Oil & Gas Geology ›› 1990, Vol. 11 ›› Issue (2): 187-194.doi: 10.11743/ogg19900207

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DIAGENESIS OF OLIGOCENE SHA-3 (3) SUBMEMBER IN MACHANG REGION,DONGPU DEPRESSION AND ITS RELATION TO HYDROCARBON

Shou Jianfeng, Yuan Zhengwen   

  1. Zhongyuan Oilfield
  • Received:1989-04-17 Revised:1989-09-15 Online:1990-06-25 Published:2012-01-16

Abstract:

The Oligocene Sha-3 (3) submember in Machang region,Dongpu Depression is a large progressive deltaic deposit.It mainly underwent component-dissolution and dissolved-precipitation during the process of burial diagenesis.The first dissolution oc-curred prior to the peak period of hydrocarbon generation,and the dissolved pores areavailable spaces for hydrocarbon accumulation;the second dissolution happened after thepeak period and prior to the formation of cracking gas,the pores formed may have consid-erable significance for gas accumulation in deep and superdeep strata.