolutionin its middle-deep strata

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